The mechanism of knowledge-based behavior of pastoralists for rangeland management: exploitation, restoration and conservation

Pastoralists have managed their lands for a thousand years, but they are ignored in the land management approaches. They have comprehensive information about their rangelands, coming from extensive observations and experiences in continuous herding. This research has focused on revealing the mechanism of knowledge-based behavior of pastoralists for rangeland management. The statistical population is made up of 50 pastoralists, all of whom were included in census. The research instrument was a researcher-made questionnaire that measured the knowledge-based behavior of pastoralists with 58 items in three indicators i.e. exploitation, conservation, and restoration. The validity and reliability of the research instrument were assessed using the opinions of local experts and Cronbach's alpha (α = 0.877). The knowledge-based behavior of pastoralists were from the highest to the lowest related to exploitation, conservation, and restoration with the average of 2.35, 2.07 and 1.58 respectively. Exploitation knowledge, restoration knowledge and conservation knowledge had the strongest and weakest significant relationship with the knowledge-based behavior of pastoralists. “The adequate growth of palatable plants is a sign of the start of grazing” and “the soil should not be wet for the start of grazing” had the highest importance for rangeland exploitation with a values of 0.816 and 0.784 respectively. For rangeland conservation, “holding meetings by elders regarding rangeland conservation is useful” and “reducing the number of pastoralists during droughts is one of the rangeland conservation ways” were the most importance items with the values of 0.852 and 0.848 respectively. For rangeland restoration, “implementation of grazing systems (rotation or rest rotation grazing systems) is one of the rangeland restoration ways” and “the appropriate distribution of watering points is one of the rangeland restoration factors” were the most importance items with the values of 0.840 and 0.812 respectively. There was a positive and significant relationship between the age, history of pastoralism and income with the knowledge-based behavior of pastoralists in rangeland management. Therefore, the presented approach based on indigenous knowledge can be considered as an effective component for rangeland management and can strengthen the positive effects of both management systems and create a transformation in the status of natural resources by a compatible combination of indigenous knowledge and modern knowledge. It is worth noting that by knowing these indicators, we can take an effective step in planning and policy making as well as proper management of rangelands.

www.nature.com/scientificreports/ is a special type of animal husbandry in arid and semi-arid regions, which is based on herding, mobility and opportunistic grazing of natural vegetation 4 .It is estimated that pastoralism is practiced by 50-500 million people worldwide 5,6 .There is no complete and accurate information about the origins of pastoralism, but it can be traced back to about 10,000 years ago in Zagros Mountains, Iran 7 .
Iran has long been a suitable platform for animal husbandry due to its special climatic and geographical conditions.With about 85 million hectares, rangelands are estimated to occupy 51.5% of the Iran's land area.Pastoralism is practiced by about 2 million people in Iran, supplying more than 25% of the country' meat consumption.Pastoralists have gathered a vast information and knowledge about the environment, livestock and their grazing resources through extensive observation and repeated trials and errors, resulted from historic and continuous presence in rangelands 8 .The indigenous knowledge of pastoralists is essential for their natural resources management 9 .This knowledge has a significant impact on their management strategies and exploitation of natural ecosystem 10 .The indigenous knowledge of pastoralists and its documentation can play an important role for rangeland conservation and management 11,12 .Local pastoralists often have different perceptions about rangelands degradation 13 .The reinvestigation of rangeland health indicators based on the indigenous knowledge of pastoralists can be of great help in planning and policy making for sustainable management of rangelands 14 .The indigenous knowledge of pastoralists and scientific knowledge can be combined in sustainable management systems to reduce the degradation of rangelands.Despite the precious environmental knowledge of pastoralists, they are always ignored in policies and plans related to rangelands by governmental agencies 15 .The governmental top-down management based on formal knowledge and ignoring the pastoralists' knowledge and views on rangeland management have deteriorated rangelands condition and destroyed pastoralists' socio-economic self-sustaining systems, forcing many of them to leave their lands and resettle in urban centers.Over the past decades, science has played a key role in knowing the rangeland degradation indicators 16 , but it has always faced a series of limitations in providing appropriate strategies and solutions in planning and decision making.This is while formal knowledge and indigenous knowledge can be both used to more effectively improve the sustainability of rangelands and their management.The hypothetical role of pastoralists' exploitation in land degradation is mainly based on beliefs induced by ecologists, therefore, the ecological knowledge of pastoralists, which is claimed to be non-scientific, has also been neglected 17 .The indigenous knowledge of pastoralists may help to gain better understanding of rangelands, support bottom-up pastoralists' initiatives and discussions on sustainable land management and develop locally relevant global and national policies 10 .
On one hand, governmental rangeland management in Iran is technically based on the three main dimensions: conservation, restoration and principled exploitation.On the other hand, Iranian pastoralists from both nomadic and rural communities have rich indigenous knowledge for rangeland management.Considering the large area of rangelands and their role in sustainable supply of ecosystem services, it is important to plan rangeland management programs based on the indigenous knowledge of pastoralists.Connecting scientific knowledge with traditional ecological knowledge can fill existing gaps by bringing new perspectives 18,19 and help the sustainable rangeland management.The pastoralists' participation in decision-making for environmental monitoring and assessment is one of the basic principles of rangeland management 20 .Therefore the main objective of this study is to assess knowledge-based behavioral of pastoralists in three technical dimension of conservation, restoration and principled exploitation.Now the questions are, what are the behavioral phenomena of pastoralists in livestock and rangeland management based on their indigenous knowledge?And how effective are each of them in the principled conservation and exploitation of rangelands?Therefore, the present research aimed to reveal the knowledge-based behavioral indicators of pastoralists for rangeland management with the approach of indigenous knowledge (Fig. 1).

Behavior of pastoralists in livestock and rangeland management
Figure 1.Relationships between pastoralists' knowledge-based behavior for livestock and rangeland management.

Study area
The studied area is Tochal rangelands located in Tehran province, Iran (3,931,785 N and 560,433 E to 3,942,868 N 570,709 E, Fig. 2).The region altitude ranges between 1300 and 2200 m a.s.l and has an area of 8133 hectares.The region rangelands are winter rangelands, which are used from the late October to April.Based on De Martonne climatic classification, the region climate is semi-arid.The hottest months of the year are July and August, when the absolute maximum temperature reaches 40 degrees Celsius, and the coldest months are January and February, with an absolute minimum of − 14 to − 16 °C.

Data collection
In terms of practical purpose and information gathering, the present study is a descriptive research which is conducted in the field.The statistical population is made up of 50 pastoralists, all of whom were included in the census.The research instrument was a researcher-made questionnaire.The questionnaire items were set based on 10 individual interviews with expert pastoralists selected by snowball sampling.For the final confirmation of the items, two rounds of group interviews with 6 to 8 people were conducted in a centralized manner, which lasted for 480 min.Group interviews were conducted in the living places of pastoralists in the region.After summarizing the interviews, 23, 18 and 17 items were respectively finalized for exploitation, conservation, and restoration indicators.The respondents were then asked to express positive-to-negative strength of their agreement on each item on a five-point Likert scale including completely disagree (with a numerical value of 1), disagree (with a numerical value of 2), somewhat agree (with a numerical value of 3), agree (with a numerical value of 4) and completely agree (with a numerical value of 5) to measure the knowledge-based behavior of pastoralists with 58 items.The validity of the research instrument was assessed using the opinions of local experts and its reliability was also checked by calculating the Cronbach's alpha (α = 0.877).Data were analyzed by SPSS V.22.Frequency, frequency percentage, mean and standard deviation were used in order to describe personal qualities.The relative importance index 21 was used to prioritize items as follow: Relative importance index = w AN = 1n 1 + 2n 2 + 3n 3 + 4n 4 + 5n 5 5N Figure 2. The location map of Tochal rangelands, Iran.
where w is the weight of each items provided by the respondents, varying from 1 to 5; n1 to n5 are the number of times a scale point was selected by the respondents (completely disagree, disagree, somewhat agree, agree and completely agree; A is the highest weight (= 5 in this study) and N is the total number of respondents (50 people).The relative importance index (w) ranges between 0 and 1.In the inferential part, Friedman's test was used to compare the rank average and the importance of knowledge-based behavior of pastoralists.Spearman's correlation coefficient was used to investigate the relationship between personal qualities and the knowledge level of pastoralists.

Ethics approval and consent to participate
All experimental protocols were approved by Review Board of Department of Natural Resources, Nour Branch, Islamic Azad University, Iran.All methods were carried out in accordance with relevant guidelines and regulations.Informed consent was obtained from all participants.

Personal qualities
All the respondents were married men.Averagely, they were 57.46 years old.About 42% were aged between 56 and 65 years old with the highest frequency.Half of the respondents had more than 6 family members.Illiterate respondents made up more than half the population in the region.About 48% had reading and writing skills.The respondents averaged about 144.20 head of livestock per pastoral unit, ranged from 80 to 230 head of livestock.The average respondents' years of experience was about 41 years, ranged from 18 to 70 years (Table 1).

The knowledge-based behavioral indicators of pastoralists
The prioritizing the items in knowledge-based behavioral indicators of pastoralists based on the relative importance index (Table 2) showed that "the adequate growth of palatable plants is a sign of the start of grazing" and "the soil should not be wet for the start of grazing" had the highest importance for exploitation indicator with the values of 0.816 and 0.784 respectively.For the conservation indicator, "holding meetings by elders regarding rangeland conservation is useful" and "reducing the number of pastoralists during droughts is one of the rangeland conservation ways" were the most importance items with the values of 0.852 and 0.848 respectively.For restoration indicator, "implementation of grazing systems (rotation or rest rotation grazing systems) is one of the rangeland restoration ways" and "the appropriate distribution of watering points is one of the rangeland restoration factors" were the most importance items with the values of 0.840 and 0.812 respectively.
In contrast, "grazing begins based on the type and gender of livestock and the type of vegetation in different areas" and "the start of grazing depends on the health status of livestock" with the values 0.436 and 0.444, "supporting licensed pastoralists and legal action against unauthorized ones by government are of the rangeland conservation ways" and "forming networks for pastoralists is one of the ways to support them, especially during droughts" with the values 0.612 and 0.672, and "making pond next to the fountain is useful for livestock and rangeland" and "harvesting rain water using natural features is one of the ways to provide drinking water for livestock" with the values 0.464 and 0.584 were the less important items for exploitation, conservation and restoration indicators respectively.
There were significant differences between the knowledge-based behavioral indicators of pastoralists (Table 3).The results of mean rank showed that the pastoralists' knowledge-based behavior in order from highest to  3).
The correlations between three knowledge-based behavioral indicators of pastoralists for rangeland management were significant (p < 0.01, Table 4).Exploitation knowledge and restoration knowledge had the strongest and weakest significant correlations respectively.There were also significant correlations between knowledge-based  behavioral indicators of pastoralists and their personal qualities (p < 0.01, Table 4).The knowledge-based behavior of respondents for rangeland management had a positive and significant relationship with their age (r = 0.258) and a negative and significant relationship with their literacy (r = − 0.263).Experience years in pastoralism had also a positive and significant relationship with the knowledge-based behavioral indicators of pastoralists.The amount of income had also a positive and significant relationship with the knowledge-based behavioral indicators of pastoralists (r = 0.290).

Discussion
Today, there is an urgent need to integrate natural and social sciences for the successful management of natural resources.The emphasis is on management approaches that involve local communities in the environmental decision-making process to achieve sustainable environmental management.Local pastoralists are one of the basic components in rangeland management, playing a very important role in the interaction with other factors in the formation of the rangeland management mechanism.Pastoralists have managed their rangelands throughout history and have gained cultural potentials and valuable experiences in their interaction with nature, which should be used for the sustainable management of rangelands.In this study, we tried to reveal the knowledgebased behavior of pastoralists for rangeland management.The results of this research showed that the specialized rangeland management items used by pastoralists can be classified based on their semantic range in three indicators i.e. exploitation, conservation, and restoration.

Pastoralists' knowledge for rangeland exploitation
The adequate growth of palatable plants was the most important item of rangeland exploitation, which is a sign of the rangeland' readiness for grazing start based on the pastoralists' viewpoint.In other words, the lack of annual growth of palatable plants indicates the downward trend of rangeland condition.This proves that livestock and rangeland forage quality are the first priorities for pastoralists, due to their poor living conditions  and the one-dimensionality of their income sources.This findings are in line with the results of [22][23][24] .In fact, the decrease of dominant and palatable plants and the increase of unwanted invasive and poisonous plants are the signs of rangeland degradation, which cause emaciation and weight loss of grazing animals 15,25,26 , increase of the grazing duration and increase of the travel distance of livestock 27 .The appearance and growth of palatable plants, in addition to vegetation diversity, will increase the value of the plant composition, i.e. the higher the quality of forage in the rangelands, the higher the quality of dairy and meat products 28,29 .Rangeland readiness for grazing depends not only on vegetation growth but also on the soil.Therefore, pastoralists examine changes in the color and shape of the soil to determine the proper time at which grazing may begin 30,31 .If the soil is not ready, early grazing will lead to accelerated soil erosion in rangelands.On the other hand, pastoralists considered rangeland depletion and dust emission due to livestock trampling as the signs of the stop of grazing.Therefore, timely stop of grazing is an art that pastoralists do to conserve their rangelands.Therefore, grazing can be continued as long as, firstly, the regrowth potential of forage species especially palatable ones is maintained during grazing, secondly, livestock movement does not cause dust erosion and change in the soil shape.Due to unaffordability of livestock management and purchasing supplementary feeding, the pastoralists are forced to start grazing early.Poverty of pastoralists and lack of non-husbandry sources of income have caused their livelihood and well-being to depend heavily on livestock productivity and rangeland forage.This has intensified due to severe climatic fluctuations and droughts in the last decade.Pastoralists are forced to move their herds early from winter rangelands to summer rangelands due to the lack of forage production and challenges of providing drinking water for livestock.Meanwhile, the extreme fluctuations in the supply and price of fodder in the market have made rangeland-based pastoralism uneconomical.Nevertheless, some pastoralists are still engaged in rangeland-based pastoralism according to their old traditions.

Pastoralists' knowledge for rangeland conservation
The results obtained from the conservation knowledge of pastoralists showed that they have considered holding meetings by elders and reducing the number of pastoralists during droughts as the most important ways to conserve rangelands.Pastoralists in the studied area believed that rangeland conservation starts with themselves as the main beneficiaries of the rangeland.The participation and solidarity of pastoralists makes it possible to be effective in the rangeland conservation while preventing rangeland degradation factors.On the other hand, it is possible to prevent the unauthorized pastoralists from entering the pastoral units in order to avoid overgrazing (the excessive livestock numbers over the grazing capacity), which is one of the most important factors of rangeland degradation.
Due to the recent droughts and severe temperature fluctuations, pastoralists have become more vulnerable in the studied area.The high climatic variability has caused great fluctuations in the supply of rangeland forage and subsequently livestock production, becoming a challenge for livestock management 2,32 .One of the ways to conserve rangelands is to reduce the number of exploiters, according to the pastoralists themselves.Small-scale pastoralists who have less than 100 heads of livestock should hand over their livestock to other pastoralists according to the agreement of the parties.This can have various consequences, such as reducing the animal movement in rangeland, reducing the loss of forage, reducing the number of the pastoral units, and increasing the grazing area of the herd and the proper distribution of livestock in the rangeland.By reducing the number of pastoralists, it is possible to focus more on the drinking water management of livestock especially during droughts.Reducing the number of livestock during droughts through the establishment of a fattening system and selling livestock in local and regional markets or the guaranteed purchase of surplus livestock by the government can reduce the grazing pressure on rangelands.Some pastoralists considered another option, the change of herd composition and matching it with the type of leftover forage in the rangeland.This finding is in line with the results of other researchers 33,34 .Removal of old animals and surplus males by selling them may change the herd composition.This finding is consistent with other researches 35 .

Pastoralists' knowledge for rangeland restoration
Based on the results, pastoralists implement restoration strategies for rangeland recovery which is in the line with the results of other researchers (36).The most important restoration strategies used by pastoralists was rangeland management i.e. rotational grazing systems and resting some parts of the rangeland (enclosure), which are consistent with the results of other researchers 37,38 .Enclosing a portion of rangeland is the most common approach for vegetation restoration and recovery.The pastoralists believed that the implementation of the rest rotational grazing system and exclusion of livestock from a portion of rangeland help to restore the vegetation and soil and create an opportunity for the natural recovery of vegetation.Water resources management was another restoration strategy used by the pastoralists of the region.The proper distribution of watering points and supply of qualitative drinking water for livestock are the basis for the better movement of herd and correct distribution of livestock, which lead to uniform utilization of forage in rangelands.These results are consistent with the other researches 27,33,[39][40][41][42] .In other words, pastoralists have a lot of knowledge on grazing management and herding, which can be used to restore degraded rangelands 27,37,43,44 .The high temperature is a limiting factor for grazing during the day.Therefore, pastoralists use night grazing to solve this problem.In the night grazing system, due to the cooler temperatures compared to the day, the livestock can travel a greater distance without drinking water and it is possible to have better use of the rangeland forage.

The relationships between pastoralists' personal qualities and their knowledge for rangeland management
As the results showed, the behavior of pastoralists towards rangeland management changed and their knowledge level increased as their age and experience years in pastoralism increased.Aging is along with the increase in experience, observation and different trials and errors, which results in the higher level of indigenous and experimental knowledge in older pastoralists than younger ones 45,46 .In addition, education, income and trust in the government's participation in the rangeland restoration and conservation have a positive effect on the conservation knowledge of pastoralists 47 .The interactions and continuous communication, while expanding their social network, provide the basis for increasing the knowledge of pastoralists.On the other hand, the poor living condition of elders has caused young people to have less desire for pastoralist life.Despite the low literacy level in the elderly, they have more information regarding the dimensions of rangeland management in the form of indigenous knowledge.Therefore, they may not be able to write down their knowledge, but they have the ability and skill to transfer their knowledge to others.Also, the findings indicated that the higher knowledge level of pastoralists in rangeland management, the higher income from animal husbandry.The results of other studies have confirmed the obtained findings 36,47 .For example, Maasai pastoralists in Kenya use traditional methods to manage livestock nutrition, diseases, breeding and protection against predators and other accidental events 10 .Forage storage during the rainy season and its use during the droughts and seasonal movement of herds are two important traditional grazing strategies used by pastoralists 41 .Common free grazing of rangelands, optimal use of rangeland, division of the herd based on plant species in rangeland, and seasonal assessment of rangeland condition are of the traditional principles of management among pastoralists 15 .Other strategies for grazing management include purchasing supplementary feed during droughts and reducing the number of livestock in sensitive times 42 .Health care and purchasing supplementary feed during droughts and choosing suitable rams with the characteristics desired by the pastoralists have been of the rangeland management practices among the Botswana pastoralists 48 .With the increase in the number of livestock, the pastoralists tries to meet their needs based on individual knowledge, forcing them to seek to acquire and increase their knowledge and information in order to reduce the costs of animal husbandry and animal maintenance, especially for health care, veterinary medicine and animal pests.
Although in this research, the analysis of a number of items based on separate axes was examined and evaluated to prove the compatible traditional techniques and methods, but the results show that these traditional techniques and methods are compatible with sustainable development.It seems that this classification of items is able to pay attention and emphasize components such as grazing methods, grazing systems, determination of rangeland capacity, production estimation, allowable use and pastoral units' characteristics and provide a suitable model for sustainable conservation and exploitation of rangelands.The summary of the opinions of the pastoralists shows that social structure and geographical conditions play an effective role in the formation and development of items.Although many believe that with the introduction of modernity into the social system, we are witnessing the breaking of emotional bonds and the neglect of identity roots in different social layers, it is recommended that for the implementation of cooperative projects and activities to achieve a sustainable management in rangelands, the integration of local ecological knowledge with official knowledge along with the promotion of the social status of the pastoralists should be considered by the experts.

Conclusion
Indigenous knowledge is an effective knowledge in rangeland management, including exploitation, conservation, and restoration.The objective manifestation of this claim is the better condition of region rangelands with indigenous knowledge management compared to rangelands managed with modern knowledge.Undoubtedly, the prevailing problems in the pastoralism rangelands have a complex and sometimes completely unknown nature, and prescribing a similar prescription will not answer the degradation process prevailing in the rangelands.Consequently, indigenous knowledge approach can be considered as an effective component in the rangeland management, and perhaps it can be said that the compatible integration between local knowledge and modern knowledge can lead to the strengthening of the positive effects of both management systems and results to an evolution in the condition of pastoralism rangelands.

Figure 3 .
Figure 3.Comparison of the knowledge-based behavioral indicators of pastoralists for rangeland management.

Table 1 .
Personal qualities of the respondents.

Table 2 .
The ranking of the knowledge-based behavioral indicators of pastoralists.

Table 3 .
The differences between the knowledge-based behavioral indicators of pastoralists for rangeland management based on indigenous knowledge approach.

Table 4 .
Correlation between the knowledge-based behavioral indicators of pastoralists and personal qualities of the respondents.Significant correlations are shown by: *p = 0.05; **p = 0.01.