Modelling land use dynamics in socio-ecological systems: A case study in the UK uplands

The impact of land use- and climate change on the managed eco-geomorphic balance in the Alps

The terms “land cover” and “land use” are often used interchangeably, although they have different meanings. Land cover is the biophysical material at the surface of the Earth, whereas land use refers to how people use the land surface. Land use concerns the resources of the land, their products, and benefits, in addition to land management actions and activities. The history of changes in land use has passed through several major stages driven by developments in science and technology and demands for food, fiber, energy, and shelter. Modern changes in land use have been increasingly affected by anthropogenic activities at a scale and magnitude that have not been seen. These changes in land use are largely driven by population growth, urban expansion, increasing demands for energy and food, changes in diets and lifestyles, and changing socioeconomic conditions. About 70% of the Earth’s ice-free land surface has been altered by changes in land use, and these changes have had environmental impacts worldwide, ranging from effects on the composition of the Earth’s atmosphere and climate to the extensive modification of terrestrial ecosystems, habitats, and biodiversity. A number of different methods have been developed give a thorough understanding of these changes in land use and the multiple effects and feedbacks involved. Earth system observations and models are examples of two crucial technologies, although there are considerable uncertainties in both techniques. Cross-disciplinary collaborations are highly desirable in future studies of land use and management. The goals of mitigating climate change and maintaining sustainability should always be considered before implementing any new land management strategies.

Tracking changes in the land use, management and drainage status of organic soils as indicators of the effectiveness of mitigation strategies for climate change

Carbon Sequestration in Soils of Latin America

Widespread pollution of groundwater by nutrients due to 20th century agricultural intensification has been of major concern in the developed world for several decades. This paper considers the River Thames catchment (UK), where water‐quality monitoring at Hampton (just upstream of London) has produced continuous records for nitrate for the last 140 years, the longest continuous record of water chemistry anywhere in the world. For the same period, data are available to characterize changes in both land use and land management at an annual scale. A modeling approach is used that combines two elements: an estimate of nitrate available for leaching due to land use and land management; and, an algorithm to route this leachable nitrate through to surface or groundwaters. Prior to agricultural intensification at the start of World War II, annual average inputs were around 50 kg ha−1, and river concentrations were stable at 1 to 2 mg l−1, suggesting in‐stream denitrification capable of removing 35 (±15) kt N yr−1. Postintensification data suggest an accumulation of 100 (±40) kt N yr−1 in the catchment, most of which is stored in the aquifer. This build up of reactive N species within the catchments means that restoration of surface nitrate concentrations typical of the preintensification period would require massive basin‐wide changes in land use and management that would compromise food security and take decades to be effective. Policy solutions need to embrace long‐term management strategies as an urgent priority.

The article analyses the state of the most popular and least popular professions and specialties in Ukraine. It's found that there are no specialties in the field of land management among them. It is also noted that at the legislative level the specialties "Land Management and Cadastre" and "Evaluation of land and real estate" were replaced by the specialty "Geodesy and land management", which belongs to the field of knowledge "Architecture and construction" (technical sciences). It is substantiated that the profession of land manager should relate to the field of knowledge of "Social and behavioural sciences". It's based on the provisions of the Law "On Land Management" and the study of world experience of the essence of the concepts of land management and land management planning (both have technical, socio-economic, legal and environmental focus). It is proved that the profession of land manager needs to be reprofiled. In this regard, there is a need to identify new specialties and specializations and add them into the state classifier DK 003: 2010. It's important to expand the training of specialists within: 1) specialty 193 "Geodesy and land management" specializations "Land Management and Land Use Administration" and "Cadastral Registrar"; 2) specialty 101 "Ecology" specialization "Land management and ecologization of land use", 3) specialty 051 "Economics" specialization "Economics of land management and land use". It is proposed to add them to the classifier. Keywords. Profession "land manager", labour market, perspective specialties and specializations in land management, new qualifications. Formulation of the problem. The development of society at all times was associated with the arrangement of lands, which today remains the main means for the existence of mankind and a source of social wealth. The need to establish the limits disturb landowners from ancient times. This function is performed by land surveyors. When the first representatives of this profession appeared, it is certainly not known. But the land surveyor is now a profession demanded both in the village and in the city. In our country, the profession of land surveyor always respects honour because it is devoted to the invaluable treasures of Ukraine - land, which has always attached special significance. According to the research conducted in Ukraine, soon, the 10 most demanded professions include: programmers (C++, Java), food industry technologists, construction engineers, architects, designers of offices and interiors, personnel managers, recruiters, energy engineers, journalists, technologists of light industry products, financiers (specialization "banking") [1]. In addition, prospective include: hotel business managers, accountants, auditors, lawyers, marketers. According to the Ministry of Education and Science of Ukraine, according to the results of the 2017 admission, the most popular specialties among the entrants for the Bachelor in Ukraine were Philology, Law, and Management. 85 thousand, 74 thousand and 59 thousand applications have been filed for the stated above specialties respectively. In addition, among the leaders are "Medicine", "Computer Science", "Tourism", "Secondary Education", "Psychology", "Economics". These specialties were desirable to enter by 40 to 46 thousand of entrants. The last step in the TOP-10 was "Software Engineering" with the result of 33 thousand applications (Fig. 1) [9]. Despite the stated above facts, it has been revealed that such specialties as "Law", "Management", "Tourism" and "Economics" remain among the most popular among entrants even though they are not in demand in the labour market. At the same time, the high levels in the ranking are occupied by important for the economy specialties, such as "Computer Science" and "Software Engineering". The least popular specialties are (fig. 2) "Theology" (185 applications excluding spiritual higher educational institutions) and "Hydropower" (193 applications for entry). However, specialties for the preparation of a specialist in land management are absent among the most and least popular. Therefore, with a caution we have to perceive the situation. The list of required occupations in the labour market is changing. Focus magazine has ranked the professions that will be promising in 5-10 years [10]. Before allocating the most promising specialties, the publication together with experts identified the areas of the economy that will actively develop in the near future. So, at first there was a list of 40 spheres of the economy, which, according to Focus, will successfully develop in the next 5-10 years. Experts evaluated the prospects for the development of these industries on a 10-point scale, giving each sector a mark from 1 to 10 points. At the same time, each expert could add to the list the industry that was not among the 40 listed, but whose potential he considers rather large. According to the obtained data, the rating of 15 most promising industries has been designed, and include: information technologies, telecommunications and communications, agriculture , pharmaceutical production and pharmacy business, banking, frying and processing industry, transport services, financial services, legal services, household services, metallurgy, alcohol production, energy, livestock , utilities. So, the 20 most promising professions of the next decade will be the following: the seller, the IT specialist, the automation engineer, the marketer, the municipal services engineer, the aeroengineer , the technologist in the production and processing of food products, the technologist of consumer services, logistics, the lawyer (economic and land law ), power engineer veterinarian, pharmacologist, financier, communication engineer, practical psychologist, geneticist, biochemist, robotic technician, nanoengineer. In addition, agrarian countries are actively developing organic and farm farming. This will require the involvement of a large number of employees who are able to work on the ground - and thus, forms a serious niche. In general, the labour market trends in the coming years can be reduced to nine main directions [5]: engineers, IT specialists, nanotechnology specialists, marketers, service providers, logistics, environmentalists, chemists, and physicians. The Resolution of the Cabinet of Ministers of Ukraine dated December 30, 2015, No. 1187, approved new Licensing conditions for the conduct of educational activities [7] concerning the further conduct of educational and scientific work in educational institutions. By the order of the Ministry of Education and Science dated November 6, 2015, No. 1151 "On the peculiarities of the introduction of the list of branches of knowledge and specialties [6], which are the training of applicants for higher education, approved by the Cabinet of Ministers of Ukraine from April 29, 2015, No. 266" [8] approved Table of correspondence List of directions for training of specialists in higher educational establishments for the educational-qualifying level of bachelor (List 1), List of specialties, which was carried out training of specialists in higher education institutions for educational and qualification levels of a specialist and a master's degree (List 2). In the stated above Resolution, it is defined that instead of the specialties "Land Management and Cadastre" and "Land and Real Estate Valuation" – the specialty "Geodesy and Land Management" is established. The latter belongs to the field of knowledge "Architecture and Construction", which belongs to the technical sciences. At the same time, the Law of Ukraine "On Land Management" stipulates that land management is a set of socio-economic and environmental measures aimed at regulating land relations and rational organization of the territory of administrative-territorial units, economic entities carried out under the influence of social and productive relations and development of productive forces [2]. The same law ( Article 1 ) stipulates that activities in the field of land management are the scientific, technical, production and management activities of state authorities, local governments, legal entities and individuals, which is carried out under land management. Land-use documentation ( land management documentation ) is the text and graphic materials approved in accordance with the established procedure, which regulate the use and protection of lands of state, communal and private property, as well as survey and land survey materials, author's supervision of project implementation, etc. Measures on land management – provided by documentation on land management on the rational use and protection of land, the formation and organization of the territory of the object of land management, taking into account their purpose, restrictions on the use and restrictions (encumbrances) on the rights of other persons (land servitudes), preservation and increase of fertility soils. This is evidence that the profession of land surveyor is more likely to belong to the field of knowledge of "Social and behavioural sciences" than to "Architecture and construction". Architecture (Greek αρχιτεκτονικη - construction) is both a science and the art of designing buildings, as well as a system of buildings and structures that form a spatial environment for the lives and activities of people in accordance with the laws of beauty. Land management, as stated in the Law of Ukraine "On Land Management" – a set of socio-economic and environmental measures aimed at regulating land relations and rational organization of the territory of administrative-territorial entities and economic entities on the ground. As the research of A.M. Tretiak and V.M. Tretiak shows, the concept and essence of land management has both a technical direction and socio-economic, legal and environmental. Land managers have worked and work in the structural subdivisions of the State Committee for Land Resources of Ukraine, the State Land Agency of Ukraine and the State Audit Office of Ukraine, state authorities and local self-government bodies, and ministries (where there are departments of land resources); in public and private design and valuation companies, real estate firms, agroholdings, agricultural enterprises; territorial communities, scientific institutions, institutions of legal direction. civic organizations. The land manager learns not only his professional knowledge, but also legal and natural sciences. For a profession it is necessary to have mathematical abilities, engineering approach, spatial imagination, ability to understand the legislation. The profession is extremely interesting and creative, which requires the ability to make informed decisions, communicate with people, requires care, clarity and responsibility. To become a successful specialist in this field, you need to be persistent, self-confident, active, have a well-developed intuition and logical thinking. According to the classification of professions, the professional activity of the land manager relates to professions such as "human-nature". To date, the land manager must have a higher education in the field of "Architecture and Construction" from the specialty "Geodesy and Land Management" , according to the educational qualification level: a junior specialist, a bachelor's or a master's degree. Currently, land managers use modern equipment in their work: electronic instruments; new technologies of geographic information systems. Significant problems arise when making managerial decisions due to the imperfection of the regulatory framework - when three different land managers can have three different views on the same issue. At the same time, for professionals it is extremely important to come to a joint decision. But how can the problems of legislation be explained to an ordinary peasant? It's a shame when you can not help a person in solving his question, and even more - when you do not know how to explain the impossibility of solving a particular problem. The disadvantage of the profession is also that there is little free time for personal life, family and wage mismatch in modern times. The advantages include: work is interesting, lots of communication, new knowledge in land law, and more. At the same time, we consider it necessary to stay on the proposals of A. Martyn outlined in the scientific paper "Directions of adaptation of the content of land management education to the needs of the national and world economy" [3], where he publishes "bad news" for land management education – whether we are ready for them? He states: "Most of our graduates will not develop landuse documentation at all; the number of jobs in the industry is quite limited; the overwhelming part of the "modern" Ukrainian land management is a terrible mix of fairly archaic rules, a crazy bureaucracy and meaningless rituals, in order to master the development of primitive land management documentation, it takes 2-3 weeks of practical training, but not 5 years at the university, and a significant part of cadastral registrar are lawyers. Some of these reservations agreeable. Therefore, his thoughts emphasize once again the need for serious changes in the training of land management specialists. Thus, all of the above stipulates the need for changes in the classification of occupations DK 003: 2010 and the definition of new specialties and specialization training of land management specialists. In our opinion, it is expedient to extend the training of specialists in land surveying in the following areas: 1) specialty 193 "Geodesy and land management" of the specializations "Land Management and Land Use Administration" and "Cadastral Registrar" ; 2) specialty 101 "Ecology" specialization "Land management and ecologization of land use" ; 3) specialty 051 "Economics" specialization "Economics of land management and land use" . At the same time, we consider it expedient to add the following qualifications to the classifier of professions DK 003: 2010: in section 8 "Main specialists – heads of scientific research units and subdivisions on scientific and technical preparation of production and other managers" – Chief land surveyor; in section 14 "Managers of enterprises, institutions, organizations and their subdivisions" – Manager of land management, Manager in the field of operations with land, Manager in the field of research in the land market; in section 25 "Agronomists, hydraulic engineering, forest managers and professionals of related professions" – Land manager; in section 33 "Assistant veterinarians, junior specialists in agronomy, forestry, water management and nature conservation" – Land Resources Inspector; in section 34 "Other technical specialists in the field of management" – State Inspector for the use and protection of land; in section 249 "Professionals not included in other classification groups". Land manager-ecologist, Land manager-designer. Conclusions. Summing up, we note that the assignment of the specialty "Geodesy and land management" to the field of knowledge "Architecture and Construction" (engineering science) does not comply with the provisions of the Law "On Land Management", the study of world experience of the essence of the concepts of land management, which determined that they are inherent in technical, as well as socio-economic, legal and environmental trends. In this connection it is proved that the profession of land manager belongs to the field of knowledge of "Social and behavioral sciences" . In view of this, the need for re-engineering the directions of land management training is urgent. Therefore, we must work ahead and make changes to the classification of professions DK 003: 2010 regarding the definition of new specialties and specialization training of specialists in land management. We consider it expedient to expand the training of specialists within: 1) specialty 193 "Geodesy and land management" of the specialties "Land Management and Land Use Administration" and "Cadastral Registrar" ; 2) specialty 101 "Ecology" specialization "Land management and ecologization of land use" ; 3) specialty 051 "Economics" specialization "Economics of land management and land use" (qualification "Land Management Manager"). It is proposed to make changes to the list of qualifications.

The present study focuses on the economic, political/institutional, technological, cultural, demographic and environmental drivers of land use change. It aims to understand the factors influencing land use decisions at the household level, in particular the influence of migration. The study is guided by the hypothesis that international migration is driving land use change through the investment of remittances, funds sent back by migrants to their families in the country of origin. This research is based on a political ecology approach and the conceptual framework relies on three theoretical concepts. First, the concepts of proximate causes and driving forces were used to identify the factors behind changing land use. In addition, the concept of remittance landscapes, a concept developed in the framework of this study, which is defined as an emerging type of landscape driven by the investment of remittances, was used to evaluate the impact of remittances on land use in the study area. Fieldwork was conducted in the municipality of Autlán in the state of Jalisco in Mexico over a total period of 8 months between 2002 and 2004. Land use changes between 1990 and 2000 were quantified based on satellite image analysis. Underlying driving forces of these changes were examined based on land use change data collected by survey as well as data available from municipal, state and federal agencies. Land use changes observed in the study area between 1990 and 2000 include a slight increase of agricultural land (2%), of urban land cover (0.5%) and of pine-oak forest (0.7%). Over the same period, pasture increased by 18% while dry forest decreased by 10%. Rapid and extensive land use change is occurring on rainfed agricultural land, as maize cultivation is converted to the cultivation of agave azul used for the production of tequila. The first plantations of agave azul were established in 1996 and by 2002, agave azul was planted on 33% of all rainfed agricultural land of the municipality. 84% of owners of rainfed land included in the survey had changed land use from maize to agave during this time period. The dynamics of several proximate causes are driving this change: 1) Market prices for maize decreased by 46% between 1994 and 2004 while the costs for agricultural inputs continually increased so that the cultivation of rainfed maize was no longer economically profitable; 2) The variability of rainfall combined with a lack of irrigation water limits the choice of economically viable alternatives to agave azul; 3) In the large majority of cases, landowners rent out their land to tequila companies in reverse leasing arrangements for seven-year periods (the duration of one growing cycle of agave azul). During this time they do not have to work on their own fields and are free to find off-farm employment or to migrate to the US and; 4) Landowners continue to receive agricultural subsidies even though the land is rented out, as agave azul is one of the eligible crops. Overall, the main driving forces identified in the study area are economic (market prices), environmental (variability of rainfall, soil quality, topography), political/institutional (agricultural subsidies, land tenure) and demographic (labor availability). Technology and culture appear to be less important. Results of the present study confirm the hypothesis that global factors, especially international trade agreements such as NAFTA (North American Free Trade Agreement) increasingly influence land use change. However, they are not sufficient to function as a sole driver of land use change. Environmental factors are a critical determinant of whether a certain land use change will occur or not. The decisive aspect behind the observed land use changes are the multiple interactions between specific factors at different levels and not the predominance of one particular driving force functioning at a particular level. International migration is a significant livelihood strategy in the study area, especially for lower-income communities. On average, 50% of all households have or had at least one family member in the US as a migrant between 1980 and 2004, and remittances represent 45% of total household income. In general, the bulk of remittances income is used for subsistence needs and to repay debts. Nevertheless, on average, 30% of migrant households invest remittances in land, livestock, agricultural production and in house construction. All these investments lead to land use changes. The impact of remittances on land use changes is variable, and depends on the socio-economic, political and environmental context of the community and the individual situation of the migrant household. In low-income communities, remittances might be used to repair existing housing, while in higher-income communities, remittances are used to construct a new house, converting agricultural to urban land. With regard to changes in labor availability due to out-migration, the results are ambiguous. Migration can drive land use change by encouraging a shift to low-labor land use systems, but these land use changes that require less labor can also drive migration. The concept of remittance landscape developed by the researcher has proved useful for analysing the impact of remittances on land use changes. A combination of area-based and actor-based evaluation criteria are effective in order to describe quantitative as well as qualitative landscape transformations driven by the investment of remittances. Landscapes where the investment of remittances leads to a change of land use from subsistence to cash crop cultivation should be included as a potential type of remittance landscape, even though the basic type of the landscape (agricultural) remains unchanged. Accordingly, at least six different types of transformations into remittance landscapes are possible: a) forest to pasture, b) forest to agriculture, c) forest to urban, d) agriculture to pasture, e) agriculture to urban and f) change of agricultural system. In conclusion, the study area on which this research focused is not considered to contain any remittance landscapes because remittances are only partially driving the extensive land use changes occuring in the region.

Changes in land uses and management in two Nature Reserves in Spain: Evaluating the social–ecological resilience of cultural landscapes

Conventional agricultural practices often lead to increased soil compaction, a decline in soil organic matter (SOM) and an associated decrease in structural porosity, compromising the water holding capacity and resilience of agricultural soils to hydrological extremes. Regenerative agriculture practices, with their focus on building healthy soil ecosystems, hold promises for enhancing agricultural resilience to extreme weather events like floods and droughts. These practices, such as reduced tillage, reduced trafficking and stocking density, cover cropping, and afforestation, can improve soil organic matter content, reduce compaction, enhance soil structure, and promote microbial activity, leading to increased soil porosity, water infiltration, and retention. However, due to the slow response of soils to changes in agricultural management, a critical research gap exists in the timely quantification of the potential effectiveness of these practices in mitigating flood and drought risks. Although undoubtedly robust and informative, long-term monitoring of soil properties before and after a management intervention may take decadal timescales to reveal any significant impacts.We have therefore adopted an exploratory approach to investigate the merits of back-analysing existing long-term soil moisture datasets to reveal any changes in inferred soil porosity due to changes in land use and/or management. The following UKCEH long-term datasets, which include soil moisture information, have been considered: Neutron Probe Soil Moisture Database (~50 years range), UK Greenhouse Gases Flux Network (last 15+ years), and COSMOS-UK TDT probe data (last 10 years). In addition, we have land cover information from UKCEH Land Cover Maps from 1990 onwards. For UK conditions, it is anticipated that an annual maximum soil moisture content, representing saturated conditions, is likely to be attained during most winter seasons (excluding any ‘dry’ winters, excluded based on rainfall data). It is then possible to estimate soil porosity in any particular year by equating it to the maximum soil moisture content, in effect using this as a proxy measurement with due regard for potential air entrapment effects. Any identified long-term changes in soil porosity obtained through trend, wavelet, and before-after-control-impact analysis might then be linked to changes in land use and/or management. Land cover changes may be identified using Land Cover Map data and local site knowledge, the latter of which will also provide insights into changes in land management. COSMOS-UK TDT data is particularly interesting in terms of land management impacts as, when installed, the instrumentation at each site was enclosed by a newly erected fence. The resultant compound therefore excluded stock and vehicle trafficking and initiated a change in land use from generally arable or improved grassland to rough grassland. It will therefore be valuable to understand if the proposed exploratory analysis approach can reveal any significant changes in soil porosity over time due to this intervention. Likely challenges to be discussed include disentangling any long-term changes in maximum soil moisture due to changes in soil porosity from background changes in climate. We will also share lessons learned and provide recommendations for future work on the back-analysis of long-term soil moisture datasets.    

Land-use is facing multi-dimensional challenges, among other things stemming from climate change and extreme weather events, taxing socio-economic and market conditions, changing societal and consumer trends, as well as complex subsidy regimes and environmental regulations. These combined challenges require land users to increasingly adapt their management strategies and decision-making routines. To test for potential effects of these challenges on patterns of land-use change requires models that incorporate systemic feedbacks between land users and their environmental, socio-economic and political framework conditions. To this end, we developed the agent-based model SECLAND-ABM, simulating land-use change resulting from decision-making processes of individual farm agents (i.e. agricultural holdings). The model enables to link biophysical and societal drivers of land-use change and, through subsequent (soft) coupling with biodiversity or ecosystem models (e.g., SDM, LDNDC), their effects on ecosystem change.The first model version was developed for the alpine LTSER Platform Eisenwurzen in Austria. The focus of the present study is to transfer the SECLAND-ABM to the LTSER Platform Doñana in southern Spain. The region represents a completely different environmental, agricultural and socio-economic context, comprising a unique and well-protected wetland ecosystem surrounded by a complex matrix of mostly intensive and mono-functional agriculture. The socio-ecological system is critically impacted by climate change as well as excessive anthropogenic land and water use, threatening local biodiversity and agricultural production.The transfer of agent-based models between study regions is rare and often constricted by the need for a broad range of quantitative and qualitative data, as well as by a lack of flexibility in adapting the model logic to new types of agents and their behaviors and interactions. Therefore, we further developed SECLAND-ABM to enable its transfer to other distinct study regions. This development represents a significant methodological innovation in the field and the present study provides a proof-of-concept generating critical insights for further progress.To implement model transfer we require different data sets spanning the natural and social science domains (i.e., geo-spatial, environmental, census and qualitative data), describing the local land system and its land users’ behaviors. Subsequently, we define model agents and their decision options congruent within this new context and create distinct scenario conditions to test for the effects of potential changes in the biophysical, socio-economic and political frameworks.This presentation aims to provide: a short description of the SECLAND-ABM and its main components, a brief overview of the LTSER Platform Doñana and its core challenges connected to land use and climate change, as well as a spotlight on the status-quo of model transfer, particularly related to the collection of input data, the specification of model agents and their decision options, and the definition of scenario conditions. a short description of the SECLAND-ABM and its main components, a brief overview of the LTSER Platform Doñana and its core challenges connected to land use and climate change, as well as a spotlight on the status-quo of model transfer, particularly related to the collection of input data, the specification of model agents and their decision options, and the definition of scenario conditions.

Incentives, land use, and ecosystem services: Synthesizing complex linkages

To mitigate climate change at local, regional, and global scales, we must begin to think beyond greenhouse gases.

The influence of land use and management on soil carbon levels for crop-pasture systems in Central New South Wales, Australia

Water Accounting Plus for Water Resources Reporting and River Basin Planning

Traditional rice agroecosystems face socioeconomic, political, technical and environmental challenges that are resulting in changes in the traditional land use and management system and its contributions to indigenous farmers. This study explored the contributions made by swidden and wet rice agroecosystems in a traditional rice cultivation landscape and how this landscape has been influenced by recent changes in land use and management. Data were gathered from two villages in the Upper Baram, Malaysia, using semi-structured interviews with 43 farmers, and examined by qualitative content analysis. Farmers perceived different benefits from the rice agroecosystems over and above rice, such as non-rice food supply, habitat creation and support of their identity. The wet rice agroecosystem benefits farmers through higher rice yields, while the swidden rice agroecosystem provides a greater diversity of material contributions. Recent trends in land use and management towards the wet rice agroecosystem and plantations, driven by farmer preferences, land use policies and socioeconomic factors, are challenging the contributions available to farmers from the traditional rice cultivation landscape. Actors involved in decision-making in the traditional rice cultivation landscape should therefore consider the impact of land use and management changes on the diversity of contributions provided by rice agroecosystems.