Agro-ecosystem value connotation based on watershed land use

Abstract: The service value of agro-ecosystem is closely related with other product production. The ecosystem can provide service value, which is usually considered as the substitute of purchasing input, in order to benefit the cost reduction. There is dynamic equilibrium between agricultural ecosystem protection and grain output increase, and they have the "falling" relation. In order to maximize profits at the level of land utilization, higher dependence of agricultural producers on ecosystem service will reduce farmland output. In this paper, the production function model of agricultural ecosystem is built so as to reasonably determine the alternative conditions and output results, and quantitative research of allocation proportion between the land reserved and the land providing ecosystem service is conducted. Taking the upstream of Yongding River basin as the study region, the calculation is conducted by means of the elasticity in land yield for production. If the land providing the ecosystem service in the river basin is increased by 1%, the corresponding crop output will be reduced by 2.7%. The quantitative analysis model is given from the micro-level perspective of the "falling" influence of agricultural ecological value, but the research in the influence on environmental protection policies in production shall be strengthened. While there are certainly instances that the interests of agro-ecosystem production and conservation may be aligned, such "win-win" outcomes are typically limited to a certain range of the production vs. conservation space. As literature analysis, some other authors have noted that the characteristic of the interaction between natural and purchased inputs may have important implications for agro-ecosystem conservation policy. The ecosystem services' value often rests on "natural" inputs; when the price of purchased inputs goes up, more land will be conserved to provide ecosystem services. In agro-ecosystems, the changes in the land for planting may also have a dynamic feedback effect on the incentive prices, and the agriculture incentives influence the ecosystem services through motivating the changes in land use and management. Co-benefits and trade-offs can occur over multiple spatial and temporal scales. A typical "falling" in agro-ecosystems is the function of supporting, regulating, habitat and cultural services provided by natural ecosystems, which are substituted for food, fiber and livestock products. This reduction in output will be translated into an increase in agricultural products' prices, as well as greater pressure to produce in other places, as a result, reducing the incentives for other producers to rely more heavily on the ecosystem services in production. At present, the incentives such as payments for ecosystem services are increasingly used to rebalance the supply of non-marketed services. Agro-ecological compensation can eliminate the negative impact of current agricultural production and guarantee the smooth environment-friendly agricultural production. Ecological values are largely influenced by the spatial and temporal dynamic variations and the accurate calculation of input costs and agricultural output remains a challenge. Competitive land utilization and the wide application of pesticides and chemical fertilizers can affect stable and efficient agricultural production, reduce the protein content of crops, and increase the probability of food pollution. Therefore, these magnitudes are so important argues for giving agro-ecosystem protection policy when considering the implications of an ecosystem service approach in future.