Abstract
The research on sustainable utilization of cultivated land eco-economic system has important practical significance for understanding cultivated land status and promoting sustainable utilization of cultivated land. Based on energy value theory and analysis method, this paper establishes the evaluation Index system of cultivated land eco-economic system in Yunnan Province, and chooses 5 main indexes, such as net energy output rate, environmental bearing ratio, system production dominance, system stability index and sustainable development performance index, etc. The energy input-output structure and sustainable development status of cultivated land eco-economic system were evaluated. The results show that the net energy yield of cultivated land system in Yunnan province is 0.29, lower than the national average, and the competitiveness of agricultural products is not enough; the system production dominance and system stability index are 0.51 and 0.68 respectively, which indicates that the system self-control, adjustment and feedback need to be strengthened, the environmental carrying capacity and sustainable development performance index were 0.66, 4.21, reflecting the province's arable land system in the sub-sustainable state. Therefore, the current agricultural development mode should be adjusted to optimize the input structure, and we should actively introduce external energy value, make full use of external resources, and relieve resource pressure. On the basis of applying agricultural science and technology, strengthening the utilization intensity of renewable auxiliary energy, developing green industry, reducing the environmental pressure on cultivated land system, realizing the sustainable utilization of cultivated land system.
Highlights
The cultivated land ecosystem is a kind of special ecological form between natural ecosystem and artificial ecosystem, which is cultivated under the artificial cultivation system [1]
3.2.1 Net energy yield In Yunnan Province, the net energy yield of 2016 years was 0.29, which was lower than the average net energy yield of national Agricultural system (1). 42) and the net energy yield of cultivated land system in Guangdong Province (0. 95).It is indicated that the overall function of farmland system in Yunnan Province is not ideal, the conversion rate of input energy is low, and with the same amount of input, the low energy output of cultivated land system in Yunnan Province can be obtained, and the product does not have price competitiveness
Yunnan Province, as the Southwest Frontier Province, food security closely related to the country's long-term stability, in the economic construction of the erosion of arable land, the urgent need to study the sustainable use of arable land, and effectively protect scarce arable land resources, and actively for the food security in Yunnan to make suggestions
Summary
The cultivated land ecosystem is a kind of special ecological form between natural ecosystem and artificial ecosystem, which is cultivated under the artificial cultivation system [1]. Many scholars have made a great deal of theoretical and empirical research on the evaluation of sustainable utilization of cultivated land, but they have neglected the contribution of natural resources to social and economic development, and urgently need to comprehensively consider the relationship between ecological environment system and human social economic system under the situation of energy and ecological crisis. The theory and method of energy value analysis (h.t.odum) is a method of evaluating the degree of sustainable development based on the research of the power system in the late the 1980s, which transforms the energy and material of different classes of flow and storage into the energy value of the unified standard, and carries on the quantitative analysis, which provides a heavy for the rational utilization and evaluation of cultivated land resources. The paper uses energy value theory and analysis method to evaluate the cultivated land ecoeconomic system in Yunnan Province, in order to provide reference for the sustainable use of cultivated land in Yunnan province, and to provide references for government decision-making
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