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Jinta Oasis environmental effects of agricultural ecosystems Emergy Evaluation of Dynamic

Author: MaYaLan
Tutor: LiuPuXing
School: Northwest Normal University
Course: Physical Geography
Keywords: Jinta Oasis Agro-ecosystems Emergy analysis Circular Economy Evaluate Countermeasure
CLC: S181
Type: Master's thesis
Year: 2010
Downloads: 119
Quote: 0
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Abstract


Jinta Oasis is located in the middle and lower reaches of Heihe River Basin, north central Hexi Corridor, Badan Jaran Desert edges. In recent years, with the rapid development of oasis agriculture, water shortages have become increasingly prominent, oasis surrounding dunes, sand brought to the oasis invasion, the natural environment and man-made environmental degradation disorders intertwined, severe ecological damage and environmental pollution coexist, severe threaten the ecological balance and local economic development, making an impact on Jinta Oasis in Heihe River Basin ecological environment and sustainable development in sensitive areas. Scientific analysis of the oasis ecosystem resources environmental effects of agricultural development history, evaluation of its development status, oasis agriculture for achieving sustainable development of ecosystem health has important theoretical and practical significance. American ecologist HTOdum in the late 1980s, based on the analysis of the energy created by Emergy Theory, the agro-ecosystem as a complex ecosystem, considering the economic, ecological and social benefits and ecological flow characteristics, as agro-ecosystems research provides a new perspective and means. In this paper, energy analysis theory, the Jinta Oasis agro-ecological environmental effects of the system's resources and energy value of inputs, outputs situation analysis, research system elements and the intrinsic link between the external environmental factors on the impact of agricultural ecosystems. On this basis, the circular economy theory as a guide to establish oasis agricultural recycling economy Emergy evaluation index system, evaluation oasis agriculture circular economy development, and the development status of pathological diagnosis, seek hinder the development of oasis agriculture circular economy limiting factors, the results showed that: (1) the last 40 years, agricultural ecosystems Jinta Oasis total emergy input and output showed an increasing trend. Agroecosystem emergy input to the system outside of nonrenewable emergy-based industrial support, fertilizers, agricultural machinery and farm power is dominant. In the agro-ecosystem emergy, the crop production is dominated by agricultural ecosystems Jinta Oasis is a pillar industry, animal husbandry followed, and crop and livestock production have mutually alternative. (2) agricultural ecosystems Jinta Oasis net energy yield ratio, emergy density, population carrying capacity, sustainable development index emergy indices results reflect the dynamic changes of Jinta Oasis agricultural ecosystems in the introduction and use of foreign capital, resources, technology and innovation, flawed. It also describes the system faces increasing pressure on the environment in sustainable development capacity decreased rapidly, should pay attention to the health of agricultural development and sustainability in achieving economic system, we must focus on protecting the ecological environment, improve ecological benefits. (3) the last 40 years, Jinta oasis agriculture circular economy development level of the overall downward trend in agricultural economic development factors layer and resource recycling targets to promote the circulation of agricultural oasis raise the level of economic development, resource reduction, environmental safety indicators inputs and resources then for oasis agriculture to impede the development of circular economy. (4) impact of Jinta Oasis obstacle to the development of agricultural circular economy factor focuses on resources and the environment of security, fertilizers, pesticides and plastic film and other non-renewable resources, extensive use of chemical auxiliary serious impediment to the economic development of the agricultural cycle. With the increasing levels of agricultural chemicals, Jinta Oasis agricultural ecological environment deteriorating, reduce the level of sustainable development, become an obstacle to the development of agricultural recycling economy is a major factor. (5) According to the energy value of the analysis and evaluation of results, the prompting Jinta Oasis agro-ecosystems healthy development of specific countermeasures.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Agriculture and Biology > Agroecology
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