Analysis of AHP strategic decisions for the ecological risk of grazing system and management decisions in an alpine meadow at Gannan, Gansu

Abstract

Abstract: This study explored the primary risk factors restricting the development of stockbreeding and the characteristics of its varied temporal-spatial distribution in eco-economic terms. It further reveals the connotation of ecological risk analysis. Based on the multi-hierachy AHP strategic decision model, the ecological risks of a grazing management system in the alpine meadow at Maqu, Southern Gansu were comprehensively analyzed. Among the factors leading to the degeneration of vegetation and the formation of sandy soil, long-term overgrazing was the main factor, with a weighting of 0.480 3. The risk of reduction in rainfall from global climate change, mouse and insect pests, were weighted 0.290 2 and 0.155 8 respectively. Effects of other human improper activities (e.g. digging medicinal herbs and mining) were less important and weighted at only 0.073 7. Among the strategic measures of management, rotational grazing (to reduce the density of grazing), reseeding, fertilization and enclosure for the degraded pasture showed the best effects, and the combination weightings were 0.306 0 and 0.266 1. Deratization and establishing artificial pasture also showed some effects. Based on the above risk evaluation analysis, the main management decision for a precautionary measure of the ecological risk was proposed, being quantitative support for meadow resource protection and sustainable development.

CLC Number:

S812.8

LI Wen-long, SU Min, LI Zi-zhen. Analysis of AHP strategic decisions for the ecological risk of grazing system and management decisions in an alpine meadow at Gannan, Gansu[J]. Acta Prataculturae Sinica, 2010, 19(3): 22-28.

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