摘要
运用生态位适宜度理论,在前人研究的基础上,构建了草地生态系统适宜度与进化动量测算数学模型。选取人口密度、人均GDP、第一产业人均GDP、农民年均纯收入、中度以上退化草地比例、平均产草量、鼠害发生面积所占比例、单位面积草地牧业产值、载畜量9项指标,测度了甘南草地生态系统生态位适宜度和进化动量。结果表明:甘南州各市、县草地生态位适宜度空间差异较大,根据适宜度可分为五级,并对其空间差异进行了分析。
Based on the historical research results, the mathematical model of niche suitability and evolutional momentum of grassland ecosystem in Gannan was established by means of niche suitability theory. Eight indices were used to measure the niche suitability of the grassland ecosystem and evolutional momentum, including population density, GDP per capita, GDP per capita in the first industry, farmer＇s annual net income, ratio of grassland degraded at medium level, average biomass, grassland area damaged by rodents, animal production value per unit grassland and stocking rate. The resulted showed that there were big spatial differences of grassland ecosystem niche suitability among different counties and cities in Gannan. The niche suitability could be ranked into 5 levels and their spatial differences were analyzed.
出处
《草业科学》
CAS
CSCD
北大核心
2009年第4期1-5,共5页
Pratacultural Science
基金
甘肃省科技攻关项目(2GS052-A41-007-03)
