【摘要】 运用主成分分析法对陕北农牧交错区生态环境的主要影响因素进行了提取。研究结果表明:自然生态压力与水资源利用效率因子、资源与人类活动压力因子、农业生产压力与水资源压力的综合因子是影响陕北农牧交错区生态环境的主要因子;通过线性回归模拟分析发现,1994~2005年,榆阳、神木、横山、府谷4县(区)的生态环境综合得分分别以-0.10/a、-0.06/a、-0.04/a、-0.01/a的速率下降,而靖边和定边1999年后出现扭转,分别以0.09/a、0.08/a的速率呈现上升态势;从陕北农牧交错区生态环境空间变化分析,榆阳区在12年中生态环境综合平均得分为1.32,属潜在脆弱区,靖边和横山平均得分0.61和0.43,为轻度脆弱区,神木平均得分为-0.26,属中度脆弱区,府谷和定边平均得分为-1.14和-1.01,属重度脆弱区。结合变化趋势可以看出,靖边生态环境逐渐趋于好转,而府谷生态环境状况逐步退化,且现状已不容乐观。更多还原

【Abstract】 The agro-pastoral ecotone is the most sensitive eco-environmental area in North China.It is also a typical region in which the eco-environment issues,such as soil erosion,desertification,and the grassland degeneration is prominent,which is attributed to the natural conditions and human activities.Using the method of principal component analysis,the main affecting factors are analyzed.The results indicate that the natural ecological pressure and water use efficiency factor,resources and human activities pressure,agricultural production and water resources pressure factor play important roles in eco-environmental evolution in this area.The linear regression analysis simulation indicates that the score of eco-environment quality takes on the degradation trends in Yuyang, Shenmu,Hengshan and Fugu from 1994 to 2005.On the contrary,the score of ecoenvironment has increased in 0.09/a and 0.08/a in Jingbian and Dingbian.The results of spatial changing of eco-environment indicate that Yuyang gets 1.32,which belongs to potential.Meanwhile,Jingbian and Hengshan get 0.61 and 0.43,belonging to light vulnerability area;Shenmu gets 0.26,belonging to medial vulnerability area;Fugu and Dingbian get-1.41 and-1.01,belonging to extreme vulnerability area.更多还原