关中地区人类活动对生态系统胁迫变化影响评估

Estimation of Effects of Human Activities on Ecosystem Stress Changes in Guanzhong Region

以关中地区为对象,选取社会活动强度、开发建设活动强度、农业活动强度、污染物排放强度四大类11个指标,运用SPSS 20.0的主成分分析法将2000、2005和2010年各种胁迫要素间相互作用关系矩阵化,分析它们之间的联系,并计算出各市（区）人类胁迫综合指数（HPI）,进行排序.结果表明,不同时期对关中地区生态系统胁迫最大的因子也不同,2000年对生态系统产生胁迫最大的因子为化肥施用强度,2005年为城镇人口密度,2010年为人口密度、城镇人口密度、GDP密度、第二产业增加值密度、第三产业增加值密度;2000～2010年关中各市（区）受人类活动胁迫综合指数影响强度由高到低分别为杨凌区、西安市、咸阳市、渭南市、铜川市、宝鸡市.

With Guanzhong Region as object,selecting social activities,development and construction activities,agricultural activities,pollutants emission intensity 4 types 11 indexes,SPSS 20.0 principal component analysis method was used to matriculate various indicators,analyze the relationship between them,and figure out the HPI of cities in Guanzhong,it＇ s contribute to simplify the relationship between different stress factors.The research results show that the biggest stress factors affecting the ecological system of Guanzhong area are various at different times.The biggest stress factors affecting the ecological system are respectively strength of fertilizer and urban population density at 2000,2005,which are population density,urban population density,GDP density,density of the second and third industry added value in 2010.The stress composite impact strength of human activity from high to low in every city of Guanzhong area during 2000 and 2010 is Yangling,Xi＇ an,Xianyang,Weinan,Tongchuan,Baoji in turn.