Human Activities On Ecosystems Stress Assessment

Different ways of human activities affect the guanzhong region ecosystem health through the intricate interaction.The study selected social activities,development activities,agricultural activities,pollutants emission intensity four types as the research object,utilized principal component analysis method to matriculated various indicators, analyzed the relationship between them,and figured out the HPI of cities in guanzhong,it’s contribute to simplify the relationship between different stress factors.The research results show that:(1)The biggest stress factors affecting the ecological system of socio-economic activitiy factors in2000are DSIVA,DSIVA;development and construction activity factors are USLI,RD;agricultural activity intensity factor is CFUI;pollutant emission intensity factors are CODI,SDOI.In2005,the biggest stress factors of socio-economic activities are DGDP,DSIVA,DTIVA,PD;development and construction activities are USLI/RD;agricultural activity intensity factor is CFUI;pollutant emission intensity factors are CODI,SDOI.In2010,the biggest stress factors of socio-economic activities are PD,DGDP,DSIVA;development and construction activities are USLI/RD;agricultural activity intensity factor is CFUI;pollutant emission intensity factor is CODI.(2)The biggest stress factors affecting the ecological system of guanzhong area are various at different times. The biggest stress factor affecting the ecological system is RD in2000and RD,UPD are the biggest stress factors in2005, which are RD, UPD,PD,DGDP,DTIVA,USLI,WRUI at2010.(3)The stress composite impact strength of human activity from high to low in every city of guanzhong area during2000and2010is Yangling, Xi’an,Xianyang, Weinan, Tongchuan, Baoji in turn.(4)There is a interaction relationship between the stress factors,and2000,2005,2010stress factors weight distribution in xianyang,verify the results above stress intensity factors which stress on ecosystems and HPI sorts are accurate and reasonable.This article throughout to evaluate ecosystem stress of the guanzhong region, not only for ecosystem recovery and development in the study area has important significance, but also in the ecosystem construction has extraordinary significance to other parts of in shaanxi province, the results can be used to guide the area and the areas which environment similar where targeted for ecosystem restoration and construction, and has extensive application value in practice.