【摘要】 以川西北高原红原县为研究区,用方格取样法,在相邻的高寒灌丛草地和高寒草甸样地中分别随机取0~20 cm土样50个,并分析了这些土样的土壤性状。利用SPSS(11.0)软件对实验数据进行了统计、分析和比较,研究了两个样地的各种土壤养分的平均含量、空间异质性和相关关系。结果表明,草甸样地的粘粒含量、Ptotal、Ntotal、ORG、Pavail、Navail、Kavail的含量都高于灌丛样地,且两样地速效养分差异极显著,但草甸样地土壤的ORG、Navail、Kavail的变异系数(CV)却明显小于灌丛样地,特别是Kavail的CV值,灌丛样地比草甸样地高出了53.37%;相关分析还表明,相对于草甸,灌丛样地中各养分元素之间的相关性明显增强。说明灌丛对高寒草甸土壤资源的异质性有明显的影响,其存在降低了草甸土壤养分的均值含量并增强了土壤养分的变异性和侵蚀潜力,不利于高寒草甸土壤养分的保持。更多还原

【Abstract】 The northwestern plateau of Sichuan province is the important zone of containing water of Yangtze River and the Yellow River,and the important part of South agriculture and stock breeding interlaced area,the ecosystem is very frangibility because of high altitude and cold climate.Latter years,the grassland degradation and desertification is very serious.The course of land degradation is the transformation at time and space distributing of soil resource.This article studied the relations between the vegetation change and space distributing of soil resource.This research used pane sampling,random sampled 50 soil samples in the depth of 0～20 cm of each site in two adjacent sites representing the Alpine meadow and Alpine shrubland respectively,in study area in Hongyuan county of the northwestern plateau of Sichuan province,and analyzed the nutrition composition of these soil samples.Have been done statistical work,analyzed and compared these experimental data using the SPSS（11.0）,studied the mean concentration,spacial heterogeneity and correlation relation of each soil nutrient.Results indicatedthat meadow is higher than shrub land in concentration of soil viscid grain,P_total,N_total,ORG,P_avail,N_avail,K_avail,and difference is the best significant of the quick nutrients.But it is notable that meadow soil is significant lower than shrub land at the coefficient of variation（CV） of ORG,N_avail,K_availin soil samples,especially CV exceeding（53.37 %） were found for K_availin the Alpine shrub land than Alpine meadow.The correlation analyse showed that the correlation of shrub land is not able stronger,relativing to the meadow.Showed that shrub have significant impact to the resource heterogeneity of Alpine meadow soil ecosystem,it exists to decrease the meadow soil nutrient’ average concentration and increase it’s variability,these didn’t go against the soil nutrient’ holding in the Alpine meadow.更多还原