【摘要】 以川西北高原红原县为研究区,选取一个典型的高寒灌丛草地为研究样地,用方格取样法,在丛下和丛间随机取0￣20 cm土样50个,并记录取样地点,分析土壤性状。利用SPSS(11.0)软件对实验数据进行统计、分析和比较,研究了两种生境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,主要养分中除了Ntotal丛下显著大于丛间外,其余都没有显著性差异;两种生境中的各养分元素的变异系数(CV)都属于中等变异水平,除了Ptotal、Pavail的变异系数是丛间更大外,其他都是丛下更大;在两种生境中Pavail与K avail,C/N与Ntotal,C/N与有机质都呈显著、极显著线性相关关系。在丛间pH与C/N,pH与有机质都呈显著的线性相关,而在丛下Pavail与Ntotal,Kavail与Ntotal显著相关,并有较好的线性关系。总体来看,在灌丛下土壤的主要养分N、P、K之间有更好的相关性。说明了灌丛土壤的主要养分元素N、P、K在转化过程中相互影响,且这种关系在灌丛下更为密切,即灌丛对该高寒灌丛草甸的土壤资源的空间分布有影响。更多还原

【Abstract】 A Alpine shrubland was selected as the study site,and by pane sampling,random ly sampling 50 soil samples in 0~20cm of the Alpine shrubland,noting detailed its living surroundings of each soil sample of shrubland according to under shrubs and between shrubs in study area in Hongyuan county of the northwestern plateau of Sichuan province,and analyzing the characters of these soil samples.These experimental data have been analyzed and compared by the SPSS(11.0),and the mean concentration,spacial heterogeneity and correlation of each soil nutrient were studied.Results indicated that the main soil nutrient is no significant difference except that Ntotal of soil under shrubs is notable more than that between shrubs in the two living surroundings of shrubland.Each soil nutrient coefficient of variation(CV)of two diminutive entironment is middle variation,the other CVs of soil under shrubs is bigger than that between shrubs except for Ptotal?Pavail.There are also significant correlation and very significant correlation between Pavail and Kavail,C/N and Ntotal,C/N and organic matter in two living conditions.There are sinificant linearity correlation between pH and C/N,pH and organic matter of soil between shrubs,but Pavail and Kavail,Pavail and Ntotal of soil under shrubs have significant linearity correlaton.Totally,the soil’s main nutrient N,P,K have better correlation under the shrubs.It showed that the main soil nutrient such as N,P,K are translating and affecting each other,and the relation is more osculation under shrubs,and that shrubs have effect on the space distributing of soil resources in Alpine shrub meadow.更多还原