藏西北阿鲁盆地冰川棘豆覆盖度与环境因子相关性研究

Study on Correlation between Oxytropis galacialis Cover and Its Environmental Factors in Aru Basin,Northwestern Tibet Autonomous Region

通过两因素方差分析以及多元线性回归分析方法对冰川棘豆盖度及其环境因子进行研究。结果显示,水分条件对冰川棘豆盖度大小的影响极为显著(p=0.01714);影响水热分配的主导因子坡向、坡度与冰川棘豆盖度极为相关,其中南坡和西南坡的冰川棘豆盖度最大、西北坡最小。放牧强度与冰川棘豆盖度相关显著,放牧强度越大冰川棘豆种群盖度越大。气候变化(水热条件变化)以及放牧强度增强可能是导致近年来冰川棘豆迅速蔓延的主要原因,而且,这种影响是交互出现的。

Correlation between Oxytropis galacialis cover and its environmental factors were studied by using two way analyses of variance（ANOVA） and multiple linear regression analyses.The results showed that effect of water on O.galacialis cover was significant（p = 0.01714）.Slope and aspects were highly correlated with O.galacialis cover.O.galacialis cover on south and southwest slope was the highest,while the lowest on northwest slope.Grazing intensity was also significantly correlated to O.galacialis cover with higher cover at highly grazed area.Thus the recent trend of increasing dispersion of O.galacialis might have mainly been caused by the climatic factors that reflect water and heat availability and the daily increased grazing intensity,while the effect of climate and animal grazing on O.galacialis cover was not mutually exclusive.