摘要
测定了青海省三江源地区土壤有机质与砷含量,并采用普通克里格插值方法研究其空间分布特征,结果显示:三江源地区土壤有机质含量多分布于3.0%～6.0%之间,约占样本总数的68%,超过7%的样品比例约为4%;土壤砷含量主要集中在0～10mg/kg之间,约占样本总数的50%,含量超过30mg/kg的样品比例为20%。土壤有机质含量与海拔之间存在显著负相关(r=-0.346,P<0.05),线性拟合方程为y=-0.042x+4.87(R2=0.11,P<0.05);土壤砷含量与海拔、土壤有机质含量之间均没有显著相关性。土壤有机质含量的块金效应为43.98%,存在中等程度的空间自相关关系;土壤砷含量的空间相关性强,块金效应为23.94%。土壤有机质和砷含量在大尺度上都存在比较明显的空间分布特征。
The spatial distribution pattern of soil organic matter（SOM） and arsenic content was studied with Kriging method in the source region of Yangtze River and Yellow River.The results showed that SOM content was mostly within the range of 3.0%～6.0%,accounting for about 68% of total soil samples.Those with SOM content higher than 7% occupied about 4% of total samples.Approximate 50% of soil samples had As content between 0～10mg/kg.The percentage was almost 20% for those with As content higher than 30mg/kg.SOM content showed significantly negative correlation with altitude（r =-0.346,P0.05）,which could be fitted by the equation y =-0.042x ＋ 4.87（R2 = 0.11,P0.05）.Soil As content,however,did not significantly correlate with either altitude or SOM.Spatial statistics indicated that the nugget effect was 43.98% for SOM content,and 23.94% for soil As content.The results suggested that there was medium auto-correlation for SOM content and significant auto-correlation for soil As content at large spatial scale in the source region of Yangtze River and Yellow River.
出处
《中国草地学报》
CSCD
北大核心
2012年第5期24-29,共6页
Chinese Journal of Grassland
基金
中国科学院战略性先导科技专项资助(XDA05050404)
青海省自然科学基金项目(2012-Z-921Q)
关键词
三江源地区
土壤有机质
砷
克里格插值
Source region of Yangtze River and Yellow River
Soil organic matter
As
Kriging
