巴丹吉林沙漠周边地区土壤养分和粒度特征

Characteristics of soil nutrients and grain size around Badain Jaran Desert

选取巴丹吉林沙漠周边8个典型地貌区域,开展不同深度土壤养分和粒度组成特征及空间异质性研究。结果表明:(1)巴丹吉林沙漠周边区域土壤养分和粒度空间异质性较强,整体上土壤贫瘠,全钾含量中等;电导率变异性最大,pH的变异性较弱,其他因子属于中等变异。土壤整体上细沙含量最高,0-20 cm层黏土和极粗沙含量的变异系数较高;20-40 cm层黏土、粉沙和极粗沙含量的变异性强。(2)0-20 cm层全氮、全磷、速效磷、速效钾含量和电导率区域差异显著;20-40 cm层全氮和速效钾含量的区域差异显著。0-20 cm层各粒级含量均有显著的区域差异;20-40 cm层极细沙、中沙和粗沙含量的区域差异显著。(3)0-20 cm和20-40 cm层以细沙为界限,小于细沙颗粒的物质与养分含量普遍表现为正相关关系,而大于细沙颗粒的物质与养分的关系普遍呈负相关关系。

Through field investigation in the marginal zone of the Badain Jaran Desert,soil samples of 0-20 cm and 20-40 cm in 8 study areas were collected to analyze the characteristics of soil nutrients and grain size at different depths and regional differences in this paper. The results showed that:(1)The soil nutrients and grain size around Badain Jaran Desert show spatial variability. The soil is poor,and the content of TK is at a medium level.The CV of EC is the largest,and pH variability is weak,and other factors belong to medium variation level. The content of fine sand particles is the highest in the study area. In 0-20 cm layer,the CV of clay and very coarse sand is high. The CV of clay,silty sand and very coarse sand is strong in the 20-40 cm layer.(2)In 0-20 cm layer,there are significant regional differences in TN,TP,AP,AK,EC and all particle sizes. In the 20-40 cm layer,the regional differences of TP,AK and very fine sand,medium sand,coarse sand are significant.(3)In0-20 cm and 20-40 cm layers,the matters smaller than fine sand particles are generally positively correlated with nutrient content,while the matters larger than fine sand particles are generally negatively correlated with nutrient content.