摘要
根据对砖窑沟流域 6 2个点 9个层次的取样分析数据 ,运用地统计学方法探讨了流域土壤碳酸盐碳的空间变异和分布特征。结果表明 :除 80～ 10 0cm层外 ,其余各层均属中等程度的变异 ,该变异主要是由空间自相关因素引起的。同层次内 ,梁峁顶部土壤碳酸盐碳含量最高 ,沟坝地的含量最低 ;梁峁顶部和沟坝地较梁峁坡地碳酸盐碳含量变化小。地貌部位不同 ,碳酸盐碳在剖面上的淀积深度不同。以淀积层为界 ,沟坝地上部比下部的碳酸盐碳含量略低 ,梁峁坡地上部与下部的碳酸盐碳含量大体相当 ,而梁峁顶部上部比下部的碳酸盐碳含量略高。
The Zhuanyaogou River watershed is located in the central-western part of Hequ County,Shanxi Province,i.e.,39°11′06″～39°13′47″N,111°12′03″～111°19′28″E,it is a first-grade tributary of the Yellow River,its catchment area is 28.7 km 2,and its gully density is as high as 6.2 km/km 2. The climate here belongs to the warm-temperate continental monsoon climate,the annual air temperature is 8.8℃,and the annual precipitation and evaporation are 447.5 mm and 1 913.7 mm respectively. The natural vegetation is sparse and the soil erosion is serious in the region. In this paper,the spatial variability and distribution characteristics of soil carbonate carbon in the watershed are researched by analyzing the soil samples sampled from 62 sampling sites at 9 soil layers in the watershed and by using geostatistical method. The results show that the spatial variability of carbonate carbon content in soil is in a mid-intensity except that in the soil layer of 80～100 cm in depth,and it is caused by the spatial self-correlative factors. The carbonate carbon content in soil is the highest on the top of hills and the lowest in the gullies in the same soil layer. Moreover,the change of the carbonate carbon content in soil at these two geographical locations is smaller than that on the slopes of hills. The illuviation depth of carbonate carbon in soil is different from the different geographical locations. Taking the illuviation layer as the boundary,the carbonate carbon content is lower in topsoil than that under it in the gullies;it is similar in topsoil and under it on the slopes;and it is higher in topsoil than that under it on the top of hills.
出处
《干旱区地理》
CSCD
北大核心
2004年第2期166-171,共6页
Arid Land Geography
基金
国家自然科学基金项目 (4 99710 40 )资助
