陕北黄土区土壤水分养分空间分异规律

Spatial Variation of Soil Water and Nutrient Content on Loess Slope in Shanbei China

黄土高原生态脆弱 ,沟壑纵横 ,水土流失非常严重。西部大开发 ,黄土高原植被建设要先行。植被建设又受当地土壤水分、养分等条件的制约。坡向、坡位对水分、养分的分布有重要影响 ,因而研究陕北黄土高原土壤水分、养分的空间变异规律 ,对于黄土高原植被建设具有重要意义。本文通过研究黄土高原不同坡向、坡位土壤水分、养分的空间变异规律 。

A field study of distribution of soil water and nutrient content in different direction and location in Shanbei China was carried out to make clear the characteristics which can be used for the ecological reconstruction on the loess in Shanbei which lies in the north of Loess Plateau. As is known, the vegetation overlay is few, it having a brittle entironment. The badly vegetation construction resulted in the serious loss of soil and water in this region. So it is necessary to reconstruct the vegetation on Loess Plateau, especially in Shanbei. But the vegetation construction is limited by the distribution of soil water and nutrient in a large degree. So it is important to research the spatial distribution on slope. In this paper a whole loess hill was selected to study the variability of soil water and nutrient. The results indicated that the soil nutrient content among most of sampling points was below the normal level and the soil water content also very low. The souting was lower than that in any other direction not only in soil nutrient content but also in soil water content in general. The distribution of water and nutrient on slope in different depth was also different. The soil nutrient content mainly concentrated in 0cm～10cm. The result also showed that it is important for the reconstruction of vegetation on Loess Plateau to supply enough water and nutrient.