坡位对沟道土壤性质空间异质性的影响

THE INFLUENCE OF SLOPE POSITION ON THE SPATIAL HETEROGENEITY OF SOIL PROPERTIES OF CHANNEL

在典型草原区多伦县水泉小流域选取典型沟道,在沟道内从沟头到沟口选择3个坡面进行土壤采样,研究沟道内坡位对草地生长状况及土壤性质空间异质性的影响,结果表明:①含水率在坡底最低,但变化幅度最大,且越靠近沟口含水率越低。②坡位对土壤容重的影响与坡面在沟道的位置有关,其中坡底土壤容重比其他坡位明显偏高。③对于有机质和全氮,坡位对两者的影响完全一致,呈现一定的规律。坡位对全磷和全钾的影响各不相同,其中坡位对全钾的影响较小,可能与土壤自身的结构和沟道侵蚀有关。

This research selected a typical channel from a small watershed that called ShuiQuan, which is located in typical steppe area in DuoLun prefecture, and gathered the surface＇s soil samples from three slope surfaces which selected in the channel from gully head to gully mouth, and in order to research the influence of slope position on grass＇s growth condition and spatial heterogeneity of soil properties of channel. The results of this research indicate that ： （ 1 ） Moisture content in bottom is the lowest, but changing range is the largest, furthermore, the more close to gully mouth, the lower moisture content. （2） That slope position impact on volume weight of soil related with location of slope surface in channel, volume weight of soil is obvious higher than other slope positions in the bottom. （3） The influences of slope position on organic matter and total nitrogen were same, and presenting a certain rule. The influences of slope position on total phosphorus and total potassium were not consistency, and total potassium was less influenced by slope position, the structure of the soil and channel erosion may be related.