用^(32)P示踪法研究昆明市水土流失的规律

Study of Circumstances of Hill Soil Erosion in Kunming by Used ^(32)P

应用32P研究山地水土在不同时间、坡度、方向、深度、距离的吸收和分布规律。结果表明:1g山地土壤对32P的吸收随着深度、距离的增加而减小。土壤对32P的吸收率的最大距离为3470.7969×10-5%,最小为1.2097×10-5%;最大深度为2407.9855×10-5%,最小为0.4752×10-5%。在坡度上,磷的吸收率呈波形变化,即在15°～30°,50°～80°时随坡度的增加而减小,在30°～40°时无明显变化,在40°～50°时随坡度的增加而增加。32P的吸收率与距离、坡度、方向呈显著负相关。

The absorption and distribution of phosphate in water and soil of fields are studied at different time,slope,direction,depth and distance by using32P.Results showed:the percent of absorption decrease with the increasing of distance and depth. The distance: maximum is 3 470.796 9×10-5%, minimum is 1.209 7×10-5%; And for the depth:maximum is 2 407.985 5×10-5%, minimum is 0.475 2×10-5%.And for the slope, From 15° to 30°and 50° to 80°degrees increasing; 30° to 40°stable;40° to 50° decreasing. The percent of absorption and slope direction,distance,depth both were minus positive correlation. 