上黄试验区径流泥沙观测

本文系“六五”试验测定资料简结，其结果为（1）坡地水土流失量随坡度增大而增大，但至临界坡度（约30°）则出现减少趋势；（2）在大致相近的坡度下（19～22°），土壤流失量农地（2312t/km²）>退耕草地（981t/km²）>封禁荒坡（67t/km²）>坡面措施植林地（19～24t/km²）；（3）降雨强度大水土流失量大，一次大强度降雨（平均雨强0.46mm/min）可使水土流失量占全年流失量的60%以上。

Observations of Silt Quantity in Runoff at Shanghuang Experimental Field

This paper is a brief summary on the observations of runoff silt at Shanghuang experimental feild during the sixth five-year-plan. Observative results are as follows: l.the quantity of soil and water loss increases along with the rising of slope until the critical angle (30°); 2. at about the same slope (19～22°), the quantity of soil loss is farming land (2 312 t/km²)>grass land removing from plough (981t/km²)>closed slope(67t/km²)>slope land with vegetation(19~24t/km²); 3.the quantity increases when fall intensity of rain is high, one strengthen rain fall (the average fall intensity is 0.46mm/min) could make the loss quantity as high as 60% of whole year’s.