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流域作为产水产沙的基本单元,与坡面林地不同,因受多种因子的制约,其产水产沙过程远较单纯林分复杂.1990～1991年,我们在陕西省宜川森林水文生态站,对油松山杨林集水区和坡面油松林、山杨林内径流小区的产流状况进行了连续观测,发现它们在产流所需降水的临界值上不尽一致.观测结果如下:l 集水区和林分基本特征集水区位于黄龙山区宜川县所属铁龙湾林场的松峪沟内,由油松人工林和山杨次生林覆盖,总覆盖度90%以上,其中油松林占60%,山杨林占40%.集水区沟道特征见表1.
As a basic unit of water and sediment production, the basin is different from the slope woodland. Due to the constraints of many factors, the process of water and sediment production in the basin is more complex than that of pure forest. From 1990 to 1991, , The runoff in Yangling catchment area and the Pinus tabulaeformis forest and Populus davidiana forest in Yunshan Mountain were observed continuously and found that they were not consistent in the critical value of precipitation required for runoff.The results are as follows: Catchment and Forest Stands Basic Features Catchment is located in Songyu Gully of Tie Longwan Forest Farm, which belongs to Yichuan County, Huanglong Mountain. It is covered by Pinus tabulaeformis plantation and Populus simonii forest with a total coverage of more than 90%, of which 60 are Pinus tabulaeformis %, Populus euphratica accounts for 40%. Catchment channel characteristics shown in Table 1.