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坡面土地利用方式与产流、产沙及土壤有机碳的流失具有密切关系。对延安燕沟流域的坡耕地、草地、刈割草地、灌木地、刈割灌木以及刺槐林地径流小区的径流、泥沙及有机碳流失量进行了分析。结果表明:在不同土地利用方式下,产流、产沙量与植被覆盖度呈负相关关系;随径流流失的可溶性有机碳量表现为:坡耕地>刈割草地>草地>刈割灌木地>灌木地>刺槐林地小区,随泥沙流失的有机碳量表现为:坡耕地>草地>灌木>刺槐林地。随泥沙流失的土壤有机碳占总流失量的主要部分,而随径流流失的有机碳只占很少的比例。因此,增加黄土坡面植被覆盖度是控制产流、产沙量和有机碳流失的重要途径。
Land use patterns on slope are closely related to runoff and sediment yield and the loss of soil organic carbon. The runoff, sediment and organic carbon loss of sloping farmland, grassland, mowing grassland, shrub land, mowing shrub and Robinia pseudoacacia forest runoff in Yan’aogou watershed of Yan’an were analyzed. The results showed that there was a negative correlation between runoff and sediment yield and vegetation coverage under different land use patterns. The amount of dissolved organic carbon lost by runoff was as follows: sloping cropland> mowing grassland> grassland> cutting shrub land> Shrub land> Robinia pseudoacacia forestland area, the amount of organic carbon loss with sediment is as follows: sloping land> grassland> shrub> locust locust. Soil organic carbon lost with sediment accounted for a major portion of the total loss, while organic carbon lost to runoff accounted for only a small proportion. Therefore, increasing vegetation coverage of loess slopes is an important way to control runoff, sediment yield and organic carbon loss.