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黄河中游多沙粗沙区侵蚀产沙与植被相互作用的临界现象
引用本文:王随继.黄河中游多沙粗沙区侵蚀产沙与植被相互作用的临界现象[J].水土保持学报,2004,18(4):20-23,28.
作者姓名:王随继
作者单位:中国科学院地理科学与资源研究所,北京,100101
基金项目:国家自然科学基金黄河联合基金项目(50239080)和国家自然科学基金项目(40271019)资助
摘    要:黄河中游多沙粗沙区是黄土高原境内侵蚀最为强烈的地区,也是下游河道强烈淤积的主要物源区。该区的土壤侵蚀受到多重因素的复合作用,植被作为其最显著的影响因子之一而广受关注。以统计资料为依据,论述了研究区侵蚀模数、林草覆盖度和林木覆盖度的空间分布特征,发现一些相对较大的侵蚀模数与植被覆盖度之间具有良好的非线性关系。将这些相对较大的侵蚀模数定义为极端侵蚀模数——相似植被覆盖度条件下的最大侵蚀模数,并拟合出它们与林草和林木覆盖度之间的定量函数关系,得出极端侵蚀模数由增加到减小的临界林草覆盖度为24.2%,临界林木覆盖度为12%。这就是说,在其它复合因素不发生明显改变的情况下,当研究区林草覆盖度小于24.2%或林木覆盖度小于12%时,极端侵蚀模数随着林草或林木覆盖度的增大而增大;当覆盖度大于上述临界值后,极端侵蚀模数则随之减小。该研究成果对于更有效地管理黄河中游流域具有一定的指导意义。

关 键 词:侵蚀模数  林草覆盖度  林木覆盖度  相互关系  临界
文章编号:1009-2242(2004)04-0020-04

Interaction Threshold between Soil Erosion and Vegetation Cover at Coarse Sediment Source Area with High Concentration, Middle Yellow River Basin
WANG Sui-ji.Interaction Threshold between Soil Erosion and Vegetation Cover at Coarse Sediment Source Area with High Concentration, Middle Yellow River Basin[J].Journal of Soil and Water Conservation,2004,18(4):20-23,28.
Authors:WANG Sui-ji
Abstract:The coarse sediment source area with high concentration of middle Yellow River Basin is the most strong erosion area of the Loess Plateau, and is a main source of coarse suspended sediments which led strong sedimentation at the lower Yellow River. The soil erosion in this area is influenced by multiple factors. Vegetation as a main factor has been paid close attention. In this work the spatial distribution of the erosion modulus, forest cover and total forest and grass cover was discussed. Some non-linear relationship between some high erosion modulus and vegetation cover seems existent. The high erosion modulus was defined as the extreme erosion modulus: the maximum erosion modulus under a similar vegetation cover condition. From the relationships between extreme erosion modulus and vegetation cover, the threshold value of 24.2% for the total forest and grass cover, and 12% for the forest cover was obtained. It means that, if the other multiple factors do not change remarkably, the extreme erosion modulus increases with the increase of forest cover or total forest and grass cover when the forest cover is lower than 12% or the total forest and grass cover is lower than 24.2 %, then it decreases with the increase of the covers. This result may be helped us to manage the middle Yellow River basin efficiently.
Keywords:erosion modulus  total forest and grass cover  forest cover  interrelation  threshold
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