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目前,土壤流失通用方程中的可蚀性因子K与土壤在系列级上的分类有关.在美国的11,000个土系中,大多数已确定了K值以及表层和底土的质地相.威斯奇迈耶的诺漠图仅利用已知的大多数土系的土壤特性,所以它尤其要为这个目的服务.成千上万的算例,通过诺谟图描绘到要求的精度..可是,在一些算例中,诺谟图的K值与观察值并不一致.突出的例子是夏威夷和波土里可(Puerto Rico)的土壤,这些土壤与用于绘制诺谟图的土壤差别很大.另外的例子是由火山作用所引起的岩灰影响的各种土壤以及许多裸露的底土.在拍西菲克(Pactific)西北的部分地区,
At present, the erodibility factor K in the universal equations of soil loss is related to the classification of soil at the series level, and most of the 11,000 soils in the United States have established the K value and the texture of the top and bottom soil. In particular, the Meyer’s Moorig map uses only the soil characteristics of most of the known soils, so it serves this purpose in particular .Thousands of examples are plotted to the required accuracy through the nomogram .. However, In some cases, the K value of the nomogram is not consistent with the observed value, with prominent examples being the soils of Hawaii and Puerto Rico that are quite different from the soil used to draw the nomogram Examples are the various soils affected by rock dust caused by volcanic activity and the many exposed subsoils.In parts of northwest Pacietic,