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通过对砒砂岩区西召沟小流域冻融风化侵蚀实测资料的分析,认为砒砂岩区冻融风化侵蚀主要发生在裸露沟谷坡面,其冻融风化侵蚀与砒砂岩的种类有关。与同种砒砂岩相比,种植沙棘7年后,支沟上、中、下游的坡面冻融风化侵蚀模数平均从11748t/km2降为3535t/km2,降低69.9%。单位长度沟沿线与沟角线和的冻融风化侵蚀量平均从0.0974m3/m降为0.004m3/m,降低95.9%。冻融风化侵蚀量占整个沟道总产沙量的百分比上游从76.1%降到52.6%,下游从6.4%升到13.2%。可见沙棘在防止冻融风化侵蚀方面的作用是非常明显的。
Based on the analysis of the data of freeze-thaw weathering in the Xizhaogou small watershed in the Xisha area, it is concluded that the freeze-thaw weathering and erosion in the Xisha area mainly occurs on the slope of the exposed valley. The weathering and erosion of the frozen and thawed landslide are related to the types of sandstone. Compared with the same species of 砒 sandstone, after seven years of seabuckthorn planting, the average module of freeze-thaw weathering and erosion at the upper, middle and lower reaches of the branch ditch decreased from 11748t / km2 to 3535t / km2, decreasing by 69.9%. On the average, the erosion-erosion erosion along the length of the ditch and along the ditch line is reduced from 0.0974m3 / m to 0.004m3 / m on average, decreasing by 95.9%. The percentages of freeze-thaw weathering and erosion on the total channel sediment yield decreased from 76.1% to 52.6% upstream and from 6.4% downstream to 13.2% downstream. Seabuckthorn can be seen in the freeze-thaw weathering erosion prevention role is very obvious.