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地边截水地物对黑土区小流域坡长因子计算的影响
尚晨晨1,2, 张天宇1,2, 秦丽杰1,2, 韩笑3
1.东北师范大学 长白山地理过程与生态安全教育部重点实验室, 吉林 长春 130024;2.东北师范大学 地理科学学院, 吉林 长春 130024;3.吉林农业大学 植物保护学院, 吉林 长春 130118
摘要:
[目的] 研究地边截水地物对黑土区小流域坡长因子(L)和土壤侵蚀速率(A)的影响,为提高该地区的土壤侵蚀预报精度提供依据。[方法] 选取2个小流域,结合野外调查和DEM分析,比较不考虑与考虑地边截水地物情况下的L。[结果] 如果不考虑地边截水地物,L平均被高估18%,A平均被高估31%。[结论] 在计算黑土区小流域土壤侵蚀速率时,有必要考虑地边截水地物。在其他因素相同的情况下,坡度越大,横坡分布的地边截水地物的间距越小,越要考虑地边截水地物。
关键词:  土壤侵蚀  坡长因子  沟道  黑土  林带
DOI:10.13961/j.cnki.stbctb.2020.03.044
分类号:S157
基金项目:国家重点基础研究发展计划项目“东北黑土区坡面水土流失综合治理技术”(2018YFC0507005);国家自然科学基金项目“黑土和白浆土浅沟侵蚀土壤阻力参数季节变化研究”(41401304),“吉林省农作物生产水足迹热点区识别及调控研究”(41571526)
Effects of Parcel-Border Features on Slope Length Factor Calculation of Small Watersheds in Black Soil Region
Shang Chenchen1,2, Zhang Tianyu1,2, Qin Lijie1,2, Han Xiao3
1.Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, Northeast Normal University, Changchun, Jilin 130024, China;2.School of Geographical Sciences, Northeast Normal University, Changchun, Jilin 130024, China;3.School of Plant Protection, Jilin Agriculture University, Changchun, Jilin 130118, China
Abstract:
[Objective] The effects of parcel-border features (PBFs) on the calculation of the slope length factor and soil erosion rate of small watersheds in a black soil region were studied in order to provide a basis to improve the precision of soil erosion prediction in the region.[Methods] Two typical small watersheds were selected. Field survey and digital elevation model analysis were used to calculate the slope length factor considering the PBF, and the PBF was ignored.[Results] The slope length factor could be overestimated by 18% and the soil erosion rate by 31%, on average.[Conclusion] It is necessary to consider PBFs for the slope length factor and soil erosion rate calculations of small watersheds in black soil region. Similarly, under other factors, it would be necessary to consider PBFs when the slope gradients are larger and the intervals between cross-slope PBFs are smaller.
Key words:  soil erosion  slope length factor  channel  black soil  forest belt