黄土丘陵林区开垦地土壤抗冲性的时间变化研究
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国家自然科学基金重点项目(19832060)


Temporal Change of Soil Anti-scourability of Reclaimed Lands in Loess Hilly Forest Region
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    摘要:

    以黄土丘陵林区10a径流泥沙观测资料为基础,进行土壤抗冲试验,分析了林地及其开垦后不同年限土壤的抗冲性能。结果表明,林地具有很强的抗冲性能,一旦被开垦后,随侵蚀年限的增长,土壤的抗冲性呈减弱趋势,在3L/min流量下,土壤冲刷量从侵蚀1a的4.01g/L增大到侵蚀 10a的 25.51g/L,加剧了土壤侵蚀发展。相关分析表明,土壤的抗剪强度对抗冲性影响最大,其次为水稳性团粒和有机质含量。因此,退耕还林、恢复和重建植被,改善土壤侵蚀环境,提高土壤抗冲性,能有效地防治土壤侵蚀。

    Abstract:

    Using the 10 year observed data of runoff and sediment in the loess hilly forest region and the field antiscourability tests,the anti-scourability in the forest-land and the reclaimed lands were analyzed. The results showed that the forest-land had the strong anti-scourability. After reclaimed,the anti-scourability of reclaimed lands had the decrease tendency from 4.01g/L to 25.51g/L in the flow of 3 L/min,which would increase the soil erosion intensity. Correlation analyses found that the soil shear strength had the biggest effect on soil anti-scourability,and then,the water stable aggregate and the organic content. So it could control effectively soil erosion to return reclaimed lands into forest or grass land,and recover or reconstruct vegetation.

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查小春,唐克丽.黄土丘陵林区开垦地土壤抗冲性的时间变化研究[J].水土保持通报,2001,(2):8-11

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  • 收稿日期:2000-12-20
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  • 在线发布日期: 2014-11-28
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