Spatiotemporal Variation of Soil Moisture Content in the Soft-rock Loess Gully
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    Abstract:

    A special loess gully type,soft-rock loess gully,is distributed in the border area of Shanxi,Shaanxi,and Inner Mongolia,in which water loss and soil erosion are serious.In the study,soil moisture characteristics in the soft-rock loess gully were measured and analyzed.The main results are as follows:(1) In midsummer(July),the averaged soil moisture content of the various parts of the gully was obviously different.The order of landform units from high to low,in terms of soil moisture content,was the bottom of gully(14.44%),the top of sunny slope(9.29%),the top of shady slope(9.01%),the middle of shady slope(8.25%),and the middle of sunny slope(6.36%).While in late autumn(October),the order was the bottom of gully(9.96%),the top of shady slope(9.81%),the middle of sunny slope(9.48%),the middle of shady slope(9.09%),and the top of sunny slope(8.06%).(2) The averaged soil moisture content of soft-rock appeared no obvious seasonal change,but an obvious seasonal change in the averaged soil moisture content was found in loess materials.(3) Water content of mudstone was significantly higher than sandstone along the profile of soft-rock.Moreover,water storage capacity of soft-rock on gentle slope was greater than steep slope.(4) An obvious phenomenon of dried soil layer appeared in the loess profiles.Under low precipitation in summer and autumn,soil moisture seriously was decreased,which was a negative compensation.So,the thickness of dried soil layers was increased.Therefore,dried soil layer is a natural phenomenon in the soft-rock loess gully area of semiarid region and its growth and declination follow the changes of rainfall.

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赵利清,杨劼,张璞进,宋炳煜.砒砂岩-黄土沟谷土壤含水量的时空变化[J].水土保持通报英文版,2009,(1):56-61

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History
  • Received:May 22,2008
  • Revised:July 21,2008
  • Adopted:
  • Online: November 26,2014
  • Published: