干旱区生态环境知识资源中心(Arid): 科尔沁沙地沙丘-丘间低地降雨前后土壤水分分布特征

Arid

	科尔沁沙地沙丘-丘间低地降雨前后土壤水分分布特征
其他题名	Soil water distribution before and after a rainfall event at sand dune-interdunes in Horqin Sandy Land,Northern China
	周学雅; 杨婷婷; 王安志; 关德新; 袁凤辉; 吴家兵; 金昌杰
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2017
卷号	36 期号:1 页码:157-163
中文摘要	以科尔沁沙地固定沙丘-丘间低地景观单元为研究对象,在植被生长旺盛期且长时间干旱条件下,对中等降雨(22.6 mm)前后不同微地形土壤水分分布特征和降雨补给情况进行分析。结果表明: 水平方向上,降雨前后不同部位0~90 cm深度平均土壤水分有显著差异,雨前其大小顺序为丘间低地(10.30%)>沙丘下部(1.18%)>沙丘顶部>(0.98%)>沙丘上部(0.75%);雨后沙丘顶部、上部、下部和丘间低地土壤水分分别增加了2.33、3.50、 1.77和0.34个百分点;垂直方向上,降雨前后土壤水分的深度分布与水平位置有关;雨前表层土壤水分均很小,沙丘顶部、上部分别在40~100、20~50和120~200 cm深度有较弱的高值区,沙丘下部和丘间低地土壤水分随深度增大,直至饱和含水量;雨后沙丘顶部、上部、下部、丘间低地土壤储水量增加的深度范围分别是0 ~110、0 ~110、0 ~50和0 ~90 cm,其储水量增量分别占降雨的12.4%、13.3%、9.7%和14.6%,其中丘间低地0 ~10 cm土层储水量增量显著高于沙丘顶部和上部,其他深度不同部位储水量增量差异不显著(P<0.05);在长时间无降雨条件下,沙丘顶部和上部土壤水分状况趋于恶化,有必要采取一定间伐措施,使土壤水分维持动态平衡,才有利于植被恢复和沙漠化逆转。
英文摘要	In this paper,a typical landscape unit,dune-interdune in Horqin Sandy Land was selected as study object,and the characteristics of soil moisture distribution and rainfall recharge along terrain before and after a moderate rainfall event (22.6 mm) were analyzed. The results showed that,in the horizontal direction,there were significant differences among the mean soil moisture content (SMC) of 0-90 cm depth at different locations. Before rainfall,the order of SMC at different locations was interdune (10.30%), downslope (1.18%), dune top (0.98%) and upslope (0.75%);after rainfall,the rate of SMC increment was 2.33% for dune top,3.50% for upslope,1.77% for downslope and 0.34% for interdune. In the vertical direction,soil moisture distribution with depth before and after rainfall was related with locations. Before rainfall, surface SMC was quite low and mean SMC was slightly higher at 40-100 cm depth of dune top, and at 20 - 50 cm and 120 - 200 cm depth of upslope. At downslope and interdune,SMC increased with depth up to saturated values. After rainfall,soil water storage increased at 0-110 cm,0-110 cm,0-50 cm and 0-90 cm depth at dune top,upslope,downslope and interdune, which were 12.4%,13.3%,9.7% and 14.6% of rainfall,respectively. At 0-10 cm layer,soil water storage increment at interdune was significantly higher than that of dune top and upslope, and there were no significant differences at other layers among different locations (P<0.05). During the period with no rain for long time,soil water at dune top and upslope was in deficit,and it is necessary to take measures to maintain a dynamic balance in soil water,which is good for vegetation restoration and desert reversal.
中文关键词	土壤水分空间分布 ; 土壤储水量变化 ; 降雨补给
英文关键词	soil moisture spatial distribution soil water storage dynamics precipitation recharge
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5897128
来源机构	中国科学院沈阳应用生态研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236545
作者单位	中国科学院沈阳应用生态研究所, 沈阳, 辽宁 110016, 中国
推荐引用方式 GB/T 7714	周学雅,杨婷婷,王安志,等. 科尔沁沙地沙丘-丘间低地降雨前后土壤水分分布特征[J]. 中国科学院沈阳应用生态研究所,2017,36(1):157-163.
APA	周学雅.,杨婷婷.,王安志.,关德新.,袁凤辉.,...&金昌杰.(2017).科尔沁沙地沙丘-丘间低地降雨前后土壤水分分布特征.生态学杂志,36(1),157-163.
MLA	周学雅,et al."科尔沁沙地沙丘-丘间低地降雨前后土壤水分分布特征".生态学杂志 36.1(2017):157-163.