干旱区生态环境知识资源中心(Arid): 绿洲－荒漠交错带土壤水分变化特征初步研究

Arid

	绿洲－荒漠交错带土壤水分变化特征初步研究
其他题名	Preliminary research on changing soli water characters at ecotone between oasis and desert
	贾宝全 1; 慈龙骏 1; 蔡体久 2; 高志海 3; 丁峰 3
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2002
卷号	26 期号:2 页码:203-208
中文摘要	以甘肃省的民勤绿洲为例，选择土壤水分最为亏缺的7月，对白刺（Nitraria tangutorum)沙包不同迎风面，以及绿和荒漠交错地带的土壤水分进行了取样分析。结果表明，对于白刺沙包而言，其上层和深层土壤水分是迎风坡大于背风坡，中间层次（40－80cm)则刚好相反。在绿洲与荒漠的交错带上，灌丛沙包与沙丘间低地水分变化在很大的不同，总体而言，丘间地水分含量灌丛沙包，但在距离绿洲406m处，二者均出现一个土壤水分的最低值。在丘间地表层，水分变化是距离绿洲愈近，土壤含水量愈高；而深层土壤水分的变化趋势则刚好相反。在灌丛沙包上，其土壤水分大多在1．5％左右，远低于植物的萎蔫系数，故不能够满足植物生命活动之需；在绿洲至流动沙丘这一环境梯度带，其水分变化可以明显划分为3个区间。基本规律是，愈靠近绿洲，土壤含水量也愈高；而随着与绿洲距离的逐渐拉大，其深层含水量增加、各土层之间的含水量差值也在逐步增大。在丘间地与灌丛沙包底部接触处的丘间地上层，存在一个20cm厚度的高含水层，这一层次为灌丛植物在年内气候干旱期的生命维持提供着重要水源保证。
英文摘要	The soil water content of shrub sand dune of Nitmria tangutorum and takyr among sand dunes between oasis and desert towards various wind directions near Minqin Oasis of Gansu Province was sampled and analyzed in July when the soil water is most deficient. The results indicate that to the Nitraria tangutorum shrub in sand dune, soil water content in the surface layer and the deep layer towards windward is more than that on the leeward ; the situation is opposite in the middle layer (40 - 80 cm) . In the surface layer of sand dunes, the soil water content is higher nearer to the oasis, but the trend of soil water content is opposite in the deep layer , There is a great difference of soil water condition between the shrub sand dunes and the takyr soil. In general, the water content in takyr soil is more than that in shrub sand dunes, however, there exist minimal water content in these two areas at a distance of 406 m from the oasis along the gra-dient from oasis to shift sand dune. In the surface layer of takyr soil, the closer to the oasis, the higher content of soil water, but the varying trend of water content in deep layer is opposite. On areas of shrub sand dunes, soil water content is only 1.5%, a level insufficient for plant growth . Along the gradient zone of ecotone between oasis and desert, 3 zones can be divided clearly by the change of soil water content. Generally, the nearer to the oasis , the higher the soil water content; and with the extending of distance, the soil water content both in the deep layer and among each layers are grad-ually increased. There is a 20 cm soil layer with high water content in the takyr soil, which is situated under the shrub sand dune . The high soil water content enables the shrub plant to survive a very arid period of every year.
中文关键词	交错带 ; 绿洲 ; 荒漠 ; 土壤水分 ; 年内干旱期
英文关键词	ecotone oasis desert, soil water annual arid period
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:1115712
来源机构	北京林业大学 ; 甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203584
作者单位	1.中国林业科学院林业研究所, 北京 100091, 中国; 2.北京林业大学水土保持学院, 北京 100083, 中国; 3.甘肃省治沙研究所, 武威, 甘肃 733000, 中国
推荐引用方式 GB/T 7714	贾宝全,慈龙骏,蔡体久,等. 绿洲－荒漠交错带土壤水分变化特征初步研究[J]. 北京林业大学, 甘肃省治沙研究所,2002,26(2):203-208.
APA	贾宝全,慈龙骏,蔡体久,高志海,&丁峰.(2002).绿洲－荒漠交错带土壤水分变化特征初步研究.植物生态学报,26(2),203-208.
MLA	贾宝全,et al."绿洲－荒漠交错带土壤水分变化特征初步研究".植物生态学报 26.2(2002):203-208.