干旱区生态环境知识资源中心(Arid): 新疆艾比湖湿地自然保护区胡杨根系水分再分配的估算

Arid

	新疆艾比湖湿地自然保护区胡杨根系水分再分配的估算
其他题名	Estimation of hydraulic redistribution of Populus euphratica in Ebinur Lake Wetland Nature Reserve in Xinjiang Uygur Autonomous Region,China
	杨晓东; 吕光辉
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2011
卷号	35 期号:8 页码:816-824
中文摘要	根据对新疆艾比湖湿地自然保护区荒漠河岸林的主要建群种胡杨(Populus euphratica)的根系分布特征,林冠下土壤的饱和容积含水量、最大导水率和根系最大导水率的试验观测数据,以及对其林冠下5层不同深度土壤容积含水量、土壤水势的动态监测数据,构建了胡杨根系水分再分配量估算的Ryel模型,并对胡杨不同季节的水分再分配过程进行了短期模拟。结果表明:(1)胡杨根系水分再分配过程的水分再分配量的最大值出现在艾比湖地方时间凌晨2:30。(2)随着生长季节的变化,胡杨根系水分再分配的作用逐渐减弱,并表现出向土壤下层迁移的现象。6月份,水分再分配过程主要发生在0-40cm土层,最大分配量为0.0220cm,夜间总分配量为0.1110cm;8月份水分再分配过程主要发生在10-70cm土层,最大分配量为0.0065cm,夜间总分配量为0.0184cm;10月份水分再分配过程主要发生在70-100cm土层,最大分配量为0.0039cm,夜间总分配量为0.0086cm。
英文摘要	Aims Our objective was to construct and use a Ryel model to quantify hydraulic redistribution of Populus eu-phratica,a species in desert riparian vegetation.Methods We constructed a Ryel model to estimate the amount of net water redistribution under the canopy of P.euphratica.We based the model on data from studies measuring the shape and distribution of roots under the canopy of P.euphratica and observing values for volumetric water contents (thetas),saturated hydraulic conductivity (Ks),maximum radial soil-root conductance of the entire active root system for water (CRT),soil water potential (psii)and residual volumetric water contents (thetar)in five soil layers.We used this model to make a short-term simu-lation of root hydraulic redistribution in different seasons.Important findings Hydraulic redistribution under the canopy of P.euphratica reached a maximum at 2:30 am.The amount of net water redistribution under the canopy decreased and moved towards the underlying soil with changes in the growing season.In June,hydraulic redistribution mainly occurred in the 0-40 cm soil layer,the maximum amount of redistribution was 0.022 0 cm and the total at night was up to 0.111 0 cm.In August,hy-draulic redistribution mainly occurred in the 10-70 cm soil layer,the maximum amount of redistribution was 0.006 5 cm and the total at night was up to 0.018 4 cm.In October,hydraulic redistribution mainly occurred in the 70-100 cm soil layer,the maximum amount of redistribution was 0.003 9 cm and the total at night was up to 0.008 6 cm.
中文关键词	艾比湖湿地自然保护区 ; 水分再分配 ; 胡杨 ; Ryel模型
英文关键词	Ebinur Lake Wetland Nature Reserve hydraulic redistribution Populus euphratica Ryel model
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:4265617
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227374
作者单位	新疆大学资源与环境科学学院, 绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	杨晓东,吕光辉. 新疆艾比湖湿地自然保护区胡杨根系水分再分配的估算[J]. 新疆大学,2011,35(8):816-824.
APA	杨晓东,&吕光辉.(2011).新疆艾比湖湿地自然保护区胡杨根系水分再分配的估算.植物生态学报,35(8),816-824.
MLA	杨晓东,et al."新疆艾比湖湿地自然保护区胡杨根系水分再分配的估算".植物生态学报 35.8(2011):816-824.