干旱区生态环境知识资源中心(Arid): 绿洲-荒漠过渡带芨芨草地SPAC系统蒸散与多环境因子关系分析

Arid

	绿洲-荒漠过渡带芨芨草地SPAC系统蒸散与多环境因子关系分析
其他题名	Relationship between evapotranspiration and multi-environmental factors of Achnatherum splendens grassland’ s SPAC system in oasis-desert Ecotone
	闫人华 1; 熊黑钢2 ; 冯振华 3; 张芳 1; 瞿秀华 1
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2013
卷号	36 期号:5 页码:889-896
中文摘要	利用波文比能量平衡法对天山北麓绿洲荒漠过渡带芨芨草地的夏季蒸散量进行测定,采用通径分析与相关分析相结合的方法探讨了蒸散与主要环境因子之间的关系,建立了适合该地区的蒸散预测模型。结果表明:(1)各种环境因子对蒸散影响的大小排序为:净辐射(R_n)>土壤热通量(G)>空气温度(T_气)>空气相对湿度(RH)>5cm土壤温度(T_(-5cm))>实际水汽压(e_a)>风速(V_(wind)) >5 cm土壤含水率(S_(-5cm));(2)各因子通过R_n对蒸散产生的间接作用都大于其自身直接作用,反映出净辐射是制约蒸散大小的主导因子,是决定干旱区蒸散量的关键;(3)土壤热通量对蒸散的直接负效应远小于通过其他因子的间接正效应,出现其直接负效应与综合效应相反的结果;(4)建立并经过检验的蒸散预测模型表明:与温暖湿润区蒸散依靠水、热并重情况不同的是,极端干旱区主要依靠热量因子强度的增加,才能有较大的蒸散量。
英文摘要	The Achnatherum splendens grassland evapotranspiration of oasis-desert ecotone in the northern Tianshan Mountain was calculated using Bowen ratio equilibrium energy method, then the influence of different weather conditions on the relationship between evapotranspiration and environmental factors were analysed, based on the observed meteorological data. Furthermore, evapotranspiration forecasting models were established. The results showed as follows: (1) the significance of impact of environmental factors on evapotranspiration implied that: net radiatio(R_n)>soil heat flux (G)> air temperature>air relative humidity (RH)> 5 cm soil temperature > actual vapor pressure (e_a)> wind speed (V_wind)> 5 cm soil moisture. Therefore, net radiation (R_n), soil heat flux (G), air temperature, and relative humidity (RH) were the four major factors, whose absolute values of the correlation coefficient were above 0.44. However, except for 5 cm soil moisture (S_(soil-5cm)), all the correlation between each climate factor and evapotranspiration reachd a very significant level. (2)The indirect effect of each factor produced by R_n on evapotranspiration was greater than its direct effect, meaning that net radiation is the principal factor determining the scale of evapotranspiration. Especially, the absolute value of indirect effect coefficient of G, air temperature and RH produced by R_n were between 0.4 and 0.74, which were much larger than their own direct coefficients. (3)The direct negative effect of G on evapotranspiration was much smaller than other indirect positive effects, causing its comprehensive effect to be negative. For instance, the indirect effect coefficient of G produced by R_n was up to 0.744 1, which was 3.34 times as big as the direct negative effect, leading to its comprehensive effect being positive. (4) The evapotranspiration forecasting models in which evapotranspiration was chosen as dependent variable and each environmental factor as independent variable, were established with the method of multiple linear stepwise regressions. Established and certified evapotranspiration forecasting model with R_n, G, air temperature only included suggests that greater evapotranspiration of extremely dry area mainly relies on the increased intensity of the heat factor, which is different from warm and humid area relying equally on water and heat factors. The research can deepen the study of regional evapotranspiration model, which provided guidance for evaluation of regional water resources carrying capacity and desertification prevention work.
中文关键词	SPAC系统 ; 绿洲-荒漠过渡带 ; 蒸散 ; 环境因子
英文关键词	SPAC system oasis-desert ecotone evapotranspiration environmental factor
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:4960932
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/2XILL650/229551
作者单位	1.新疆大学资源与环境科学学院, 教育部绿洲生态重点实验室, 乌鲁木齐, 新疆 830046, 中国; 2.北京联合大学应用文理学院城市系, 教育部绿洲生态重点实验室, 北京 100083, 中国; 3.新疆大学经济与管理学院, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	闫人华,熊黑钢,冯振华,等. 绿洲-荒漠过渡带芨芨草地SPAC系统蒸散与多环境因子关系分析[J]. 新疆大学,2013,36(5):889-896.
APA	闫人华,熊黑钢,冯振华,张芳,&瞿秀华.(2013).绿洲-荒漠过渡带芨芨草地SPAC系统蒸散与多环境因子关系分析.干旱区地理,36(5),889-896.
MLA	闫人华,et al."绿洲-荒漠过渡带芨芨草地SPAC系统蒸散与多环境因子关系分析".干旱区地理 36.5(2013):889-896.