干旱区生态环境知识资源中心(Arid): 典型固沙植物梭梭生长季蒸腾变化及其对环境因子的响应

Arid

	典型固沙植物梭梭生长季蒸腾变化及其对环境因子的响应
其他题名	Dynamics and responses of sap flow of typical sand binding plants Haloxylon ammodendron to environmental variables
	徐世琴; 吉喜斌; 金博文
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2015
卷号	39 期号:9 页码:890-900
中文摘要	蒸腾是植物重要的生理活动之一, 受到多个环境要素的综合影响。该文利用热平衡包裹式茎干液流仪Flow32监测系统, 对河西走廊中段绿洲-荒漠过渡带主要固沙植物梭梭(Haloxylon ammodendron)生长季的蒸腾过程进行连续监测, 并分析了其对环境要素的响应。结果表明: (1)梭梭茎干液流速率随枝直径的增加而增加, 液流密度随枝直径的增加而降低, 梭梭液流密度日变化呈多峰特征, 整个生长季液流密度变化比较稳定。(2)主成分分析表明第1、2、3主成分能够分别解释环境信息49%、15%、12%的变化, 第一主成分中水汽压亏缺、光合有效辐射及气温反映了大气的蒸腾需求。(3) S型模型对液流密度日变化模拟精度达到0.86, 考虑时滞效应后模拟精度提高至0.9, 降水天气条件下模拟精度降低至0.65。(4)液流密度对主要环境要素存在非对称响应, 同光合有效辐射呈逆时针环状, 同水汽压亏缺、蒸腾需求指数呈顺时针环状。
英文摘要	Aims Transpiration is one of important physiological activities for plants, which is regulated by many environmental variables. Our objectives were to understand the responses of sap flow density of Haloxylon ammodendron to environmental variables and simulate its diurnal change under different micrometeorological conditions. Methods Sap flow in stems of H. ammodendron was measured with stem heat balance method using commercial sap-flow gauges from May to October, 2014, in the oasis-desert ecotone, located in the middle range of Hexi Corridor, Northwestern China. Important findings Sap flow velocity of H. ammodendron exhibited a positive relationship with stem diameter, but sap flow density (J_s) decreased with stem diameter. The first three axes of principal component analysis (PCA) explained 49%, 15%, 12% of variances in the environmental datasets, respectively, and vapour pressure deficit (VPD), photosynthetically active radiation (PAR), temperature in the first axes indicated the atmospheric evaporative demand. A sigmoid function could explain 86% of the variation in J_s in typical sunny days, while only 65% on rainy days. It was worth noting the simulated J_s using the established sigmoid function agreed well with the measurements (R~2 = 0.90) if the time lags of J_s to principle environmental variables were taken into consideration. Plots of 30-min J_s against PAR, VPD, and evaporative demand index (EDI) revealed a counter-clockwise hysteresis for PAR, but a clockwise hysteresis for VPD and EDI, it was possibly affected by water stress and time lags of sap flow density to principle environmental variables.
中文关键词	热平衡方法 ; 非对称响应 ; 主成分分析 ; 模拟 ; 茎干液流
英文关键词	heat balance method hysteresis principle component analysis simulation stem sap flow
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5524927
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233629
作者单位	中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	徐世琴,吉喜斌,金博文. 典型固沙植物梭梭生长季蒸腾变化及其对环境因子的响应[J]. 中国科学院西北生态环境资源研究院,2015,39(9):890-900.
APA	徐世琴,吉喜斌,&金博文.(2015).典型固沙植物梭梭生长季蒸腾变化及其对环境因子的响应.植物生态学报,39(9),890-900.
MLA	徐世琴,et al."典型固沙植物梭梭生长季蒸腾变化及其对环境因子的响应".植物生态学报 39.9(2015):890-900.