干旱区生态环境知识资源中心(Arid): 典型荒漠植物沙拐枣茎干液流密度动态及其对环境因子的响应

Arid

	典型荒漠植物沙拐枣茎干液流密度动态及其对环境因子的响应
其他题名	Dynamics of sap flow density in stems of typical desert shrub Calligonum mongolicum and its responses to environmental variables
	徐世琴; 吉喜斌; 金博文
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2016
卷号	27 期号:2 页码:345-353
中文摘要	采用热平衡包裹式茎干液流仪和微气象监测系统,模拟中国西北河西走廊中段荒漠生态系统典型固沙植物沙拐枣2014年69月茎干液流变化过程.结果表明:沙拐枣茎干液流密度日变化呈宽幅单峰型,其峰值滞后于光合有效辐射峰值约30 min,提前于气温和水汽压亏缺峰值约120 min,其日变化与这3个环境因子日变化之间存在非对称性响应.观测期间,茎干液流密度变化与大气蒸腾需求密切相关,光合有效辐射、气温和水汽压亏缺是影响沙拐枣茎干液流密度的主要气象因子.构建的基于茎干液流密度与气象因子响应关系的模型,能够比较准确地模拟不同天气条件沙拐枣液流密度的变化,而且经过时滞校正模型模拟精度进一步提高,但是该模型对低液流密度和夜间液流密度存在低估,这主要与植物的生理特征有关.
英文摘要	Independent measurements of stem sap flow in stems of Calligonum mongolicum and environmental variables using commercial sap flow gauges and a micrometeorological monitoring system, respectively,were made to simulate the variation of sap flow density in the middle range of Hexi Corridor,Northwest China during June to September,2014. The results showed that the diurnal process of sap flow density in C. mongolicum showed a broad unimodal change,and the maximum sap flow density reached about 30 minutes after the maximum of photosynthetically active radiation(PAR), while about 120 minutes before the maximum of temperature and vapor pressure deficit(VPD). During the studying period,sap flow density closely related with atmosphere evaportranspiration demand,and mainly affected by PAR,temperature and VPD. The model was developed which directly linked the sap flow density with climatic variables,and good correlation between measured and simulated sap flow density was observed in different climate conditions. The accuracy of simulation was significantly improved if the time-lag effect was taken into consideration, while this model underestimated low and nighttime sap flow densities,which was probably caused by plant physiological characteristics.
中文关键词	热平衡方法 ; 茎干液流 ; 时滞效应
英文关键词	heat balance method stem sap flow time-lag effect
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:5645402
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/2XILL650/235234
作者单位	中国科学院寒区旱区环境与工程研究所临泽内陆河流域研究站, 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. 典型荒漠植物沙拐枣茎干液流密度动态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,2016,27(2):345-353.
APA	徐世琴,吉喜斌,&金博文.(2016).典型荒漠植物沙拐枣茎干液流密度动态及其对环境因子的响应.应用生态学报,27(2),345-353.
MLA	徐世琴,et al."典型荒漠植物沙拐枣茎干液流密度动态及其对环境因子的响应".应用生态学报 27.2(2016):345-353.