Arid
DOI10.1371/journal.pone.0131683
The Sap Flow Dynamics and Response of Hedysarum scoparium to Environmental Factors in Semiarid Northwestern China
Deng, Jifeng1; Ding, Guodong1,2; Gao, Guanglei1,2; Wu, Bin1,2; Zhang, Yuqing1,2; Qin, Shugao1,2; Fan, Wenhui1
通讯作者Ding, Guodong
来源期刊PLOS ONE
ISSN1932-6203
出版年2015
卷号10期号:7
英文摘要

Hedysarum scopariumis an important, fast-growing and drought-resistant shrub that has been extensively used for grassland restoration and preventing desertification in semiarid regions of northwestern China. The primary objective of this study was to investigate the diurnal and seasonal variations in stem sap flow (J(s)) and its relation to environmental factors. The stem heat balance method was applied to plants that were approximately 17 years old (with diameters of 25, 16, 13, and 9 mm at ground level and heights of 3.1, 1.8, 1.7 and 1.4 m) and growing under natural conditions. The vertical soil temperature profile (ST), soil surface heat flux (SoilG), volumetric soil moisture content (SWC) and meteorological variables such as solar radiation (R-n), air temperature (T-a), vapour pressure deficit (VPD), wind speed (W-s) relative humidity (RH) and precipitation (P) were simultaneously measured at a meteorological station on site. Results indicated that J(s) varied regularly during the diurnal and seasonal term. The nocturnal J(s) was substantial, with a seasonal variation similar to the patterns of daytime J(s). The magnitude of J(s) changed considerably between sunny and rainy days. Redundancy (RDA) and Kendall’s tau analysis suggested that daily J(s) in large plants was more sensitive to environmental factors, and the variation in daily J(s) during the growing season could be described by a multiple linear regression against environmental variables including T-a, VPD, Ws, RH, ST, and SoilG. While the nocturnal J(s) in smaller plants was more sensitive to meteorological factors. T-a, VPD, and W-s were significantly correlated with nighttime J(s). The hourly nighttime sap flow rate of H. scoparium corresponded closely to T-a and VPD following a non-linear pattern. The results of this study can be used to estimate the transpiration of H. scoparium.


类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000358154400063
WOS关键词HEAT-BALANCE METHOD ; NIGHTTIME WATER-USE ; STOMATAL CONDUCTANCE ; NOCTURNAL TRANSPIRATION ; EDDY COVARIANCE ; TROPICAL FOREST ; DESERT REGION ; WOODY-PLANTS ; TREES ; FLUX
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
来源机构北京林业大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189806
作者单位1.Beijing Forestry Univ, Sch Soil & Water Conservat, Yanchi Res Stn, Beijing 100083, Peoples R China;
2.Beijing Forestry Univ, Key Lab Soil & Water Conservat & Desertificat Com, Minist Educ, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714
Deng, Jifeng,Ding, Guodong,Gao, Guanglei,et al. The Sap Flow Dynamics and Response of Hedysarum scoparium to Environmental Factors in Semiarid Northwestern China[J]. 北京林业大学,2015,10(7).
APA Deng, Jifeng.,Ding, Guodong.,Gao, Guanglei.,Wu, Bin.,Zhang, Yuqing.,...&Fan, Wenhui.(2015).The Sap Flow Dynamics and Response of Hedysarum scoparium to Environmental Factors in Semiarid Northwestern China.PLOS ONE,10(7).
MLA Deng, Jifeng,et al."The Sap Flow Dynamics and Response of Hedysarum scoparium to Environmental Factors in Semiarid Northwestern China".PLOS ONE 10.7(2015).
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