Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau

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Title:Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau
Creators:
Jian, Shengqi; jiansq at zzu dot edu dot cn; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Wu, Zening; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Hu, Caihong; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Zhang, Xueli ; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 64, 2, pp. 121-132
Uncontrolled Keywords:rainfall pulses, sap flow, meteorological factors, Loess Platean, Caragana korshinskii, Hippophae rhamnoides

Abstract

Rainfall pulses can significantly drive the evolution of the structure and function of semiarid ecosystems, and understanding the mechanisms that underlie the response of semiarid plants to rainfall is the key to understanding the responses of semi–arid ecosystems to global climatic change. We measured sap flow in the branches and stems of shrubs (Caragana korshinskii Kom. and Hippophae rhamnoides Linn.) using sap flow gauges, and studied the response of sap flow density to rainfall pulses using the “threshold–delay” model in the Chinese Loess Plateau. The results showed that the sap flow began about 1 h earlier, and increased twofold after rainfall, compared to its pre-rainfall value. The sap flow increased significantly with increasing rainfall classes, then gradually decreased. The response of sap flow was different among rainfall, species, position (branch and stem) during the pulse period, and the interactive effects also differed significantly (P < 0.0001). The response pattern followed the threshold–delay model, with lower rainfall thresholds of 5.2, 5.5 mm and 0.7, 0.8 mm of stem and branch for C. korshinskii and H. rhamnoides, demonstrating the importance of small rainfall events for plant growth and survival in semi–arid regions.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau
Translated title:Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau
Creators:
Jian, Shengqi; jiansq at zzu dot edu dot cn; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Wu, Zening; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Hu, Caihong; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Zhang, Xueli ; College of Water Conservancy & Environmental, Zhengzhou University, Science road 100, Zhengzhou, China.
Uncontrolled Keywords:rainfall pulses, sap flow, meteorological factors, Loess Platean, Caragana korshinskii, Hippophae rhamnoides
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:64
Number:2
Page Range:pp. 121-132
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8645
Item Type:Article
Deposited On:28 Jun 2016 14:05
Last Modified:28 Jun 2016 12:05

Citation

Jian, Shengqi; Wu, Zening; Hu, Caihong; Zhang, Xueli (2016) Sap flow in response to rainfall pulses for two shrub species in the semiarid Chinese Loess Plateau. Journal of Hydrology and Hydromechanics, 64 (2). pp. 121-132. ISSN 0042-790X

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