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

Title:

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

Creator:

Jian, Shengqi, Wu, Zening, Hu, Caihong, and Zhang, Xueli

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:e3b56da8-9b31-4d64-8c2c-d5add3d565c9
uuid:e3b56da8-9b31-4d64-8c2c-d5add3d565c9
doi:10.1515/johh-2016-0023

Subject:

rainfall pulses, sap flow, meteorological factors, loess plateau, Caragana korshinskii, and Hippophae rhamnoides

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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.

Language:

Slovak

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

121-132

Source:

Journal of hydrology and hydromechanics | 2016 Volume:64 | Number:2

Harvested from:

CDK

Metadata only:

false