Responses of Transpiration of Populus euphraticato Small Rainfall Events in Desert Riparian Forest

doi:10.7522/j.issn.1000-694X.2016.00097

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (5): 942-949.DOI: 10.7522/j.issn.1000-694X.2016.00097

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Responses of Transpiration of Populus euphraticato Small Rainfall Events in Desert Riparian Forest

Zhao Chunyan^1,2, Si Jianhua¹, Feng Qi¹, Yu Tengfei¹, Li Peidu^1,2

1. Key Laboratory of Eco-hydrology of Inland River Basin, Northwest Institute of Eoc-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Science, Beijing 100049, China

Received:2016-05-09 Revised:2016-06-29 Online:2017-09-20 Published:2017-09-20

Abstract

Abstract: Based on daily precipitation date of meteorological station in Ejina during 1960-2010 and transpiration of Populus euphratica were monitoring simultaneously with precipitation in 2012, 2013, respectively. Responses of transpiration to small rainfall events in desert riparian forest were studied. The results show that the frequency of small rainfall events reached 90.63%. The influence of small rainfall events on transpiration were changed with the mounts of rainfall. The transpiration was declined before <1 mm rainfall, but after rainfall the transpiration declined slowly, then increased after 2h. The transpiration decreased significantly before 1-4 mm rainfall, after rainfall transpiration remain unchanged at first 1-2 h, then increase quickly after 3-4 h. The effects of small rainfall events on transpiration exist time lag effect. The 0.2 mm rainfall has a little effect on transpiration, the variation trend was same as the day before rainfall. The influence of 0.4-0.8 mm rainfall was not noticeable after two days. The 1-4 mm small rainfall events have a great influence on transpiration and led to the decrease of transpiration in the first day after rainfall and led to the increase of transpiration in the second day after rainfall. transpiration of populus euphratica showed exponential correlation to small rainfall events and the influence of rainfall on transpiration was most significantly after 4 h and was not noticeable after 1 h.

Key words: small rainfall events, transpiration, Populus euphratica, desert riparian forest

CLC Number:

Q948.11

Zhao Chunyan, Si Jianhua, Feng Qi, Yu Tengfei, Li Peidu. Responses of Transpiration of Populus euphraticato Small Rainfall Events in Desert Riparian Forest[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(5): 942-949.

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Responses of Transpiration of Populus euphraticato Small Rainfall Events in Desert Riparian Forest

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