Response of Soil Moisture to Precipitation Pulse by Stable Isotope in Desert Area of the Hexi Corridor

doi:10.7522/j.issn.1000-694X.2016.00055

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (6): 1637-1645.DOI: 10.7522/j.issn.1000-694X.2016.00055

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Response of Soil Moisture to Precipitation Pulse by Stable Isotope in Desert Area of the Hexi Corridor

Zhou Hai^1,2, Zhao Wenzhi¹

1. Linze Inland River Basin Research Station of Chinese Ecosystem Research Network;Laboratory of Heihe River Eco-Hydrology and Basin Science, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, BeiJing 100049, China

Received:2016-03-04 Revised:2016-04-25 Online:2016-11-20 Published:2016-11-20

Abstract

Abstract: Using stable isotope investigated the soil moisture response of precipitation pulse in a typical desert area in the middle Hexi Corridor, China. The 18-oxygen of precipitation and rainfall distribution showed significantly seasonal effect. There were more rain frequency and heavier 18-oxygen of precipitation in summer than in winter. Precipitation input into soil by the way of pulse, and the soil water content and 18-oxygen showed different changes among soil layers after different precipitation. The 8-oxygen of soil water and resident time varied following the soil depth. We found that the precipitation moved through soil layers by piston displacement in this desert area. The soil moisture regulated and controlled by rainfall events, but the deeper water was little influenced by light rainfall. Although the frequency of heavy rainfall was low in the desert area, the deeper soil water could acquire effective recharge and have important significance in maintaining the development of the desert ecosystem.

Key words: desert area, precipitation pulse, soil moisture, stable isotope

CLC Number:

S152.7

Zhou Hai, Zhao Wenzhi. Response of Soil Moisture to Precipitation Pulse by Stable Isotope in Desert Area of the Hexi Corridor[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(6): 1637-1645.

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Response of Soil Moisture to Precipitation Pulse by Stable Isotope in Desert Area of the Hexi Corridor

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