河西走廊典型荒漠区土壤水分对降水脉动响应的稳定同位素分析

周海; 赵文智

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

中国沙漠 >

2016 , Vol. 36 >Issue 6: 1637 - 1645

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

生物与土壤

河西走廊典型荒漠区土壤水分对降水脉动响应的稳定同位素分析

周海 ,
赵文智

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1. 中国科学院西北生态环境资源研究院中国生态系统研究网络临泽内陆河流域研究站/中国科学院内陆河流域生态水文重点实验室, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049

周海(1985-),男,甘肃古浪人,博士研究生,研究方向为生态水文学。E-mail:zhouhai1201@126.com

收稿日期: 2016-03-04

修回日期: 2016-04-25

网络出版日期: 2016-11-20

基金资助

国家重点基础研究发展计划项目（2013CB429903）

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

Zhou Hai ,
Zhao Wenzhi

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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 date: 2016-03-04

Revised date: 2016-04-25

Online published: 2016-11-20

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摘要

基于稳定同位素技术研究了河西走廊中部典型荒漠区土壤水分对降水脉动的响应。结果表明：降水分布及其δ¹⁸O值都存在显著的季节变化特征，降水事件多发生在夏季，且有较高的δ¹⁸O值，而冬季降水稀少，且δ¹⁸O值偏低。降水以脉动方式输入土壤中，不同量级的降水事件会导致土壤含水量和δ¹⁸O值不同程度的响应。降水入渗后不同深度的土壤含水量和δ¹⁸O值的响应程度和响应时间不同，土壤深度越大，响应程度越小且响应时间越滞后。对比降水δ¹⁸O值和降水后不同深度的土壤水δ¹⁸O值的变化发现，表层土壤能够迅速的对降水做出响应，下层土壤的响应具有滞后性。即这种自上而下的活塞式下渗是该区主要的降水入渗方式。荒漠区土壤水分受降水的调节和控制，但是深层土壤水受小降水事件的影响较小，大降水事件虽然发生频率较小，但是能够对深层土壤水形成有效的补给，对整个荒漠生态系统的可持续发展都具有十分重要的意义。

关键词： 荒漠区; 降水脉动; 土壤水分; 稳定同位素

本文引用格式

周海 , 赵文智 . 河西走廊典型荒漠区土壤水分对降水脉动响应的稳定同位素分析[J]. 中国沙漠, 2016 , 36(6) : 1637 -1645 . DOI: 10.7522/j.issn.1000-694X.2016.00055

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

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