Deep soil water infiltration and its dynamic variation in the shifting sandy land of typical deserts in China  

作　　者：YANG WenBin TANG JinNian LIANG HaiRong DANG HongZhong LI Wei 

机构地区：[1]Institute of Desertification Studies, Chinese Academy of Forestry [2]State Key Laboratory Breeding Base of Gansu Desertification and Aeolian Sand Disaster Combating,Gansu Desert Control Research Institute [3]Inner Mongolia Academy of Forestry Science

出　　处：《Science China Earth Sciences》2014年第8期1816-1824,共9页中国科学（地球科学英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2013CB429901);the National Natural Science Foundation of China (Grant Nos. 31170667 and 40971283)

摘　　要：Soil moisture is the key resource constraint in arid ecosystems, and has been a focus of research on restoration. However, quantitative studies on the contribution of rainfall to deep soil rainfall infiltration are lacking. In this study, we used the YWB-01 Deep Soil Infiltration Water Recorder which had been invented by ourselves to measure the quantity of rain infiltration into deep soil, 150 cm below ground, in four locations in China: Mu Us Sandy Land and Ulan Buh, Tengger, and Badan Jilin deserts over a 2-year period. We found:(1) Deep soil rainfall infiltration decreased progressively from east to west and from semiarid to arid areas, with two locations completely lacking rainfall infiltration. Heavy rain was important to deep soil infiltration in shifting sandy land of arid and semiarid areas.(2) Seasonal variation of infiltration was correlated with rainfall, with a time lag that was less apparent in areas with more rainfall.(3) For single intense rainfall events, infiltration maximums occurred 40–55 h after the rainfall, during which the infiltration rates increased rapidly before reaching a peak, and then decreased slowly. Continuous infiltration could last about 150 h. Rainfall infiltration was determined by the combined action of intensity, quantity and duration. Rainfall with low intensity, long duration, and large quantity was most favorable for deep soil infiltration. Our results can be used in water resource assessments and protection during eco-restoration in the arid and semiarid areas in China.Soil moisture is the key resource constraint in arid ecosystems, and has been a focus of research on restoration. However, quantitative studies on the contribution of rainfall to deep soil rainfall infiltration are lacking. In this study, we used the YWB-01 Deep Soil Infiltration Water Recorder which had been invented by ourselves to measure the quantity of rain infiltration into deep soil, 150 cm below ground, in four locations in China： Mu Us Sandy Land and Ulan Buh, Tengger, and Badan Jilin deserts over a 2-year period. We found：（1） Deep soil rainfall infiltration decreased progressively from east to west and from semiarid to arid areas, with two locations completely lacking rainfall infiltration. Heavy rain was important to deep soil infiltration in shifting sandy land of arid and semiarid areas.（2） Seasonal variation of infiltration was correlated with rainfall, with a time lag that was less apparent in areas with more rainfall.（3） For single intense rainfall events, infiltration maximums occurred 40–55 h after the rainfall, during which the infiltration rates increased rapidly before reaching a peak, and then decreased slowly. Continuous infiltration could last about 150 h. Rainfall infiltration was determined by the combined action of intensity, quantity and duration. Rainfall with low intensity, long duration, and large quantity was most favorable for deep soil infiltration. Our results can be used in water resource assessments and protection during eco-restoration in the arid and semiarid areas in China.

关 键 词：deep soil water infiltration dynamic variation RAINFALL shifting sandy land arid and semiarid areas 

分 类 号：S152.7[农业科学—土壤学] P931.3[农业科学—农业基础科学]