Hydrological cycle research by D&^(18)O tracing in small watershed in the loess hilly region  

作　　者：Xu Xuexuan Zhao Jiaona Zhang Xiaoni 

机构地区：[1]Institute of soil and water conservation,Northwest A&F University,Xi'an,Shaanxi,China [2]Xiangyu Water Conservancy Survey and Design Limited Company,Xingtai,Hebei,China [3]Institute of soil and water conservation,Northwest A&F University,Shaanxi,China

出　　处：《International Soil and Water Conservation Research》2013年第3期75-82,共8页国际水土保持研究（英文）

基　　金：supported jointly by the Key Project of Chinese Academy of Sciences(KZZD-EW-04-03);the National Science Foundation of China(41171421);the Basic Scientific Fund of Northwest Agriculture and Forestry University(2109021121).

摘　　要：The objective of this study was to determine the mechanisms of the hydrologic cycle in the loess area in China.Sixty eight water samples from precipitation,soil water of the 0-4 m layer,surface water in the valley,ground water(spring and well)were collected and the Deuterium(D)and Oxygen-18(^(18)O)of these water samples were analyzed to interpret the relationship among those waters in the watershed in the loess hilly region during 2005-2009.The results show that:the D&^(18)O of precipitation in Yangou was consistent with that of Xi,an,apparently the north migration of water vapor in Xi^an;according to the correlations among the differential waters in D&^(18)O,confirmed that precipitation recharge could account for most of the sources of valley flow,with part of the recharge water going to soil water recharge.The D&^(18)O of groundwater were very close to that of precipitation,likely the soil preferential flow was dominant in groundwater recharge although the infiltration had a certain lag.Under the influence of rainfall and evaporation,the response of the soil moisture profile,and its D&^(18)O profile were different.The soil moisture had the strong influenced layer in the 60-160 cm range,a weak impacted layer in 60 l60 cm,and a stable layer below l60 cm.It was shown that the soil evaporation depth could be up to l60 cm because the D&^(18)O changed in that depth.The study could increase our understanding of the magnitude and pattern of the hydrologic cycle,which should improve water resources management in the watershed scale.

关 键 词：Hilly area in the Loess Plateau PRECIPITATION GROUNDWATER Soil water D&^(18)O 

分 类 号：P64[天文地球—地质矿产勘探]