ISWC OpenIR  > 水保所知识产出(1956---)
陈 曦1; 李 志1,2; 程立平3; 刘文兆2; 王 锐4
Source Publication生 态 学 报

降水是水资源的主要输入,分析其氢氧稳定同位素特征可为水循环研究提供重要的背景信息。基于 4a 的降水样品采集,
测定和分析了黄土塬区降水氢氧同位素( 2 H,
17 O 和 18 O)的组成特征,进而分析了其水汽来源。降水同位素有明显的年内变化,
2—6 月富集而 7—11 月贫化;δD 和 δ 18 O 存在雨量效应和温度效应,分别出现在 6—9 月和 10—5 月;但这些组成特征受气候变
异影响存在年际差异。综合分析降水方程线、D 盈余和 17 O 盈余,发现黄土塬区 6—9 月降水来自海洋性气团,10—5 月降水是
对湿度达 90%左右时才产生。全年至少 30%的降水事件经历了严重的二次蒸发。

Other Abstract

 As important constituents of a water molecule,the stable hydrogen and oxygen isotopes are ideal conservative
tracers for water source,and thus,have been widely used in water cycle research. Precipitation is the main input of water
resources; therefore,analysis of its hydrogen and oxygen isotopic compositions can provide basic information for water
cycle. Until now,some research has been carried out for the arid and semi-arid regions on the Loess Plateau; however,few
studies have focused on the semi-humid region. The Changwu Loess Tableland,which is located in the southern part of the
central Loess Plateau and is characterized by a warm temperate,semi-humid,continental monsoon climate (annual mean
precipitation is 578 mm),has been studied. In this study,the hydrogen and oxygen isotopic compositions ( 2 H,
18 O and
17 O) of precipitation and some climatic factors (temperature,precipitation amount,humidity) of four years (2005,2010,
2012—2013) have been determined fort the investigation of the vapor source of precipitation. Both seasonal and inter-
annual variations were detected from the isotopic compositions of the precipitation. The isotopic compositions were more  depleted from July to November,and the δ
18 O and δD varied from -12. 42‰ to -9. 96‰ and from -88. 62‰ to -65.
18‰,respectively; however,they were more enriched from February to June,and the ranges of δ
18 O and δD were -7. 89‰
to -5. 08‰ and -50. 08‰ to -27. 90‰,respectively. The most abundant depleted isotopic compositions were observed in
July,which was considered to be the effect of marine air mass and precipitation amount. δD and δ
18 O had a significant
relationship with the precipitation amount from June to September,and while they correlated well with air temperatures from
October to May. The inter-annual variations in isotopic compositions of precipitation were mainly due to the climate
variability; for example,the temperatures in the summer of 2005 were the highest since 1951,and it would,thus,yield
different seasonal patterns of isotopic compositions as compared to the other three years. Meanwhile,the isotopic
compositions of precipitation in the Changwu Loess Tableland were different from those of the arid regions and similar to
some of the humid monsoon regions. According to the analysis of isotopic compositions,meteoric water line,D-excess,and
17 O excess,the marine air mass was the dominant vapor source for precipitation from June to September,especially from
July to September,while precipitation from October to May were significantly influenced by regional evaporation and
continental air mass. Furthermore,the weighted average D-excess of most months was higher than the global average
(10‰),which implied that the isotopic compositions were influenced by local evaporation throughout the year. In rainy
season,a few precipitation events were directly associated with marine air mass,while the other events occurred only when
the relative humidity exceeded 90% due to the reallocation of marine air mass. At least 30% of the precipitation events
have experienced serious secondary evaporation. Analysis of the vapor source by
17 O is still at the preliminary stage and few
researches have been done in China; therefore,studying
17 O concentrations can provide additional useful information to
interpret the water cycle in future research.

Keyword大气降水 氢氧同位素 水汽来源 黄土塬区 17 o 盈余
Indexed By中文核心期刊要目总览
Document Type期刊论文
Affiliation1.西北农林科技大学资源环境学院,杨凌 712100
2.黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌 712100
3.平顶山学院资源与环境科学学院,平顶山 467000
4.河南理工大学测绘与国土信息工程学院,焦作 454000
Recommended Citation
GB/T 7714
陈 曦,李 志,程立平,等. 黄土塬区大气降水的氢氧稳定同位素特征及水汽来源[J]. 生 态 学 报,2016,36(1):98-106.
APA 陈 曦,李 志,程立平,刘文兆,&王 锐.(2016).黄土塬区大气降水的氢氧稳定同位素特征及水汽来源.生 态 学 报,36(1),98-106.
MLA 陈 曦,et al."黄土塬区大气降水的氢氧稳定同位素特征及水汽来源".生 态 学 报 36.1(2016):98-106.
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