中文摘要：

沿丹江干流自上游到下游每5km采集水样,并在丹江上中下游小流域沿河采集水样的同时分别在沿岸选择林地、草地和农地,采集土壤样品。通过相关性分析和ANOVA分析等方法研究丹江流域氢氧同位素的变化特征和影响因素。结果表明：丹江流域大气降水的氢氧同位素变化呈现出高度效应,高程、温度和距离对丹江流域水体的氢氧同位素特征影响较大;δD值与高程呈极显著水平负相关（P〈0.01,n=25）,而与水温呈极显著水平正相关（P〈0.01,n=25）,氢氧同位素特征表明蒸发分馏作用在较宽及流速小的河面更强烈;丹江干流水体中δD和δ18 O的分布范围分别为（-60.98‰）-53.34‰和（-9.12‰）-7.89‰,其平均值分别为-56.20‰和-8.29‰。随着采样点位置到丹江源头距离的增加,δD值逐渐增大,其线性拟合方程为y=0.0268x-59.435,拟合度R2为0.62;林地和草地0-10cm土壤水分的氢氧同位素变化范围较农地大,农地0-10cm土壤水分的氢氧同位素值相对集中,ANOVA分析表明,丹江上中下游小流域0-10cm土壤水分的氢氧同位素特征存在极显著差异（P〈0.01,n=42）。

英文摘要：

Water samples were collected every five kilometer along the Danjiang from upstream to downstream and were also collected in small watershed of the Danjiang.Meanwhile,the soil samples were collected from woodland,meadow,and farmland along the river.By using correlation analysis and ANOVA analysis methods,the characteristics and influence factors of hydrogen and oxygen isotopes of the Danjiang watershed were analyzed.The results indicated that the variations of hydrogen and oxygen isotopes of precipitation in Danjiang watershed showed altitude effect.Elevation,temperature and distance had remarkable effect on the features of hydrogen and oxygen isotopes in water bodies.There was a strong negative correlation betweenδD and elevation（P〈0.01,n=25）.δD was positively correlated with water temperature（P〈0.01,n=25）.The features of hydrogen and oxygen isotopes indicated that evaporative fractionation was stronger in wide and small flow river.The distribution range ofδD andδ18 O in Dan river were（-60.98‰）-53.34‰and（-9.12‰）-7.89‰,respectively.The average values were-56.20‰and-8.29‰,respectively.As the distance of the sampling point to the source of Danjiang increased,theδD value increased gradually.The linear regression equation was y=0.0268x-59.435,and the fitting degree R2 was 0.62.The distribution range of hydrogen and oxygen isotopes at the depth of 0-10 cm in the soil water of woodland and grassland were larger than that of cropland.The distribution range of hydrogen and oxygen isotopes at the depth of 0-10 cm in the soil water of cropland was relatively concentrated.The ANOVA showed that the feature of hydrogen and oxygen isotopes at the depth of 0-10 cm in the soil water of small watershed among top of Danjiang watershed,middle of Danjiang watershed and bottom of Danjiang watershed existed significantdifferences（P〈0.01,n=42）.