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中文摘要：
通过对黄土丘陵区燕沟流域多年降水的各项特征指标进行分析，研究了该区降水的年际变化特征，并初步提出了该区大气降水线方程。结果表明：研究区降水的年际变化差异很大；丰水年数与枯水年数较为接近，但发生连枯的年数大于发生连丰的年数；降水的逐年变化呈现波动，但整体变化趋势为逐年减少。研究区降水的氢氧同位素值普遍偏大，降水线方程为8D=7．5537δ^18O＋4．6211，与全球和中国降水线有明显区别。氘盈余雨季前大于西安站和全球水平，而雨季中则小于西安站和全球水平。
英文摘要：
Based on some characteristic indexes of precipitation, the annual precipitation change characteristices at Yangou watershed in the Loess hilly region were studied, and the locally meteoric water line （LMWL） was obtained. The results showed that the annual change of precipitation varied greatly. The number of rainy year and dry year were nearly same. But the number of continuous drought year was higher than that of continuous rainy year. The change of precipitation decreased year by year. The LMWL of study area was δD = 7. 5537δ^18O ＋ 4. 6211. It was different significantly from the LMWL of China and the global meteoric water line （GMWL）. Before the rainy season, the dexcess of study area was higher than that of Xihn. But in the rainy season, the dexcess in study area decreased and was lower than Xihn.
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