This paper mainly revolves around three aspects to introduce the significance of sulfur isotopic study , they are sulfur isotopes in coals , sulfur isotopic compositions of surface water and sulfur isotopes in wheat 本文从大气降水中的硫同位素组成、小麦的硫同位素组成和煤的硫同位素组成三方面探讨了酸雨硫同位素研究的重要意义。
In order to recover the tritium concentration in precipitation from 1953 to 2001 for xi ' an area , two methods such as interpolation method and two conference curve method have been employed , and the tritium concentration in precipitation has been recovered 利用插值法与双参考曲线法对关中盆地1953年以来各年大气降水氚浓度进行了恢复。
Through selecting two representative profiles in guanzhong basin and by means of environmental isotope techniques , the paper systemically studies the transform relationships of precipitation , stream water and groundwater 通过在关中盆地选取两条具有代表性的剖面，利用环境同位素方法系统的研究了大气降水、地表水和地下水三者之间转化关系。
In order to comprehensively and systematically study the mechanism of ground collapse , in this paper , from underground mining , dewatering , precipitation , moving groundwater and blasting vibration , the causes of ground collapse have been analyzed 为了全面系统地研究地表塌陷的形成机理，从地下开采、降水疏干、大气降水、地下动水和爆破震动等几个方面分析了引起地表塌陷的原因。
Conclusion from the analysis : the exploitation and reentry determine the groundwater level behavior , quality of groundwater behavior and temperature of groundwater behavior , but other factors such as rainfall work in some concert with them 通过分析可知：人工开采和回灌对地下水水位动态、水质动态和水温动态起着决定性的作用，但大气降水等其他因素对地下水动态仍有一定的影响。
It belongs to nacl - h2o - co2 system . the ore - forming element assemblage is as - sb - cu - ni - u with high contents of as and sb . the stable isotope data show the metallogenic fluid comes from the mixture of magmatic water with meteoric water and stratum water 流体中成矿元素组合为as - sb - cu - ni - u ，总体上具较高的sb ， as含量；稳定同位素特征表明成矿溶液主要来自岩浆水与大气降水、沉积盆地地层水的混合。
The ore - forming material is mostly from volcanic rock , and sub volcanic rock provides the main thermal and some mineral materials . the ore - forming fluid is from meteoric water . as a result , it should be a kind of adularia - sericite type of epithermal gold deposit 成矿物质主要来自矿区火山岩围岩，次火山岩提供了主要热源和部分矿源，成矿流体来自大气降水，矿床成因类型为低硫化物冰长石?绢云母型浅成低温热液型金矿。
The 0 . 28xl0 ~ _ ( 9 ) t carbon derived from atmospheric co _ ( 2 ) is transferred from atmosphere and biosphere to the ocean by surface rock weathering processes . in order to monitor the quality of the river , it is also important to understand the natural flux of dissolved ions 珠江流域3条主要支流的化学风化过程存在明显差异，西江和北江流基本以碳酸盐类溶解为主，而东江河水扣除大气降水的来源外，溶解质基本出自硅酸盐类的风化。
Infiltration of atmosphetic water and river leakage are the major supply source of krast water in jinan spring field , while artificial water - taking and spring discharge are its major discharge forms . the karst water flows from south to north in the whole and the average recharge capacity is 55 x 104m3 / d 岩溶水补给来源主要为大气降水渗入和河流渗漏，排泄方式主要为人工开采和泉水排泄，总体向北径流，泉域多年平均补给量为55万m ~ 3 d 。
3 . it is clear that co2 concentration of epikarst ecosystem has been influenced for rain . the varied range of soil co2 concentration is mainly influenced by rain frequency , secondly the amount of rainfall for the epikarst ecosystem of woodland and uncovered land 3大气降水对表层带岩溶生态系统各层coz有明显的“沉淀”作用，影响林地与裸地土壤各层coz浓度降低的幅度主要取决于降雨的频率，其次才是降雨量，而影响植被? ?空气系统各层co 。
