地热田油同位素研究证明：蒸气井热流体的95左右是大气降水成因的。
Isotopic studies from geothermal fields indicate that about 95% of the thermal fluid from steam Wells is meteoric in origin.
结果表明，秸秆还田提高了作物产量，增加了土壤有机碳积累和土壤氮磷含量，且能活化土壤磷素。
The results showed that straw application increased crop yield, soil organic carbon accumulation, soil total nitrogen and phosphorus content as well as phosphorus activation.
但从提高作物产量和缓解土壤钾素下降来看，小麦秸秆还田是一个有效的补钾措施。
In order to increase crop yield and retard decrease of soil K, wheat straw to soil was an effective measure to complement potassium.
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