發(fā)布時(shí)間：2018-02-01 13:58

  本文關(guān)鍵詞： 土壤水 穩(wěn)定同位素 運(yùn)移規(guī)律 補(bǔ)給來(lái)源 準(zhǔn)噶爾盆地　出處：《干旱區(qū)研究》2017年06期 　論文類型：期刊論文

【摘要】：在荒漠區(qū),土壤水是一切陸生植物賴以生存的基礎(chǔ),識(shí)別荒漠區(qū)土壤水的補(bǔ)給來(lái)源,探索土壤水的運(yùn)移機(jī)理,對(duì)于荒漠區(qū)生態(tài)修復(fù)非常必要。通過(guò)對(duì)荒漠區(qū)非飽和帶剖面土壤水的含水率、易溶鹽離子及穩(wěn)定同位素(δD、δ~(18)O)的測(cè)定和分析,研究荒漠區(qū)土壤水的補(bǔ)給來(lái)源與運(yùn)移機(jī)理。結(jié)果表明:荒漠區(qū)土壤含水率、易溶鹽與土壤水氫氧同位素在垂向上呈現(xiàn)旋回變化,剖面中土壤Cl-含量與含水量成正相關(guān);0~1.6 m為蒸發(fā)影響帶,1.6~8.0 m為土壤水向下運(yùn)移帶,8.0 m以下為潛水影響帶。從土壤水中氫氧同位素及Cl-含量信息來(lái)看,荒漠區(qū)土壤水來(lái)源于大氣降水的補(bǔ)給。旋回中Cl-含量極低值與δD與δ~(18)O極貧值相對(duì)應(yīng),δD值貧化峰值為-124.10‰~-97.39‰,荒漠區(qū)土壤水來(lái)源于冬季大氣降水或降雪的入滲補(bǔ)給。
[Abstract]:In desert region, soil water is the basis for the survival of all terrestrial plants. The recharge sources of soil water in desert area are identified and the mechanism of soil water migration is explored. It is necessary for ecological restoration of desert region. The moisture content, soluble salt ion and stable isotope (未 D, 未 ~ (18) O) of soil water in unsaturated zone of desert region are measured and analyzed. The recharge sources and transport mechanism of soil water in desert region were studied. The results showed that soil moisture content, soluble salt and hydrogen and oxygen isotopes of soil water in desert region showed a cyclic change in vertical direction. There was a positive correlation between soil Cl- content and water content in the profile. 0 ~ (1.6 m) is the evaporation influence zone (1.6 ~ 8.0 m) and below (8.0 m) is the phreatic zone. The information of hydrogen and oxygen isotopes and Cl-content in soil water is considered. The soil water in desert area is derived from the recharge of atmospheric precipitation. The very low value of Cl- content in the cycle corresponds to the extremely poor value of 未 D and 未 ~ (18) O. The peak value of 未 D dilution is -124.10 鈥，

本文編號(hào)：1482022