真空蒸餾提取與原位采集對土壤水氫氧穩(wěn)定同位素值比值的影響
發(fā)布時間:2018-07-17 08:10
【摘要】:為了研究不同采樣方法對采集的土壤水氫氧穩(wěn)定同位素比值的影響,設計了室內降水入滲模擬試驗,收集土柱底部出流水、土壤溶液采樣器原位采集10cm、40cm、70cm、100cm處的土壤水,在相同層位采集土壤樣品并采用真空蒸餾法提取土壤水。通過樣品的氫氧穩(wěn)定同位素比值對比分析可知,降水入滲干燥的土壤過程中土顆粒優(yōu)先吸附輕同位素,第一個收集的水分具有最正的氫氧穩(wěn)定同位素比值;真空蒸餾法提取的土壤水是土壤吸濕水和入滲水分的混合,土壤溶液采樣器原位采集的土壤水代表土壤中流動的水分,此水分是土壤中可被有效利用的水分。
[Abstract]:In order to study the influence of different sampling methods on the stable isotopic ratio of hydrogen and oxygen in soil water, a simulated experiment of precipitation infiltration was designed. Soil samples were collected at the same layer and soil water was extracted by vacuum distillation. Through the comparison and analysis of the hydrogen and oxygen stable isotopic ratios of the samples, it can be seen that the soil particles preferentially adsorb light isotopes in the process of precipitation infiltration and drying, and the first water collected has the most positive hydrogen and oxygen stable isotopic ratios. The soil water extracted by vacuum distillation is a mixture of soil moisture absorption and infiltration water. Soil water collected in situ by a soil solution sampler represents the water flowing in the soil, which can be effectively used in the soil.
【作者單位】: 南京工程學院環(huán)境工程學院;河海大學水文水資源與水利工程科學國家重點試驗室;
【基金】:南京工程學院引進人才科研啟動基金(YKJ201327)
【分類號】:S152.7
本文編號:2129743
[Abstract]:In order to study the influence of different sampling methods on the stable isotopic ratio of hydrogen and oxygen in soil water, a simulated experiment of precipitation infiltration was designed. Soil samples were collected at the same layer and soil water was extracted by vacuum distillation. Through the comparison and analysis of the hydrogen and oxygen stable isotopic ratios of the samples, it can be seen that the soil particles preferentially adsorb light isotopes in the process of precipitation infiltration and drying, and the first water collected has the most positive hydrogen and oxygen stable isotopic ratios. The soil water extracted by vacuum distillation is a mixture of soil moisture absorption and infiltration water. Soil water collected in situ by a soil solution sampler represents the water flowing in the soil, which can be effectively used in the soil.
【作者單位】: 南京工程學院環(huán)境工程學院;河海大學水文水資源與水利工程科學國家重點試驗室;
【基金】:南京工程學院引進人才科研啟動基金(YKJ201327)
【分類號】:S152.7
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