Isotope variations of throughfall, stemflow and soil water in a tropical rain forest and a rubber plantation in Xishuangbanna, SW China
Isotope variations of throughfall, stemflow and soil water in a tropical rain forest and a rubber plantation in Xishuangbanna, SW China
复制标题
西双版纳热带雨林和橡胶园径流、茎流和土壤水同位素变化
DOI：
10.2166/nh.2008.110
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发表时间：
2008-12-01
影响因子：
2.7
通讯作者：
Li, Hong Mei
中科院分区：
文献类型：
--
作者：
Liu, Wen Jie;Liu, Wen Yao;Li, Hong Mei
为了评估植被结构对雨水通过林冠过程中雨水输入同位素组成的影响，收集了2002-2004年热带季节雨林（TSRF）林分和橡胶林（RP）林分的降雨、通流、茎流和土壤水分，进行了稳定同位素分析。结果表明，森林冠层结构对降雨分配、穿透水、茎流和土壤水同位素组成有强烈的影响。尽管两种林分的通流和茎流总体平均同位素组成差异较小，差异不显著（P >0.05），但仅考虑小雨事件（≤10 mm）时差异更大。在旱季，TSRF土壤水分同位素组成的富集和δ 18o / δ d回归线斜率的减小并不表明土壤水分通过蒸发而大量流失，而是雾滴、透水和茎流的富集。而RP林分土壤蒸发量显著。在雨季，两个林分的土壤水分都没有表现出明显的蒸发效应。
To assess the influence of vegetation structure on the isotopic composition of rainwater input during its passage through the canopy, rainfall, throughfall, stemflow and soil water were collected at a tropical seasonal rain forest (TSRF) stand and a rubber plantation (RP) stand for stable isotopic analysis during the 3 year period 2002–2004. The result clearly shows that the rainfall partitioning and the isotopic composition of throughfall, stemflow and soil water were strongly influenced by the forest canopy structure. Although the differences of overall mean isotopic composition of throughfall and stemflow between the two forests were small and not significantly different ( P >0.05), greater differences were found when only light rain events (≤10 mm) were taken into consideration. During the dry season, the enriched isotopic composition and the smaller slope of the regression line of δ 18 O versus δD for soil water in the TSRF is not an indication that it lost significant water by evaporation, but a mixture of enriched fog drip, throughfall and stemflow. However, the soil in the RP stand showed significant evaporation. During the rainy season, the soil water for both stands did not appear to display considerable evaporation effects.