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頁籤選單縮合
題名 | Partitioning Evapotranspiration Flux Components in a Subalpine Shrubland Based on Stable Isotopic Measurements=使同穩定同位素方法劃分亞高山灌叢的蒸散組分 |
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作者 | 徐振; 楊海波; 劉福德; 安樹青; 崔軍; 王中生; 劉世榮; | 書刊名 | Botanical Studies |
卷期 | 49:4 2008.10[民97.10] |
頁次 | 頁351-361 |
分類號 | 436.12 |
關鍵詞 | 蒸散; 劃分通量; 川滇高山櫟; 半乾旱灌叢; 穩定同位素; Evapotranspiration; Flux partitioning; Quercus aquifolioides; Semiarid shrubland; Stable isotopes; |
語文 | 英文(English) |
中文摘要 | 在中國臥龍自然保護區季風期早期的三天裏,採進了川滇高山櫟亞高山灌叢中的土壤、植被和大氣水蒸氣(地面之上0.1~3 m)樣品進行穩定同位素分析。2006年6月研究區域內川滇高山櫟平均葉面積指數為2.05 m2 m-2,川滇高山櫟群落蓋度大於90%。本研究通過分析同位素湍流混合關係、植物蒸騰水和土壤表層蒸發水分的穩定同位素值,估算了蒸騰和蒸發對蒸散總量的貢獻比例。在本研究中運用δD得到了較精確的結果;而蒸騰水與土壤表層水之間較小的同位素差異可能導致在運用δ18O分析時得到的結果不精確。在2006年6月21日、24日和25日,δD方面的結果顯示植物蒸騰對蒸散的貢獻分別為7.45±9.9%、65.6±8.3%和96.9±2.0%,這表明川滇高山櫟灌叢中的蒸散主要來自於植物蒸騰。值得注意的是,草本層的蒸騰和灌木層的蒸騰對蒸散的貢獻同等重要。從短期和生態系統尺度上看,我們的方法在半乾旱亞高山灌叢中能有效劃分蒸散組分。本研究有助於加深對半乾旱生態系統中水分交換的認識,也驗證了一個在普通尺度上有較高空間代表性的測量蒸散組分通量的方法。 |
英文摘要 | Soil, vegetation and atmospheric water vapor (0.1~3 m above ground) were sampled in a subalpine shrubland covered with quercus aquifolioides during three days in the early monsoon period in Wolong Nature Reserve, China. In June 2006, the average LAI of Q. aquifolioides was 2.05 m2 m-2 and the average community coverage was more than 90%. Isotope turbulent mixing relationships, isotopic values of transpired water from plants and that of evaporating water vapor from soil surface were used to estimate fractions of transpiration and evaporation contributing to the total evaportranspiration (ET). The method worked well forδD, but it was imprecise forδ18O because the minute isotopic differences between transpired water and soil water. The results fromδD showed that fractional contributions of plant transpiration to ET were 74.5±9.9%, 65.6±8.3% and 96.9±2.0% on 21st, 24th and 25th June, 2006, respectively, implying that ET is mostly generated by plant transpiration. Notably, the transpiration from herbage layer for ET was likewise important as that from shrub layer. Our approach is useful for partitioning ET in semiarid subalpine shrubland at an ecosystem scale on short time steps. This approach improves the understanding of water exchange in semiarid ecosystems, and offers and opportunity to measure and validate component fluxes with accurate spatial representation at a common scale. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。