【摘要】：系統(tǒng)水分利用效率(WUE)是高寒草甸生態(tài)系統(tǒng)碳水耦合及植被演替的重要指標(biāo),但其時(shí)間格局和主要環(huán)境因素仍不清楚�；谇嗖馗咴瓥|北隅高寒嵩草草甸的渦度相關(guān)儀器觀測(cè)的CO_2和H_2O通量數(shù)據(jù),分析了2015年植被生長(zhǎng)季(4月-10月)的系統(tǒng)水分利用效率(總初級(jí)生產(chǎn)力/植被蒸騰)的變化特征和主要環(huán)境影響因子。結(jié)果表明,總初級(jí)生產(chǎn)力(GPP)和植被蒸騰具有顯著的單峰季節(jié)趨勢(shì),與群落葉面積指數(shù)(LAI)顯著相關(guān)。生長(zhǎng)季日均WUE為3.24g C·kg H_2O~(-1),沒(méi)有顯著的季節(jié)動(dòng)態(tài),呈現(xiàn)出"保守型"的特征。增強(qiáng)回歸樹(shù)的結(jié)果表明光合光量子通量密度(PPFD)、飽和水汽壓差(VPD)和凈輻射(Rn)是其主要調(diào)控因素,與WUE顯著指數(shù)負(fù)相關(guān)(r~20.40,p0.001)。
[Abstract]:Water use efficiency (WUE) is an important indicator of carbon / water coupling and vegetation succession in alpine meadow ecosystem, but its time pattern and main environmental factors are still unclear. Based on the CO_2 and H _ 2O fluxes observed by the vorticity correlation instrument in the alpine Kobresia humilis meadow in the northeast part of the Qinghai-Xizang Plateau, The variation characteristics of water use efficiency (total primary productivity / vegetation transpiration) and the main environmental impact factors in the vegetation growth season (April-October) in 2015 were analyzed. The results showed that total primary productivity (GPP) and vegetation transpiration had a significant single peak seasonal trend, which was significantly correlated with the area index (LAI). The average daily WUE of growing season is 3.24g C kg H _ 2O-1, and there is no significant seasonal dynamic, which shows the characteristic of "conservative". The results of enhanced regression tree showed that (PPFD), saturated water vapor pressure difference (VPD) and net radiation (Rn) (Rn) were the main regulatory factors, which were negatively correlated with the significant index of WUE (r = 20.40p 0.001).
【作者單位】： 青海省工程咨詢(xún)中心;中國(guó)科學(xué)院西北高原生物研究所高原生物進(jìn)化與適應(yīng)重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院地理科學(xué)與資源研究所生態(tài)系統(tǒng)網(wǎng)絡(luò)觀測(cè)與模擬重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);
【基金】：青海省國(guó)際科技合作項(xiàng)目(2015-HZ-804) 國(guó)家自然科學(xué)基金項(xiàng)目(31270520;31300385;31270523) 中國(guó)科學(xué)院戰(zhàn)略性先導(dǎo)科技專(zhuān)項(xiàng)(XDB03030502)資助
【分類(lèi)號(hào)】：S812

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