【摘要】：對(duì)近些年提出的兩種生態(tài)系統(tǒng)水分利用效率指標(biāo)——內(nèi)在水分利用效率(IWUE)和固有水分利用效率(u WUE)與經(jīng)典的水分利用效率(WUE)指標(biāo)在黃土高原典型半干旱草地生態(tài)系統(tǒng)的應(yīng)用情況進(jìn)行了比較,主要分析了不同指標(biāo)在小時(shí)、日和年尺度上的一致性和穩(wěn)定性,并提出優(yōu)化水分利用效率(o WUE)指標(biāo),比較了不同定義的水分利用效率指標(biāo)在模擬總初級(jí)生產(chǎn)力(GPP)逐日動(dòng)態(tài)過(guò)程上的表現(xiàn)。結(jié)果顯示:IWUE和u WUE適合在日和小時(shí)尺度分析植被的碳水耦合特征,WUE適合分析年尺度的碳水耦合特征;o WUE指標(biāo)在描述碳水耦合特征方面與u WUE相比并沒(méi)有本質(zhì)性改善,但在用于模擬GPP動(dòng)態(tài)過(guò)程時(shí)模擬效果改善明顯;采用o WUE和u WUE指標(biāo)能改善植被生長(zhǎng)盛期的GPP動(dòng)態(tài)過(guò)程模擬,但在生長(zhǎng)季早期和晚期的模擬效果比WUE差。IWUE指標(biāo)不適合模擬GPP動(dòng)態(tài)過(guò)程。
[Abstract]:Two kinds of ecosystem water use efficiency indexes, intrinsic water use efficiency (IWUE), inherent water use efficiency (u WUE) and classical water use efficiency (WUE), are proposed in recent years. The application of arid grassland ecosystem was compared. This paper mainly analyzes the consistency and stability of different indexes on the hourly, daily and annual scales, and puts forward to optimize the (o WUE) index of water use efficiency. The performance of different defined water use efficiency indexes in simulating the daily dynamic process of total primary productivity (GPP) was compared. The results show that IWUE and u WUE are suitable for analyzing the carbon-water coupling characteristics of vegetation at daily and hourly scales, and WUE is suitable for analyzing the carbon-water coupling characteristics of annual scales. O WUE index has no improvement compared with u WUE in describing the coupling characteristics of carbon and water, but the simulation effect is obviously improved when it is used to simulate the dynamic process of GPP. Using o WUE and u WUE indexes can improve the simulation of GPP dynamic process in the peak growth period of vegetation, but the simulation effect in the early and late growth season is worse than that in WUE. Iwue index is not suitable for simulating GPP dynamic process.
【作者單位】： 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)資源與環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(41390463)
【分類號(hào)】：S812

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