不同生态系统水分利用效率指标在黄土高原半干旱草地应用的适宜性评价
发布时间：2019-05-16 08:46
【摘要】：对近些年提出的两种生态系统水分利用效率指标——内在水分利用效率(IWUE)和固有水分利用效率(u WUE)与经典的水分利用效率(WUE)指标在黄土高原典型半干旱草地生态系统的应用情况进行了比较,主要分析了不同指标在小时、日和年尺度上的一致性和稳定性,并提出优化水分利用效率(o WUE)指标,比较了不同定义的水分利用效率指标在模拟总初级生产力(GPP)逐日动态过程上的表现。结果显示:IWUE和u WUE适合在日和小时尺度分析植被的碳水耦合特征,WUE适合分析年尺度的碳水耦合特征;o WUE指标在描述碳水耦合特征方面与u WUE相比并没有本质性改善,但在用于模拟GPP动态过程时模拟效果改善明显;采用o WUE和u WUE指标能改善植被生长盛期的GPP动态过程模拟,但在生长季早期和晚期的模拟效果比WUE差。IWUE指标不适合模拟GPP动态过程。
[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.
【作者单位】： 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院大学资源与环境学院;
【基金】：国家自然科学基金(41390463)
【分类号】：S812
本文编号：2478164
[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.
【作者单位】： 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院大学资源与环境学院;
【基金】：国家自然科学基金(41390463)
【分类号】：S812
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