CO_(2)浓度升高对陆地生态系统水分利用效率的影响:基于控制性实验的整合分析  

Impacts of CO_(2) Enrichment on Water Use Efficiency in Terrestrial Ecosystems: A Meta-analysis of Experimental Manipulations

作　　者：邹婧汝 李帅[1] ZOU Jingru;LI Shuai(College of Geography and Environmental Science,Henan University,Kaifeng,Henan 475004,China)

机构地区：[1]河南大学地理与环境学院,河南开封475004

出　　处：《Journal of Resources and Ecology》2023年第1期167-176,共10页资源与生态学报（英文版）

摘　　要：CO_(2)浓度的升高对植物的水分利用效率有重要的影响。本研究获取1989-2019年间242组相关的控制性实验数据,利用整合分析的方法研究CO_(2)浓度升高对陆地生态系统植被水分利用效率的影响。结果显示,CO_(2)浓度升高对水分利用效率有正面的影响,增加的比例为46%,但是存在较大的异质性。对叶面尺度、谷粒尺度、地上部分和植物整体的水分利用效率的影响分别增加76%、9%、30%和37%,其中对叶面尺度水分利用效率的影响最大(P<0.05),对植物整体水分利用效率的影响大于谷粒尺度的水分利用效率。此外,CO_(2)浓度对森林生态系统水分利用效率的影响高于农田生态系统下的影响(P<0.05)。气候控制箱方法下CO_(2)浓度升高对水分利用效率影响高于开顶式气候箱和温室条件下的影响(P<0.05),然而温室条件下对植物整体水分利用效率的影响高于气候控制箱和开顶式气候箱方法下的影响(P<0.05)。研究还发现,CO_(2)浓度升高对水分利用效率的影响与其升高的程度有正相关的关系(P<0.05),对谷粒尺度的水分利用效率的影响与CO_(2)浓度升高维持的时间也有正相关的关系。研究表明,CO_(2)浓度对水分利用效率的影响受研究尺度、植被类型以及实验条件等多因素的影响而有不同。Elevated CO_(2)(eCO_(2)) has important impacts on plants,especially on water use efficiency (WUE).A meta-analysis was performed to determine the responses of WUE to enriched CO_(2).We summarized 242 studies on WUE research under ambient and enriched CO_(2)conditions that were published between 1989 and 2019.Our results showed that WUE had positive responses to elevated CO_(2)with an increase of about 46%and high heterogeneity.Elevated CO_(2)increased leaf,grain,biomass and whole plant WUE by 76%,9%,30%and 37%,respectively.The effect size on leaf WUE was higher than the other three WUE types,and the effect size on whole plant WUE was higher than grain WUE (P<0.05).In another respect,the response of WUE in forests was higher than in cropland (P<0.05).Regarding different experimental methods,WUE had a stronger response to elevated CO_(2)by the method of climate-controlled chamber than by the methods of OTC (Open Top Chamber) or greenhouses(P<0.05).However,the effect size obtained by the method of greenhouse was higher than that obtained by the methods of either OTC or climate chamber for whole plant WUE (P<0.05).Furthermore,our results found WUE had a positive linear relationship with the magnitude of CO_(2)enrichment (P<0.05).Meanwhile,the effect size of elevated CO_(2)on grain WUE had a positive linear relationship with the duration of CO_(2)enrichment.This study found that the impacts of CO_(2)enrichment on WUE are unique and specific for different WUE types and the various experimental conditions.

关 键 词：CO_(2)浓度升高 水分利用效率 森林 农田 开顶式气候箱 

分 类 号：X171.1[环境科学与工程—环境科学]