Effects of Elevated CO2 and Drought on Plant Physiology, Soil Carbon and Soil Enzyme Activities

被引:31
作者
Wang Yuhui [1 ]
Yan Denghua [2 ]
Wang Junfeng [1 ]
Ding Yi [1 ]
Song Xinshan [1 ]
机构
[1] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
[2] China Inst Water Resources & Hydropower Res, Beijing 100038, Peoples R China
基金
中国国家自然科学基金;
关键词
catalase; drought stress; invertase; plant growth; plant-soil-microbe system; soil C:N ratio; water use efficiency; MICROBIAL ACTIVITY; WATER-STRESS; FOREST SOIL; GROWTH; ENRICHMENT; DIOXIDE; BIOMASS; PHOTOSYNTHESIS; COMMUNITIES; ALLOCATION;
D O I
10.1016/S1002-0160(17)60458-2
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Global climate models have indicated high Probability of drought occurrences in the coming future decades due to the impacts of climate change caused by a mass release of CO2. Thus, climate change regarding elevated ambient CO2 and drought may consequently affect the growth of crops. In this study, plant physiology, soil carbon, and soil enzyme activities were measured to investigate the impacts of elevated CO2 and drought stress on a Stagnic Anthrosol planted with soybean (Glycine max). Treatments of two CO2 levels, three soil moisture levels, and two soil cover types were established. The results indicated that elevated CO2 and drought stress significantly affected plant physiology. The inhibition of plant physiology by drought stress was mediated via prompted photosynthesis and water use efficiency under elevated CO2 Condition's. Elevated CO2 resulted in a longer retention time of dissolved organic carbon (DOC) in soil, probably by improving the soil water effectiveness for organic decomposition and mineralization. Drought stress significantly decreased C:N ratio and microbial biomass carbon (MBC), but the interactive effects of drought stress and CO2 on them were not significant. Elevated, CO2 induced an increase in invertase and catalase activities through stimulated plant root exudation. These results suggested that drought stress had significant negative impacts on plant physiology, soil carbon, and soil enzyme activities, whereas elevated CO2 and plant physiological feedbacks indirectly ameliorated these impacts.
引用
收藏
页码:846 / 855
页数:10
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