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How Elevated CO2 Shifts Root Water Uptake Pattern of Crop? Lessons from Climate Chamber Experiments and Isotopic Tracing Technique

文献类型：期刊论文

作者Ma, Ying1,2; Wu, Yali1,3; Song, Xianfang1,2
刊名WATER
出版日期2020-11-01
卷号12期号:11页码:15
关键词elevated CO2 root water uptake stable isotopes maize
DOI10.3390/w12113194
通讯作者Ma, Ying(maying@igsnrr.ac.cn)
英文摘要Root water uptake plays an important role in water transport and carbon cycle among Groundwater-Soil-Plant-Atmosphere-Continuum. The acclimation of crops under elevated carbon dioxide concentrations (eCO(2)) depends greatly on their capability to exploit soil water resources. Quantifying root water uptake and its relationship with crop growth under eCO(2) remains challenging. This study observed maize growth subjected to current CO2 (400 ppm) and eCO(2) (700 ppm) treatments via a device combined with a climate chamber and weighing lysimeters. Root water uptake patterns were determined based on the isotopic tracing technique. The main water uptake depth shifted from 0-20 cm under current treatment to 20-40 cm under eCO(2) at the seedling growth stage. Maize took up 22.7% and 15.4% more soil water from a main uptake depth of 40-80 cm at jointing and tasseling stages in response to eCO(2), respectively. More soil water (8.0%) was absorbed from the 80-140 cm layer at the filling stage under eCO(2). Soil water contributions at the main uptake depth during seedling stage were negatively associated with leaf transpiration rate (T-r), net photosynthetic rate (P-n), and leaf area index (LAI) under both treatments, whereas significant positive correlations in the 40-80 cm layer under current treatment shifted to the 80-140 cm layer by eCO(2). Deep soil water benefited to improve T-r, P-n and LAI under both treatments. No significant correlation between soil water contributions in each layer and leaf water use efficiency was induced by eCO(2). This study enhanced our knowledge of crop water use acclimation to future eCO(2) and provides insights into agricultural water management.
WOS关键词STABLE-ISOTOPES ; BIOENERGY CROPS ; ATMOSPHERIC CO2 ; WINTER-WHEAT ; SUMMER MAIZE ; PHOTOSYNTHESIS ; EVAPOTRANSPIRATION ; GROWTH ; YIELD ; ENRICHMENT
资助项目National Natural Science Foundation of China[41671027] ; National Natural Science Foundation of China[41730749]
WOS研究方向Water Resources
语种英语
WOS记录号WOS:000594234800001
出版者MDPI
资助机构National Natural Science Foundation of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/156451]  
专题中国科学院地理科学与资源研究所
通讯作者Ma, Ying
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
3.Chinese Res Inst Environm Sci, Natl Engn Lab Lake Pollut Control & Ecol Restorat, Beijing 100021, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Ying,Wu, Yali,Song, Xianfang. How Elevated CO2 Shifts Root Water Uptake Pattern of Crop? Lessons from Climate Chamber Experiments and Isotopic Tracing Technique[J]. WATER,2020,12(11):15.
APA Ma, Ying,Wu, Yali,&Song, Xianfang.(2020).How Elevated CO2 Shifts Root Water Uptake Pattern of Crop? Lessons from Climate Chamber Experiments and Isotopic Tracing Technique.WATER,12(11),15.
MLA Ma, Ying,et al."How Elevated CO2 Shifts Root Water Uptake Pattern of Crop? Lessons from Climate Chamber Experiments and Isotopic Tracing Technique".WATER 12.11(2020):15.

入库方式： OAI收割

来源：地理科学与资源研究所

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