| Cite this article: | 李倩,高阳,王兴鹏,等.温度升高和干旱对农田生态系统水碳交换动态影响的研究进展[J].灌溉排水学报,0,():-. |
| LI Qian,GAO Yang,WANG Xingpeng,et al.温度升高和干旱对农田生态系统水碳交换动态影响的研究进展[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Research progress on Effects of Temperature rise and Drought on Water and Carbon Exchange Dynamics in Farmland Ecosystem |
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LI Qian1, GAO Yang2, WANG Xingpeng1, YANG Yingpan1
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1.College of Water Resource and Architecture Engineering，Tarim University;2.Farmland Irrigation Research Institute，Chinese Academy of Agricultural Sciences
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| Abstract: |
| Climate change seriously threatens the sustainable development of global agricultural production. The occurrence frequent of extreme weather, such as warming and drought, is the main embodiment of global climate change. Air warming has significant effects on the performance and function of soil-crop system. Although moderate drought usually improves plant water use efficiency (WUE), it is necessary to deeply understand the mechanism of warming and drought on water and carbon dynamics in farmland ecosystem by revealing the interaction between farmland eco-function and environmental factors and its scale effects. Different plants have different strategies of water utilization, and their physiological and morphological characteristics present significant differences in response to drought. In this paper, the effects of warming and drought on water and carbon dynamics in farmland ecosystem were reviewed from the following aspects: (1) analysis of global climate change and its influencing factors, (2) effects of warming 、drought and other climate change factors on water carbon dynamics in farmland ecosystem, (3) existing problems and future research directions. Literatures indicated that Under the background of warming caused by increasing world population and carbon emissions from fossil fuel combustion, the increase of temperature and the increase of drought frequency will affect the water and carbon dynamics of farmland ecosystem to a certain extent.. Warming changes the amount of biomass in the farmland system, and affects crop growth and water use process. In addition, the increase of temperature accelerates the conversion of soil active organic carbon, and reduces soil organic carbon retention. Drought reduces the photosynthetic rate, respiration rate and transpiration rate of plants, and the water use efficiency of the ecosystem will be decreased under extreme drought conditions. Meanwhile, it will decrease the transformation and decomposition ability of soil microorganisms, thus inhibit the release of soil CO2. Climate change will also be accompanied by the change of precipitation pattern, which will further affect soil respiration, and the increase of precipitation will inhibit soil respiration, thus slowing down the process of water and carbon cycling in farmland.However, there are still some deficiencies in studies on the dynamics of water and carbon cycles under warming and drought conditions, e.g., more studies focus on single environmental factors than on multiple stresses. In the future, it is necessary to strengthen researches on water and carbon cycles in soil-crop system under the conditions of multiple factors (such as water content, temperature, concentration, etc.), in order to provide the mechanism of temperature and drought on the function of farmland ecosystem. |
| Key words: Air warming; Drought; Biomass; Water and carbon cycle; Farmland system |
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