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Future cereal production in China: The interaction of climate change,water availability and socio-economic scenarios

文献类型： 会议论文

第一作者： Xiong Wei

作者： Xiong Wei 1 ; Conway Declan 2 ; LinErda 1 ; Xu Yinlong 1 ; Ju Hui 1 ; JiangJinhe 3 ; Holman Ian 4 ; Li Yan 5 ;

作者机构： 1.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China The Key Laboratory for Agro-environment & Climate Change, Ministry of Agriculture, Beijing 100081, China

2.School of Development Studies/Tyndall Centre for Climate Change Research, University of East Anglia, Norwich NR4 7TJ. United Kingdom

3.Institute of Quantitative and Technical Economics, Chinese Academy of Social Sciences, Beijing 100732. China

4.Natural Resources Department. Cranfield University. Bedfordshire MK43 OAL United Kingdom

5.Water Resources Information Center, The Ministry of Water Resources. Beijing 100053, China

关键词： China;Food production;Climzte change;water availability;Scenarias;Adipation

会议名称： International training workshop on regional climate change and its impact assessment

主办单位：

页码： 175-185

摘要： Food production in China is a fundamental component of the national economy and driver of agricultural policy. Sustaining and increasing output to meet growing demand faces significant challenges including climate change, increasing population, agricultural land loss and competing demands for water. Recent warming in China is projected to accelerate by climate models with associated changes in precipitation and frequency of extreme events. How changes in cereal production and water availability due to climate change will interact with other socioeconomic pressures is poorly understood. By linking crop and water simulation models and two scenarios of climate (derived from the Regional Climate Model PRECIS) and socio-economic change (downscaled from IPCC SRES A2 and B2) we demonstrate that by the 2040s the absolute effects of climate change are relatively modest. The interactive effects of other drivers are negative, leading to decreases in total production of -18% (A2) and -9% (B2). Outcomes are highly dependent on climate scenario, socio-economic development pathway and the effects of CO2 fertilization on crop yields which may almost totally offset the decreases in production. We find that water availability plays a significant limiting role on future cereal production, due to the combined effects of higher crop water requirements (due to climate change) and increasing demand for non-agricultural use of water (due to socio-economic development). Without adaptation, per capita cereal production falls in all cases, by up to 40% of the current baseline. By simulating the effects of three adaptation scenarios we show that for these future scenarios China is able to maintain per capita cereal production, given reasonable assumptions about policies on land and water management and progress in agricultural technology. Our results are optimistic because PRECIS simulates much wetter conditions than a multi-model average, the CO2 crop yield response function is highly uncertain and the effects of extreme events on crop growth and water availability are likely to be underestimated.

分类号： P458

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