Agro-climatic adaptation of cropping systems under climate change in Shanghai

Abstract

Climate change affects the heat and water resources required by agriculture, thus shifting cropping rotation and intensity. Shanghai is located in the Taihu Lake basin, a transition zone for various cropping systems. In the basin, moderate climate changes can cause major shifts in cropping intensity and rotation. In the present study, we integrated observational climate data, one regional climate model, land use maps, and agricultural statistics to analyze the relationship between heat resources and multi-cropping potential in Shanghai. The results of agro-climatic assessment showed that climate change over the past 50 years has significantly enhanced regional agro-climatic resources, rendering a shift from double cropping to triple cropping possible. However, a downward trend is evident in the actual multi-cropping index, caused principally by the increasing costs of farming and limitations in the supply of labor. We argue that improving the utilization rate of the enhanced agro-climatic resources is possible by introducing new combinations of cultivars, adopting more laborsaving technologies, and providing incentives to farmers.

Keywords

climate change / cropping systems / multi-cropping index / double rice / Cold Dew wind

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Acknowledgements

This research was jointly supported by China Climate Change Special Foundation of the China Meteorological Administration (No.CCSF201330 and CCSF2011-10), National Natural Science Foundation of China (No. 41371110 and 40921140410), IIASA YSSP Program, China CDM Fund (No. 1212117) and Shanghai Meteorological Service Fund(MS201418).

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2015 Higher Education Press and Springer-Verlag Berlin Heidelberg