| Research advances in northward shifting of climatic\|zones and the influence on crop\|planting systems in China |
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| DOI：10.7606/j.issn81000-7601.2020.03.35 |
| Key Words: climate change climatic zones moving northward crop planting structure crop yield food security |
| Author Name | Affiliation | | HU Yanbin | Institute of Environmental Engineering, College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | XIAO Guoju | Institute of Environmental Engineering, College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | LI Yongping | Ningxia Academy of Agricultural and Forestry Sciences Guyuan Branchs, Guyuan, Ningxia 756000, China |
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| Abstract: |
| In global climate change, the most important factors influencing agroecosystem are elevated atmospheric CO2 concentration, raised air temperature, and changing precipitation. For half of a century, climate change has had an important impact on China’s crop\|planting system. This research combined the research results of experts and scholars in recent years together and did systematic analysis of climate change types in different regions such as Northeastern China, Northwestern China, Northern China, Southern China, Qinghai and Tibet, as well as the impact of northward shifts of climatic zones on crop\|planting systems and drew conclusions of regional commonality. There were clear spatial and temporal differences in climate change. For half of a century, the temperature increased in winter and summer was more significant than that in spring and autumn; the temperature in the northern region increased by 2.5℃~3.0℃, and the temperature in high latitudes and high altitudes increased by 4℃. Precipitation in Northeastern China, Northern China, Southwestern China, and east of Northwestern China decreased significantly, with a precipitation reduction rate of 10%~20%. Precipitation increased by more than 10% in Northwestern Central and Western China and Southern China. China’s multi\|planting structure gradually replaced the single\|type planting structure. The area of crops with multiple crops has expanded and the multiple cropping index has increased. The one\|cropping system advanced 200~300 km north, and the two\|cropping system and three\|cropping system advanced 500 km north. The area of multi\|cropping was expanded. The multiple crop index increased year by year at a rate of more than 1.29%. The planting boundaries of mid\|maturing and mid\|late maturing varieties are shifted to the north and the area was enlarged. Thermophilic and drought\|tolerant crops expanded in area, and the strong winter crops were gradually replaced by the winter and weak winter crops. |
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