中国油料作物学报 ›› 2019, Vol. 41 ›› Issue (6): 894-.doi: 10.19802/j.issn.1007-9084.2019046

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Climate impacts on yield of winter oilseed rape in different growth regions of the Yangtze River Basin


  1. .College of Resources and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conserva?
    tion (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Wuhan 430070, China
  • Online:2019-12-28 Published:2019-12-20

Abstract: Meteorological factors strongly affected oil rape (Brassica napus L.) growth in the Yangtze River Ba? sin, the most important rapeseed growth area in China. To better understand the key factors in different regions of the basin area, spatial and temporal distribution features of climatic factors in 5 different regions were analyzed based on 1961-2015 data from 259 meteorological stations and 1437 field experiments. Results showed that climate condition during the growing period of winter rapeseed in the Basin was on the average of 13.2 °C, 3620 °C of accu? mulated temperature above 0 °C, 7.8 °C of diurnal temperature variation, 984 h of sunshine duration, and 2631 MJ· m-2 of solar radiation. Heat resources increased during rapeseed growth period, with an average increase of 0.37 °C in every decade, and diurnal temperature variation decrease by 0.21 °C during every decade. Sunshine duration de? creased in each year with 45 h less in every decade. Total precipitation in whole growth period was 680 mm on aver? age and increased in each year. The relationship between meteorological factors and rapeseed yield were analyzed. Negative correlation was found between different average temperature and accumulated temperature above zero. Ev? ery 0.1 °C increase of average temperature led to 53 kg·hm-2 yield loss in double cropping system areas of the mid? 2019,41(6):894-903 dle reaches from Sept. to Nov., and 40 kg·hm-2 yield loss in triple cropping system areas of the middle reaches from the next Mar. to May. On the contrary, every 0.1 °C increase of diurnal temperature variation led to yield increase of 39 kg·hm-2 especially in the low altitude areas in upper reaches. There was negative correlation between yield and precipitation. Especially in late stage, yield decreased 12-39 kg·hm-2 when late precipitation increased by 10 mm. Considering the 4 regions in the whole period, yield were affected mainly by diurnal temperature variation, precipita? tion and sunshine durations in low and high altitude areas in upper reaches; by temperature, accumulated tempera? ture, precipitation and solar radiation on the middle reaches; and by precipitation, sunshine durations and solar radi? ation on the lower reaches.

Key words: winter oilseed rape (Brassica napus L.);the Yangtze River Basin;diurnal temperature differ? , precipitation;sunshine durations;solar radiation