| Changes in the spring rapeseed’s phenology and its response to climate change on the Qinghai Plateau |
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| DOI：10.7606/j.issn.1000-7601.2025.01.23 |
| Key Words: spring rapeseed phenological duration of growing season climate factors Qinghai Plateau |
| Author Name | Affiliation | | LI Fan | Institute of Qinghai Meteorological Science Research, Xining, Qinghai 810001, China
Qinghai Key Laboratory of Disaster Prevention, Xining, Qinghai 810001, China | | CHEN Guoqian | Institute of Qinghai Meteorological Science Research, Xining, Qinghai 810001, China
Qinghai Key Laboratory of Disaster Prevention, Xining, Qinghai 810001, China | | LI Fei | Institute of Qinghai Meteorological Science Research, Xining, Qinghai 810001, China
Qinghai Key Laboratory of Disaster Prevention, Xining, Qinghai 810001, China | | ZHAO Mengfan | Institute of Qinghai Meteorological Science Research, Xining, Qinghai 810001, China
Qinghai Key Laboratory of Disaster Prevention, Xining, Qinghai 810001, China | | ZHAO Xiling | Institute of Qinghai Meteorological Science Research, Xining, Qinghai 810001, China
Qinghai Key Laboratory of Disaster Prevention, Xining, Qinghai 810001, China | | YAN Yingcun | Institute of Qinghai Meteorological Science Research, Xining, Qinghai 810001, China
Qinghai Key Laboratory of Disaster Prevention, Xining, Qinghai 810001, China |
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| Abstract: |
| Spring rapeseed, the crop with the largest planting area on the Qinghai Plateau, was selected as the research subject. Long\|term phenological observation records from five agricultural meteorological stations (1991-2022) were analyzed to quantify the temporal and spatial variations in four key phenological stages (sowing, emergence, anthesis, and maturity) and three growth phases (vegetative growth, reproductive growth, and the entire growth period) of two cultivars, Brassica napus and Brassica rapa. Additionally, the relationship between these phenological stages and meteorological factors during the corresponding periods was examined. The results revealed significant changes in the phenology and growth stages of spring rapeseed under the influence of climate change, characterized by a substantial increase in temperature, a general rise in precipitation, and a decrease in sunshine.The phenological period of Brassica rapa was postponed at a rate of 0.22~0.44 d·a-1. The sowing and emergence stage of Brassica napus were advanced by 0.36 d·a-1 and 0.04 d·a-1, and the anthesis and maturity stages were delayed by 0.05 d·a-1 and 0.41 d·a-1, respectively. The vegetative growth stage was prolonged at a rate of 0.02~1.31 d·a-1 except that Huzhu and Menyuan were shortened by 0.24 d·a-1 and 0.15 d·a-1, respectively. The change trend of phenological period and growth stage length of spring rape was not the same, and the sensitivity to climate factor change was also different. The mean temperature was positively correlated with sowing stage, emergence stage and anthesis stage, and negatively correlated with maturity stage. The cumulative precipitation showed a significant positive correlation with sowing stage and emergence stage but a negative correlation with maturity stage. Similarly, cumulative sunshine hours were positively correlated with sowing stage and emergence stage in B. napus, but negatively correlated in B. rapa. Additionally, cumulative sunshine hours during the emergence stage exhibited a significant negative correlation with maturity stage. |
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