ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 47 Issue 12 > 2021,47(12):1537-1545. DOI:10.7519/j.issn.1000-0526.2021.12.009 Prev Next
Variation Characteristics of Chilling Dew Wind for Double-Season Late Rice Across Southern China in 2020
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Abstract:
Based on land use/cover change dataset at a resolution of 30 m×30 m, the characteristics of chilling dew wind in 2020 are analyzed for double-season late rice by using the information of underlying surface, gridded monitoring degree and chilling dew wind index. It is shown that the chilling dew wind in 2020 is characterized by earlier start date, longer duration and general low-to-heavy degree occurrence across double-season rice area. There is 24.7% of late rice area exposed to chilling dew wind, which is the third largest since 2000. The area percentages of low, medium and heavy chilling dew winds are 9.7%, 12.8% and 4.9%, respectively. In terms of the statistic in provinces, it is obvious that the area percentage of late rice area affected by chilling dew wind is more than 90% in Hunan, Jiangxi and Zhejiang, but is less than 30% in other provinces. The area percentage subjected to chilling dew wind in Hunan, Hubei, Anhui and Jiangsu is the largest since 2020, and Jiangxi has the largest area percentage of heavy chilling dew wind since 2000. The light degree of chilling dew wind occurs in 〖JP2〗Zhejiang, Fujian and Guangxi, and the occurrence area of chilling dew wind in Guangdong is small. The integrated index for chilling dew wind in double-season late rice area is 4.21 in 2020, which is the second largest since 2000. Moreover, the indexes in Hunan, Jiangxi and Hubei reach 7.16, 7.16 and 12.59, which is the second largest, the largest and the largest since 2000, respectively.
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