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为研究江南茶区茶树高温热害的时空演变特征及其风险区划。利用江南地区87个气象观测站1957-2007年逐日气象资料,结合前人研究成果,提出了茶树高温热害致灾的气象指标;利用Matlab,Arc GIS9.3及小波分析法统计并分析了51a高温热害的时空分布与多时间尺度变化规律;根据灾害等级发生的频次及强度,构建了高温热害风险指数,并利用该指数对江南地区茶树进行了风险区划。结果表明:(1)江南地区茶树轻度、中度、重度、总热害分布差异显著,基本上呈现南高北低的态势。(2)分析期内,各级灾害年际变化幅度大,呈现出先减小后增加的趋势。(3)各等级灾害存在明显的多尺度特征。(4)茶树高温热害发生的高值区主要分布在浙江金华—龙泉—衢州一带、江西景德镇—樟树—宜春以南大部分地区。该研究结果可为我国南方茶树种植布局和气象灾害防御提供参考。
In order to study the spatio-temporal evolution characteristics and risk zonation of tea tree heat damage in southern tea area. Based on the daily meteorological data of 87 meteorological stations in south China from 1957 to 2007 and the previous research results, the meteorological indexes of tea plantations causing high temperature heat damage were proposed. By using Matlab, Arc GIS 9.3 and wavelet analysis, 51a According to the occurrence frequency and intensity of disaster level, the risk index of high-temperature thermal damage was constructed, and the risk division of tea plantation in Jiangnan region was conducted by using this index. The results showed that: (1) There was significant difference in the distribution of mild, moderate, severe and total heat in tea plantations in Jiangnan area, which basically showed the trend of high in the south and low in the north. (2) During the analysis period, the interannual variation of disasters at all levels is large, showing a trend of decreasing and then increasing. (3) There are obvious multiscale features at all levels of disasters. (4) The high value area of tea plantation with high temperature and heat damage is mainly distributed in Jinhua - Longquan - Quzhou, Zhejiang Province, Jingdezhen, Jiangxi - camphor - most of Yichun. The results of this study may provide a reference for the planting layout of tea plantations in southern China and meteorological disaster prevention.