浙江省茶树冬季冻害时空分布特征

为了分析浙江省茶树冬季冻害时空分布特征。本研究提出了茶树冬季冻害的气象指标和等级划分,基于该指标和全省64个基本气象站1971—2011年气象数据,采用经验正交函数和小波分析方法,研究了浙江省茶树冬季冻害的空间分布和时间演变特征。结果表明,茶树轻度、中度和重度冬季冻害第1模态能总体反映冬季冻害发生的多年平均状况。轻度和重度冬季冻害第1模态空间分布均表现为全省一致为正,轻度和重度高值区均位于浙江省西北部等地;中度冬季冻害第1模态空间分布表现为除温州东部、台州东南部地区外,其余地区都为负值,其特征向量绝对值的最大值位于浙北、浙中地区。研究结果可为茶树生产提供科学依据。

Temporal and Spatial Distribution of Winter Freezing of Tea Trees in Zhejiang

In order to analyze the temporal and spatial distribution of winter freezing of tea(Camellia sinensis) in Zhejiang province, the meteorological indexes and hierarchies of tea trees winter freezing were proposed in the article. With the indexes and the data in the 64 meteorological stations around the province during 1971-2011, the temporal and spatial distribution of winter freezing of tea trees in Zhejiang province was analyzed using the empirical orthogonal function(EOF) and wavelet analysis. The results showed that the first EOF mode for the mild, moderate and severe winter freezing could reflected the average case of the whole province. The spatial distribution of first EOF mode for the mild and severe frost were all positive in the whole province, and both high value of mild and severe were around northwest Zhejiang. The EOF mode for moderate were overall negative, except east Wenzhou, southeast Taizhou. The maximum absolute values of the mode were around north and middle Zhejiang. The results could provide a scientific basis for tea trees production.