关键词: 砷污染, 砷污染, 小麦, 玉米, 相关性

Abstract: The paper aims to understand the temporal and spatial distribution characteristics of Wuniu early spring tea during initial picking stage and reduce its risk of spring frost in Zhejiang. Based on 71 conventional stations’daily data in 1971-2014 and 2094 regional automatic weather stations’every hour data in 2005- 2014, we took the developmental heat of Wuniu early spring tea for picking as the beginning period index and the total loss rate of the freezing levels as the freezing frost index, applied with GIS technology, used inverse distance weighting method, to get the initial picking stage zoning map and distribution map of frost risk zoning of Wuniu early spring tea in Zhejiang. The results showed that: the initial picking stage of Wuniu early spring tea in Zhejiang was from early February to early March, the date increasing from south to north, and that of coastal area in Wenzhou was the earliest, that of the south of latitude 29°N was in mid-February, that of the north of 30°N was the latest. It was suitable for planting Wuniu early spring tea in coastal areas, basin and low hilly areas in Zhejiang; the higher the altitude, the higher the risk of spring frost was, so areas with high altitude was not suitable for planting Wuniu early spring tea. The zoning results provide important references for planting layout adjustment of Wuniu early spring tea.