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中国东部土壤温度、湿度变化的长期趋势及其与气候背景的联系

, PP. 181-191

Keywords: 土壤温度,土壤湿度,气温和降水,长期趋势

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Abstract:

利用1971—2000年中国722站逐月的土壤温度资料和1981—1998年178站逐旬的土壤湿度观测资料,分析了中国东部土壤温度、湿度变化的长期趋势及其与气温、降水变化的关系。结果表明①我国东部土壤温度的变化在年际—年代际时间尺度上存在明显的区域性差异,其中东北地区表现为持续上升型,而西北东部—华北、江淮和西南—华南地区均为先降后升型;②1970—2000年代,土壤温度的变化在东北以及西北东部—华北地区有显著的上升趋势,而在江淮和西南—华南地区,总体而言变化趋势不显著。此外,1980—1990年代,各区域土壤湿度的变化趋势均不显著;③在年际—年代际尺度上,各区域土壤温度和气温的变化具有显著的正相关关系,而土壤湿度与土壤温度的变化普遍呈负相关关系,其中尤以西北东部—华北地区最为显著。而在较长的时间尺度上,土壤湿度与降水的变化仍然存在较好的正相关关系。?

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