OALib Journal期刊
ISSN: 2333-9721
费用:99美元
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60年来中国农业水热气候条件的时空变化
DOI: 10.11821/dlxb201503002, PP. 364-379
Keywords: 温度,降水,农业水热气候条件,时空变化,中国
Abstract:
根据1951-2010年中国824个气象站点逐日观测数据选取与农作物生长密切相关的农业气候指标,按照年代将各指标站点数据空间化,求取前后期数据变化差值,分析中国农业水热气候条件的时空变化;进而对农业水热气候条件进行线性拟合,分析农业气候变化倾向。研究发现60年来全国年平均气温、0℃积温和最冷月平均气温等值线均在不同程度上向北迁移,三者在全国大部分区域表现为显著增加趋势;全国最热月平均气温分成明显的下降和上升区,显著上升区集中在东北地区、内蒙古高原与东南沿海,黄河与长江中下游地区成为下降区;全国年降水量的增加趋势并没有通过显著检验。虽然对中国农业分布格局至关重要的400mm等降水量线南段和800mm等降水量线在整体上相对稳定,但是黄河与长江中下游地区最热月平均气温的下降趋势和最冷月平均气温等值线尤其是0℃等值线逐渐从秦岭—淮河一带北移到黄河一线,这对中国作物的分布、耕作制度等会产生重要影响。因此,高温、低温与农作物生长期热量供应以及水分的复杂变化对农业的影响将因区域差异与作物种类而变化,后续的研究可以考虑更多因素来分析农作物的适宜种植范围及区域农业对气候变化的适应。
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