近5年贵州喀斯特区域土壤湿度变化规律的研究
- 文章编号:
- 2096-1618(2017)增-0057-07
- 摘要:
- 为分析贵州喀斯特区域土壤湿度的时空分布特征和变化规律,通过利用贵州省2011-2015年53个地面气象观测站的日平均降水量和53个自动土壤水分观测站日平均旱地土壤相对含水量资料,结合相关性分析和多元线性回归等方法,得到的结果如下:(1)贵州省的土壤湿度和降水量的空间分布变化较为一致。(2)根据气温和降水对贵州划分了农业气候区,春干区4、5月份和伏旱区的8、9月份都处于中旱状态,高寒区4、5月处于重旱状态,温凉农业气候区和湿润农业气候区的土壤湿度值则较高。(3)贵州省土壤开始增湿的时间存在着地区差异,大致上从20 cm开始向深层每隔一定深度开始增湿的时间向后推迟1旬左右,且浅层土壤湿度不如深层土壤湿度稳定。(4)降水和气温是影响土壤湿度的主要因素,一般土壤湿度与降水呈较为显著的正相关关系,与气温呈显著负相关,并根据其相关程度建立了数学模型,定量说明了降水和气温相互制约的影响着土壤湿度的变化。
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备注/Memo
收稿日期:2016-11-11 基金项目:国家自然科学基金资助项目(41365008); 成都信息工程大学科研基金资助项目(KYTZ201305)