摘要
利用1981-2015年辽宁省4-5月(春播期) 19个农业气象站0～20 cm层土壤相对湿度、降水和气温资料,分析了土壤相对湿度的空间分布、长期变化状况、突变和周期性特征及其与气候影响因子的相关关系,结果表明:近35a土壤湿度区域性变化显著,辽西地区土壤湿度减少(干旱化程度加剧),辽东地区土壤湿度增加;土壤湿度年际波动较大,没有明显的长期变化趋势,主要经历了平稳-偏干-偏湿3个时期,不存在明显的突变点,4月和5月分别存在4～7 a和准2 a的周期; 2000年以后土壤湿度稳定性增大,发生土壤异常偏干和偏湿的极端事件显著增多,尤其是在辽西干旱地区表现最为明显; 4月土壤湿度与前秋降水相关显著,秋季降水冬季封冻在土壤中,次年春季土壤融化返浆,土壤湿度增加,5月土壤湿度与同期降水和气温相关显著,相关系数均通过了α=0.01的显著性检验。
Based on data of relative humidity,precipitation and temperature in the depth 0~20 cm of 19 agricultural weather stations in Liaoning Province from 1981 to 2015,the spatial distribution,long-term changes,the catastrophe features,the periodic characteristics of soil relative humidity were analyzed.The results showed that there was a significant change in soil moisture in the past 35 years.Soil moisture in Liaoxi area decreased(the degree of drought),soil moisture in Liaodong area increased and soil moisture fluctuated yearly.There was no obvious long-term trend and mainly experienced a smooth-partial dry-partial wet three periods.There was no obvious point of change in April and May.There were 4~7 a and quasi-2a cycle respectively.The stability of soil moisture enhanced after 2000.The frequency of soil abnormal dry and extremely wet events increased significantly,especially in the most obvious performance in arid areas of western Liaoning.Soil moisture in April related to autumn precipitation stored in winter frozen soil.Next spring soil melt back to the pulp increased soil moisture.Soil moisture in May related significantly(α=0.01)to the precipitation and temperature in the same period
作者
胡春丽
李辑
焦敏
王婷
李雨鸿
林蓉
王阳
HU Chun-li;LI Ji;JIAO Min;WANG Ting;LI Yu-hong;LIN Rong;WANG Yang(Liaoning Institute of Meteorological Science,Shenyang,Liaoning 110166,China;Shenyang Regional Climate Centre,Shenyang,Liaoning 110016,China)
出处
《干旱地区农业研究》
CSCD
北大核心
2018年第5期277-283,共7页
Agricultural Research in the Arid Areas
基金
国家自然科学基金项目(41605087)
中国气象局省级气象科研所科技创新发展项目(201708)
关键词
土壤湿度
变化特征
气候影响因子
辽宁省
soil humidity
change characteristics
climate influencing factor
Liaoning Province
