摘要
利用2011-2015年贵州喀斯特区域53个土壤湿度自动观测站逐日土壤湿度观测及气象台站观测资料,应用EOF分析了10~100 cm土壤湿度空间分布特征以及与可能蒸散和降水的关系,结果表明:(1)10~20,30~50,60~100 cm空间分布较为相近,威宁、沿河、正安、印江、思南地区各层土壤湿度较小,铜仁、安顺、都匀地区均较大。(2)10~50 cm土壤湿度7、9月中旬相对偏低,3、5月中旬居中,11、1月中旬偏高; 60~100 cm土壤湿度相差不大。(3)10~100cm土壤湿度场方差累计贡献率超过98%,第一主分量最大值在黔西北及东南等地区,最小值在黔西地区;(4)镇远、纳雍、凤冈春季可能蒸散对土壤湿度的影响较小;夏季可能蒸散对10~50 cm影响的滞后时间为一旬,60~100 cm相关性较低;秋季可能蒸散对10~50 cm土壤湿度滞后一或两旬,与60~100 cm滞后不明显;冬季可能蒸散对10~50 cm土壤湿度的影响较小。(5)春季,镇远降水对10~60 cm土壤湿度影响的滞后时间为两旬,纳雍降水对土壤湿度影响不明显,凤冈春季降水对10~30 cm土壤湿度滞后时间为当旬或一旬;夏季镇远、纳雍、凤冈降水对10~30 cm土壤湿度滞后当旬或一旬;秋季镇远、纳雍、凤冈降水对土壤湿度影响不明显。冬季镇远、凤冈降水对10、20 cm影响滞后时间为一旬。
According to the daily soil moisture and soil humidity observation data from 2011 to 2015 of 53 automatic observatory stations and meteorological stations in Guizhou karst region, the EOF is applied to analyze the soil moisture spatial distribution characteristics of 0 - 100 cm layer and the relationship with possible evapotranspiration and precipitation. The results show that： ① the spatial distribution status of 10 ~20 cm layer, 30~50 cm layer, and 60- 100 cm layer is similar; the soil moisture of Weining, Yanhe, Zhengan, Yinjiang and Sinan is smaller, while that of Tongren, Anshun, Duyun area is larger. ② The soil moisture in 10~ 50 cm soil layers is relatively low in middle July and September, mid-March and mid-May, and high in mid-November and mid-January. The soil moisture in 60- 100 cm soil layers is little different. ③ The first principal component and the second principal component of soil moisture field converge rapidly in 10- 100 cm soil layer, and the cumulative contribution rate of variance is over 98%, the maximum value of the first main component is in the northwest and southeast of Guizhou, and the minimum value is mainly in the west of Guizhou. ④ The effect of potential evapotranspiration on soil moisture is little in spring. In summer, the lag time of the effect of evapotranspiration are 10 days for 10-50 cm layer, the correlation of 60~ 100 cm layer are low. In autumn, the lag time of 10-50 cm layer are 10 or 20 days, with a low correlation between 60- 100 cm layer. In winter, the potential evapotranspiration has less effect on 10-50 cm layer soil moisture. ⑤In spring, the lag time of precipitation effecls on soil humidity in Zhenyuan is two ten-day for 10-60 em layer, not obvious in Nayong, a ten-day in 10-30 em layer in Fenggang; lu smmuer, the lag lime of precipitation effects on soil humidity of 10-30 cm layer is a ten-day in Zhenyuan, Nayong and Fenggang; In autumn, the effects of tile precipitation on the soil moisture are not obvious; In winter, the lag time of precipitation
作者
袁淑杰
何兴潼
何源
谷晓平
潘媞
于飞
YUAN Shu-jie;HE Xing-tong;HE Yuan;GU Xiao-ping;PAN Ti;YU Fei(Chengdu University of Information Technology,Chengdu 610225,China;Guizhou Institute of mountainenvironment climate,Guiyang 550002,China;Meteorological Service Center of Siehuan Meteorological Bureau,Chengdu 610072,China)
出处
《节水灌溉》
北大核心
2018年第10期83-90,96,共9页
Water Saving Irrigation
基金
国家自然科学基金项目(41365008)
干旱气象科学基金项目(IAM201304)
国家重点基础研究发展计划(973计划)项目(2013CB430206)
关键词
贵州省
土壤湿度
气象要素
蒸散
Guizhou province
soil moisture
meteorological factors
evapotranspiration
