海南省农业气象自动站土壤水分状况分布特征

利用海南省18个农业气象自动观测站土壤水分状况观测资料，分析了海南省农业气象自动站土壤水分状况特征。结果表明：土壤质地分为粘土、粘壤土和砂土三大类，以粘土、粘壤土为主；凋萎系数的大小与土壤质地、测定作物品种有关，凋萎系数从小到大顺序排列为细砂土、粉砂土、粉壤土、粘壤土、粘土。不同土壤质地间土壤容重差别不大，土壤容重随土壤深度略有增加；粘土田间持水量最大，其次为粘壤土、砂粘土、粉砂土、粉壤土，田间持水量最少的是细砂土。

The Variation Characteristics of Soil Moisture State Observed Agricultural Meteorology Automatic Stations in Hainan ProvinceChen Zhenli1,2

The automatic observation data of the soil moisture state from 18 agricultural meteorology automatic stations are uesed to investigate the variation characteristics of soil moisture state in Hainan Province. Results show that the soil texture in Hainan Province are divided into three categories: clay, clay loam and sand soil, and the main is clay, clay loam. It has the relationship between the value of the wilting coefficient and the soil texture and the determination of the crop varieties. The coefficient of wilting is arranged from small to large in order of fine sand soil, silty soil, silt loam, clay loam, clay. The soil bulk density is little difference between different soil texture. And it is slightly decrease with the soil layer. The value of the field capacity is largest in clay, followed by clay loam, sand clay, silty soil and silt loam. And the smallest is fine sand soil.