0～50cm与0～100cm土层土壤湿度的转换关系研究  

Transforming model of soil moisture between layers of 0～50 cm and 0～100 cm

作　　者：邓天宏[1] 付祥军 申双和[1] 朱自玺 

机构地区：[1]南京信息工程大学大气科学系,江苏南京210044 [2]河南省气象科研所,河南郑州450003

出　　处：《干旱地区农业研究》2005年第4期64-68,102,共6页Agricultural Research in the Arid Areas

基　　金：科技部2001年度社会公益研究专项资金项目"黄淮平原农田节水灌溉决策服务系统研究"(2001DIB10089)

摘　　要：对郑州、南阳2个测点多年来0～100cm土壤湿度、降水(灌溉)及作物发育期资料进行了分析。结果表明,按土壤湿度随时间的变化规律,可将其划分为秋季缓慢下降期、冬季相对稳定期、春季迅速下降期和夏季增墒期4个时段。对0～50cm与0～100cm土层土壤湿度进行回归分析,当前期降水量在10mm以下时,用直线或二次曲线拟合效果良好;当前期降水(灌溉)量大于10mm时,0～50cm与0～100cm土壤湿度之比与前期降水(灌溉)量呈双曲线或二次曲线关系,拟合曲线考虑降水(灌溉)时回归效果有所提高。同一土壤类型、不同时段,或同一时段、不同的土壤类型,拟合的方程不同,反映出不同层次土壤湿度关系的复杂性。The data of soil moisture in layer of 0～100 cm, precipitation and crop growing phrases in Zhengzhou and Nanyang were analyzed. The results showed that the variation of soil moisture with time could be divided into four periods: slow descending period, relative stable period, rapid descending period and increasing period. With regressive analysis, it was found that there were linear or parabola relations of between soil moisture in layer of 0～50 cm and layer of 0～100 cm when the rainfall was less than 10 mm, while there were hyperbola or conic hyperbolic relations between S_(50)/S_(100) and precipitation (irrigation) when the rainfall (irrigation) was more than 10 mm. The regressive effect would be improved when rainfall (irrigation) was considered. But the regressive equations were different when the growing period or the soil type was different, reflecting the complexity of moisture relationship between the layers of 0～50 cm and 0～100 cm.

关 键 词：土壤湿度 转换 回归分析 

分 类 号：S152.7[农业科学—土壤学]