苏北滨海典型滩涂土壤温度的极值分析

The analysis on diurnal extreme soil temperature in typical coastal region in north Jiangsu province

通过对苏北滨海典型滩涂野外观测点14个月不同深度土壤日最高温度和日最低温度的分析与曲线拟合,结果表明,不同深度的土壤的日最高温度和最低温度均呈正弦曲线变化,其决定系数均不低于0.767,距地表越近土壤日最高温度和最低温度的波动幅度越大,日温差也越大,同一层土壤日最高温度的波动幅度比日最低温度大,当土壤深度增至30 cm后,波动幅度减小,日温差接近零,同一层土壤日最高温度和最低温度的波动幅度也相差无几。

The simple analysis and curve fitting based on the diurnal maximum, minimum and diurnal range of soil temperature at different depth at field experimental site in typical coastal region of north Jiangsu province during fourteen months, showed that the variation of the diurnal maximum and minimum soil temperature approximate to sine curve in all depths, and all the coefficient of multiple determinations （R^2） were equal to or higher than 0.767. As soil depth increased, diurnal maximum and minimum of soil temperature fluctuated more and more weakly, and diurnal range was near to zero.