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对雷州半岛纪家林场桉树人工林小集水区 1 999- 2 0 0 0年度干季土壤水分及林内小气候的定位观测结果进行典型相关分析 ,得出以下结论 :(1 )地下 0～ 4m深土壤层间 (即SM5 0 ,SM1 5 0 ,SM2 5 0 ,SM35 0 )表示含水量差异极显著 ,下层土壤含水量高于上一层 ;(2 )最高温度 (Tmax)和最低温度 (Tmin)对土壤含水量 (SWC)变化的权重系数分别为 1 2 6 0和 0 84 0 ;影响较深层次 (即SM1 5 0 ,SM2 5 0 ,SM35 0 )土壤含水量变化的因素是水汽压差 (VPD)、Tmin、辐射 (Rs)、Tmax,其中SM35 0和降雨量 (Pr)相关性显著 (P =0 0 0 1 ) ;影响浅层 (SM5 0 )SWC变化的主要因素是Pr 和风力 ;(3)气象因子与SWC间典型相关系数分别为 0 84 1和 0 5 4 8(P =0 0 0 1 ) ;气象因子与SWC变量间的复相关系数为 0 70 7;(4 )气象因子通过第一典型相关变量 (U1 ,W1 )可解释SWC总变异量的4 0 4 % ,2个典型变量 (U1 ,W1 )和 (U2 ,W2 )共可解释SWC总变异量的 4 3 0 %。U1 可解释SWC自身变异量的5 7 2 % ;(5 )气象因子中主要是Tmax、Tmin、Rs 影响SM35 0、SM2 5 0、SM1 5 0三层的SWC。
A typical correlation analysis was made between the observed results of soil moisture and microclimate in a small catchment area of Jiculin Forest Plantation in Jijia Forest Farm of 1999-2002000 in Leizhou Peninsula, and the following conclusions were drawn: (1) Ground depth of 0 ~ 4m The difference between the soil layers (ie, SM50, SM150, SM250, SM350) indicates that the water content is significantly different and the soil moisture content in the lower layer is higher than the upper layer. (2) The maximum temperature (Tmax) and the minimum temperature The weight coefficients of soil water content (SWC) were 1206 0 and 0 84 0, respectively. The factors influencing the soil water content at deeper levels (ie, SM1 50, SM2 50, SM35 0) were water vapor pressure difference VPD, Tmin, Rs and Tmax, and the correlation between SM35 0 and rainfall (Pr) was significant (P = 0 0 01). The main factors influencing the SWC of SM5 0 were Pr and wind force. (3) The typical correlation coefficients between meteorological factors and SWC are 0 841 and 0 5 48, respectively (P = 0 0 0 1); the complex correlation coefficient between meteorological variables and SWC variables is 0 707; (4) The meteorological factors The first typical correlation variable (U1, W1) can explain 40% of the total variation of SWC. The two typical variables (U1, W1) and (U2, W2) can explain 4 30%. U1 can explain 5 7 2% of the variation of SWC itself; (5) Among the meteorological factors, Tmax, Tmin and Rs mainly affect the SWC of SM35 0, SM2 50 and SM1 50.