作　　者： ; ; ;

机构地区： 韶关学院英东生物工程学院

出　　处： 《林业科学》 2003年第5期10-17,共8页

摘　　要： 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。 The use of Eucalyptus as plantation trees in the tropics has been criticized in the world wide on the grounds that they consume water in excessive amounts, but it is no general answer to the question of whether Eucalyptus consume water in excessive quantities because site conditions, climate and species all influence water use. In south China, however, there is little information on water use by Eucalyptus plantations. The purpose of this paper was to discuss effects of meteorological factors on dry seasonal dynamics of soil water content in Eucalyptus plantation on Leizhou peninsula of southern China. Based on the data obtained from locate oriented observation throughout the dry season from Oct. 1999 to Mar. 2000, the method, canonical correlation analysis, which could puts emphasis upon holistic meteorological factors and soil water content(SWC), was employed to analyze the relationship between them. The main results indicated as followings:(1)Soil water content varied markedly in different layers and mean water content of layers increased with the depth of soil( P =0 001);(2)The coefficient of weight for daily maximum temperature( T max )and minimum temperature( T min )was 1 260 and 0 840 ,respectively. And the main meteorological factors that changed soil water content of deeper layers(SM150, SM250, SM350)were vapour pressure deficit( VPD ), daily minimum temperature( T min ),solar radiation ( R s ), and maximum temperature ( T max ); SWC at SM350 had a significant relationship with precipitation ( P r )( P =0 001), while the main factors influencing SWC at SM50 were P r and wind speed.(3)The canonical correlation coefficients between canopy meteorological factors and SWC were 0 841 and 0 548( P =0 001), respectively. And the multiple correlation coefficients between the two canonical variables was 70 7%;(4)The total variance in soil water content explained by first canonical covariates ( U 1,W 1 ) was 40 4%. The two canonica

关 键 词： 典型相关法 桉树 人工林 干季 土壤水分 影响因子 定位观测 含水量 权重系数

领　　域： [农业科学] [农业科学] [农业科学]