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1971～1973年在火炬松(Pinustaeda L)林分内设置了10个施肥试验区,1979年对其针叶和落叶中N、P含量进行了5次测定。用树干材积对肥料的反应与试验前林分胸高断面积进行回归分析,将养分作为自变量,剩余标准差作为依变量。在初秋,火炬松叶部养分含量与其对N肥反应的剩余标准差紧密相关,因而是最好的取样时间;而落叶中N/P比不论在冬末、春末,还是在秋初都与对N肥反应的剩余标准差呈显著相关。P肥反应剩余标准差在各取样期均与叶内营养相关显著,与落叶中N/P比除冬末外,在各取样期亦呈紧密相关。最大相关系数R~2(0.73)出现于P肥反应剩余标准差对春末叶部N/P比的回归分析中。N+P肥反应剩余标准差与针叶及落叶中养分均无显著关系。
From 1971 to 1973, 10 fertilization experiment zones were set up in the Pinus taeda L. The contents of N and P in needle and deciduous leaves were determined five times in 1979. The response of the trunk volume to the fertilizer and the chest area of the forest before the test were analyzed by regression analysis. Nutrients were taken as independent variables and the residual standard deviation was taken as the dependent variable. In early autumn, the nutrient content of loblolly pine leaves was closely related to the residual standard deviation of N fertilizer response, which was the best sampling time. However, the N / P ratio of deciduous leaves was higher in winter, late spring and early autumn There was a significant correlation between the residual standard deviation of N responses. The residual standard deviation of P fertilizer response was significantly correlated with leaf nutrition at each sampling period, and was also closely related to deciduous N / P ratio at the end of winter and at each sampling period. The maximum correlation coefficient R ~ 2 (0.73) appeared in the regression analysis of residual standard deviation of P fertilizer response to N / P ratio of leaf at the end of spring. N + P fertilizer residual standard deviation and the leaves and leaves of nutrients were not significantly correlated.