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为研究叶片最适养分状态,提出了模拟诊断方法。将砂姜黑土上Ⅰ-69杨(Populus deltoides Bartr.cv.“Lux”)的改土培肥试验各处理作为模拟诊断的样地。用典型相关分析方法选择采样时间、确定与林木生长有密切关系的叶片养分元素。用抛物线函数作为叶片最适养分状态的诊断函数。选择变量同时考虑叶片养分的含量和养分之间的比例。经过4年多的研究得出Ⅰ-69杨最适叶片养分状态为:造林第1年7月叶片含P_2O_50.55—0.75％;造林后第2年7月叶片含N3.20—4.20％;造林后第3年5月含N3.00—3.70％;造林后第4年5月叶片中的N/K为1.00—1.60。
In order to study the optimum nutrient status of leaves, a simulation diagnosis method was proposed. Populus deltoides Bartr.cv. “Lux”) was used as the site for simulative diagnosis. The canonical correlation analysis method was used to select the sampling time to determine the leaf nutrient elements closely related to forest growth. Use the parabolic function as a diagnostic function for the optimal nutrient status of leaves. Variables are selected taking into account the ratio of nutrient content to nutrient content in the leaves. After more than four years of research, the optimal nutrient status of young I-69 was: P 2 O 50.55-0.75% in July of the first year of afforestation; N 3.20-4.20% in July of the second year after afforestation; The first 3 years after afforestation in May with N3.00-3.70%; 4 years after afforestation in April leaf N / K 1.00-1.60.