摘要
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。
The method of simulating diagnosis was derived for the research of foliar optimum nutrient status from the sample plots which were the treatments of experiment on amelioration and increasing fertility with Ⅰ-69 poplar (Populus deltorides Bartr. cv. 'Lux') on Sajong black soil. By canonical correlation analysis, sampling time was selected, and foliar mutriment elements closely related to forest tree growth were determined.Parabolic function was taken as the diagnosis function of optimum nutrient status in foliar. While selecting the variable of diagnosis function,content of foliar nutrient and the proportion of nutrients were considered. It was concluded that optimum foliar nutrient status for Ⅰ-69 poplar was as follows: The leaf content of P_2O_5 was 0.55—0.75% in July in the first year after plantation; N was 3.20—4.20% in the next year; N was 3.00—3;70% in May in the third year; N/K was 1.00—1.60 in the fourth year.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1991年第1期1-7,共7页
Scientia Silvae Sinicae
基金
砂姜黑土改土培肥对林木生长效应研究课题
关键词
杨树
叶片养分
营养诊断
营养模型
Poplar forliage nutrient
Nutrition diagnosis
Foliar nutrient critical valu
Nutrition model
