四川巨桉人工林的养分因子与营养诊断

采用相关分析法对四川省60个巨桉标准地养分限制因子进行分析.结果表明:四川巨桉人工林生长量受土壤交换性Ca、Mg,土壤速效P影响最大;而N、K、Mn等由于土壤中含量相对较为充足,限制作用较小;Fe、Cu、Zn等影响较小,但综合效应不可忽视.植物叶片Ca、Mg、P、Fe、B、N、Zn、Cu等是重要的养分含量指标,可作为养分供应和吸收状况的标志.在养分平衡关系中,N、Ca、Zn、Cu、P、Mn等与其他养分元素之间的平衡关系更加重要,表现为高N、Zn、Cu、Mn,低P、Ca有利于林分高、林分直径、林分蓄积等产量指标的增加.

Research on restrictive nutrient factors to Eucalyptus grandis plantation in Sichuan

Restrictive nutrient factors of Eucalyptus grandis plantation in Sichuan were analyzed by correlative test.Results showed as follows:(1) Available P,exchangeable Ca, exchangeable Mg are most important restrictive factors of production,and synthetic effect of Fe,Cu and Zn cannot be neglected,but N,K,Mn in soil are least restricted due to enough providing.(2) Ca,Mg,P,Fe,B,N,Zn and Cu are important foliar nutrient concentration indexes as a sign of nutrient supply and absorption.(3) Nutrient balance relations ...