千年桐不同冠层叶片养分含量及养分再吸收比较  

Comparison of Leaf Nutrient Content and Nutrient Resorption in Different Canopies of Aleurites montana

作　　者：洪希群 陈欣凡 张婵 张斌 陈灿[1] 范海兰[1] 林晗[1] HONG Xiqun;CHEN Xinfan;ZHANG Chan;ZHANG Bin;CHEN Can;FAN Hailan;LIN Han(College of Forestry,Fujian Agriculture and Forestry University/Fujian Key Laboratory for Forest Ecosystem Processes and Management,Fuzhou 350002,China;Forestry Bureau of Jianyang District,Nanping City in Fujian Province,Nanping 354200,China)

机构地区：[1]福建农林大学林学院/福建省高校森林生态系统过程与经营重点实验室,福建福州350002 [2]南平市建阳区林业局,福建南平354200

出　　处：《广东农业科学》2022年第6期58-65,共8页Guangdong Agricultural Sciences

基　　金：福建省科技计划项目(KTP21116A);福建省林业厅种业创新项目(KLb21009B);福建省水土保持试验站项目(KH190193A,KH220045A)。

摘　　要：【目的】分析千年桐不同冠层叶片养分含量和养分再吸收率的差异,研究千年桐叶片养分再吸收率与叶片养分含量、土壤养分含量的关系。【方法】以低产低效针叶林皆伐后营造的千年桐近自然经营生态林为试验对象,测定生长高峰期(7月)和衰老凋落期(10月)千年桐不同冠层叶片氮(N)、磷(P)、钾(K)、钙(Ca)、镁(Mg)含量。【结果】叶片主要养分N、P、K、Ca、Mg均表现为衰老叶养分含量显著低于成熟叶,衰老叶并未出现养分富集现象。成熟叶和衰老叶均呈现冠层上部叶片N含量显著大于冠层下部,成熟叶冠层上部K含量显著高于冠层下部。Ca再吸收率显著低于其他养分,仅有14.935(±3.191)%。除了Mg在冠层下部的再吸收率显著高于冠层上部,其他叶片养分再吸收率在上下冠层之间差异不大。千年桐K再吸收率与衰老前后叶片K含量均呈显著负相关,Ca再吸收率与成熟叶Ca含量呈显著正相关。叶片N再吸收率与土壤水解N呈显著正相关;叶片K再吸收率与土壤全K呈显著负相关,而与土壤速效K呈显著正相关。【结论】千年桐叶片主要养分均表现为衰老叶养分含量显著低于成熟叶,养分再吸收与叶片及土壤养分具有一定的关联。研究结果可为进一步探索生态公益林的养分循环机制提供科学依据。【Objective】The differences in leaf nutrient content and nutrient resorption efficiency of different canopies of A.montana forest were analyzed,and the relationship between A.montana leaf nutrient resorption efficiency and nutrient contents in leaves and soil was studied.【Method】The Aleurites montana forest,planted after the coniferous forests with low production being cut down and cultivated as ecological forest conforming to the nature,was taken as test materials.The contents of nitrogen(N),phosphorus(P),potassium(K),calcium(Ca)and magnesium(Mg)in leaves of the upper and lower canopies of A.montana were determined in the peak vegetative period(July)and the defoliating period(October).【Result】The macronutrients N,P,K,Ca and Mg in senescent leaves were significantly lower than those in mature leaves and there was no nutrient enrichment in senescent leaves.The N contents of mature and senescent leaves in the upper canopy were significantly higher than those in the lower canopy.The K content in mature leaves of upper layer was significantly higher than that in the lower canopy.Ca resorption efficiency was significantly lower than that of other nutrients,with only 14.935(±3.191)%.In addition,the resorption efficiency of Mg in the lower canopy was significantly higher than that in the upper canopy.There was no significant difference in the resorption efficiencies of other nutrients between upper and lower canopies.There was a significant negative correlation between K resorption efficiency and K content in mature and senescent leaves,and a significant positive correlation between Ca resorption efficiency and Ca content in mature leaves.There was a significant positive correlation between N resorption efficiency and soil hydrolyzed nitrogen.The K resorption efficiency was negatively correlated with soil total K content,but positively correlated with soil available K content.【Conclusion】The nutrient contents in senescent leaves of A.montana were significant lower than those in mature leaves,and there wa

关 键 词：千年桐 冠层 养分再吸收 凋落叶 养分循环 生态林 

分 类 号：S714.83[农业科学—林学]