2年生麻竹地上部营养元素的吸收积累与分配

摘要

Dendrocalamus latiflorus is one of the important dual-use clumping bamboo materials, the study of the absorption, accumulation and distribution of nutrients by standing bamboo organs can provide the basis for soil nutrient management in the D.latiflorus woodland.It is determined and analyzed the contents of nine nutrients in the leaves, branches and stalks of two-year-old Dendrocalamus latiflorus including N, P, K, Ca, Mg, Fe, Mn, Zn and Cu. The results showed that the contents of nutrient in different aerial part organs were ranked as leaves>branches>stalks except Zn of branches>leaves>stalks, the contents of nutrient were ranked as N>K>P>Ca>Mg>Mn>Fe>Zn>Cu in three organs.The total accumulated contents of nine nutrients were 249.13 kg/hm2 , of which, the con-tents in leaves, branches and stalks were 106.25 kg/hm2、82.01kg/hm2、60.87 kg/hm2 respectively.The accumula-ted content of N was ranked the top, reaching 61.0%of total contents.The allocation percentage of nine kinds of nu-trients in different organs was branches (37.0%)>leaf (35.9%)>stalk (27.1%).Therefore, more application of N fertilizer during the planting of Dendrocalamus latiflorus will promote the growth and benefit of bamboo land.%麻竹（ Dendrocalamus latiflorus）是优良的笋材两用丛生竹种，研究立竹器官营养元素的吸收、积累和分配，可为麻竹林的土壤养分管理提供参考。通过对麻竹2年生立竹叶、枝、秆的氮（ N）、磷（ P）、钾（ K）、钙（ Ca）、镁（ Mg）、铁（ Fe）、锰（ Mn）、锌（ Zn）和铜（ Cu）等9种营养元素含量进行测定分析，结果表明：试验麻竹林2年生立竹地上部分器官营养元素含量除Zn为枝＞叶＞秆外，其他8种营养元素含量均为叶＞枝＞秆，营养元素含量大小均为N＞K＞P＞Ca＞Mg＞Mn＞Fe＞Zn＞Cu。2年生立竹地上部分9种营养元素的积累量为249.13 kg／hm2，枝（106.25 kg／hm2）＞秆（82.01kg／hm2）＞叶（60.87 kg／hm2），其中以N素的积累量最大，所占比例达61.0％；9种营养元素含量在地上部分器官中的分配比例为枝（37.0％）＞叶（35.9％）＞秆（27.1％）。建议在麻竹林经营过程需适当增施氮肥，促进竹林生长和效益产出。