Morphological Characteristics and Nutrient Content of Fine Roots of 2-Year-Old and 3-Year-Old Eucalyptus grandis Plantation

作     者：Xiaoyu DUAN Xianwei LI Liuling ZHOU Weishuang WANG Hui CHEN 

作者机构：College of ForestrySichuan Agricultural University (Ya'an Campus) College of Landscape ArchitectureSichuan Agricultural University (Chengdu Campus) 

出 版 物：《Agricultural Biotechnology》 (农业生物技术（英文版）)

年 卷 期：2012年第1卷第6期

页      面：9-14页

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：Supported by Key Project of the Education Department of Sichuan Province(09ZA079) College-level Fund of Sichuan Agricultural University(64070113) National Science and Technology Support Program of China(2011BAC09B05) Science and Technology Support Program of Sichuan Province(2010NZ0049) National Natural Science Foundation of China(30771717) Fund for Forest Tree Germplasm Resources in the Upper Reaches of the Yangtze River and Breeding Technology Innovation Team(00370503) 

主　　题：Eucalyptus grandis Fine root Root order Nutrient elements Morphological characteristics 

摘      要：[ Objective] This study aimed to explore the morphological characteristics and nutrient content of f＇me roots of 2-year-old and 3-year-old Euca/yptus grand/s plantation and investigate the correlation. [ Method] Fine roots of 2-year-old and 3-year-old Eucalyptus grandis plantation were collected as experimental materials, to determine the root diameter （D）, root length （L）, specific root length （SRL） and contents of major nutrient elements N, P, K, Ca, Mg and C of fine roots （level 1 -5）, study the morphological characteristics and major nutrient element content and investigate the correlation. [ Result] The results showed that morphological differences of fine roots （ level 1 - 5 ） of Eucalyptus grandis plantation were great with the increase of root order, to be specific, D and L increased and SRL decreased with the increasing root order; SRL, L and D of 3-year-old Eucalyptus grauclis plantation were greater than those of 2-year-old Euca/yptus grand/s plantation. Contents of N, Ca, Mg and C of fine roots of 2-year-old and 3-year-old Eucalyptus grandis plantation showed consistent orders with the increase of root order： N and Mg contents were reduced, while Ca and C contents were enhanced; P and K contents varied with different forest ages; both 2-year-old and 3-year- old Eucalyptus grandis showed an order of C 〉 K 〉 Ca （Mg） 〉 N. Major nutrient element content and morphological characteristics of Eucalyptus grand/s fine roots （level 1 -5 ） were extremely significantly correlated （P 〈0.01 ）, SRL, L and D could be adopted as reference indices to evaluate nutrient status of Eucalyptus grand/s. Required nutrients and fine root morphology of Eucalyptus grandis plantation changed with the increase of forest age, and the nutrient cycling and energy flow patterns also changed; major nutrient dements in fine roots of 2-year-old and 3-year-old Eucalyptus grandis plantation transferred in a different order from the growth order, therefore N fertilizer could be applied to impr