长白落叶松人工林细根生物量及其动态研究  

Fine roots biomass and its dynamics of Larix olgensis plantation

作　　者：郑金萍[1] 范春楠[1] 郭忠玲[1] 杨保国[1] 岳龙[1] 刘士玲[1] 

机构地区：[1]北华大学林学院,吉林吉林132013

出　　处：《南京林业大学学报（自然科学版）》2014年第2期175-179,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：中国科学院战略性先导科技专项项目(XDA05050201)

摘　　要：以长白山区30年生长白落叶松（ Larix olgensis）人工林为研究对象，通过根钻连续取样及分解袋埋藏法，对细根（≤2 mm）生物量及季节动态、细根分解、细根周转进行了研究。结果表明：在长白落叶松人工林生长季，细根平均生物量为3．8257 t/hm2，其中活细根和死细根分别占84．51％和15.49％；0～10 cm土层活、死细根生物量分别占林地活、死细根总量的72．09％和50.46％；细根生物量随土层深度的增加而减少。长白落叶松人工林细根生物量在1年中有明显的季节变化规律，活细根的呈双峰型，死细根的呈多峰型。经细根分解实验计算，长白落叶松人工林细根分解系数k平均为0．0015，细根年生长量、年分解量和年周转率分别为1．5348 t/hm2、0．1450 t/hm2和0．47次/a。This article had studied the biomass, seasonal dynamics, the vertical distribution, decomposition and turnover of the fine roots in Larix olgensis plantation of Changbai mountain from May 2006 to 2007 by using the sequen-tial soil coring method and litter bag technique. The results showed that the average biomass of fine roots was 3. 825 7 t/hm2 with 84.51% living fine roots and 15.49% dead fine roots. The fine roots mainly distributed in the 0-10 cm of soil layer with 72.09% living fine roots and 50.46% dead fine roots. And with soil layer deepen,the fine roots biomass de-creased. The annual change of living and dead fine roots biomass in Larix olgensis plantation had obviously seasonal vari-ation. The living fine roots biomass in different season varied with a double peak curve, and the peaks of the curve ap-pear in May and August. The seasonal change of the dead fine roots biomass showed a multiple peak curve. The average decomposition efficiency （ k） was 0.001 5 for Larix olgensis plantation. Net primary productivity, decomposition and an-nual turnover of fine roots in Larix olgensis plantation were 1.534 8 t/hm2 , 0.145 0 t/hm2 and 0.47 times per year, re-spectively.

关 键 词：长白落叶松人工林 细根生物量 细根分解 细根周转 

分 类 号：S718[农业科学—林学]