退化红壤重建森林生态系统初期细根生物量及其动态变化研究  

Fine Root Biomass and the Growth Dynamicat Its Initial Reestablished Stage on Degraded Red Soil

作　　者：刘亮英[1] 刘苑秋[1] 杜天真[1] 罗良兴[2] 

机构地区：[1]江西农业大学园林与艺术学院,江西南昌330045 [2]泰和县林业局,江西泰和343700

出　　处：《江西林业科技》2007年第4期1-5,共5页Jiangxi Forestry Science and Technology

基　　金：国家自然科学基金(30371150);江西省自然科学基金资助项目(0230037)。

摘　　要：以江西泰和严重退化红壤地区重建的4种不同类型森林为对象,初步研究了细根生物量、分布特征、季节变化动态及其与土壤水分、温度的关系,结果表明:1)各重建模式的土壤细根现存生物量顺序为:针阔混交林>阔叶林>针叶林;2)细根垂直分布呈明显的层次性,主要分布在0～20cm土层内,占0～40cm土层内细根量的66.76%～80.64%;3)不同重建模式细根年生长动态呈单峰型,且季节变化较明显,在整个生长过程,针阔混交林的细根量大于阔叶纯林,针叶纯林细根量最少;4)土壤水分对细根生长变化的影响无明显规律;当土壤温度较低时,在0～20cm土层内随温度的升高而细根呈增加的趋势,20～40cm土层温度影响规律不明显。The biomass and the growth dynamic of fine root of different models reestablished on the seriously degraded red soil in Jiangxi province were studied in this paper and their relation with water and temperature of soil were analyzed. The research resuhs showed that： 1） The standing biomass of fine roots in different model was largest in the mixed forest of coniferous and broad-leaved forest, the pure broadleaved fores4 the pure coniferous forest the least ; 2） The distribution of fine roots was very superficial, mainly from 0 to 20cm below the surface, which accounts for above 66.76%-80.64% of total quantities of fine roots, and the biomass of soil fine roots decreases gradually along with the increase of soil depth; 3） The growth dynamic of fine root showed one apices for the different models rehabilitated and the seasonal dynamic represented some distinctness. In the whole growth process of fine root, the biomass of free roots of the mixed forest of coniferous and broad-leaved forest is larger than the pure broadleaved forest and the pure coniferous forest is the least; 4） In the study, it is not distinct that soil moisture influence fine root growth, when soil temperature is lower （〈30℃）, in the depth of 0-20cm, growth of fine root increases with the increase of soft temperature, the relation between soil temperature and free root growth is not distinct in the depth of 20-40cm.

关 键 词：退化红壤 细根生物量 土壤水分 土壤温度 

分 类 号：S154.4[农业科学—土壤学]