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Weed communities and its dynamics in forest plantations of Sugi(Cryptomeria japonica) and Hinoki(Chamaecyparis obtusa)

杉、扁柏人工林杂草群落及其动态

基本信息

批准号：
61560157
负责人：
SAKURA Tsuguo
金额：
$ 1.28万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1988
项目状态：
已结题

项目摘要

The study was conducted in the forest of Tokyo university in the southern part of the Boso peninsula, to study the weed community and its dynamics in forest plantations of Sugi(Cryptomeria japonica) and Hinoki(Chamaecyparis obtusa). Species composition,structure,etc.of weed community changing with time were investigated mainly in sugi plantations. At the same time, growth status of planted trees,and forest structure were examined.Weed community in the 79-yr-old Sugi forest stand locating in the warm-temperate zone was composed mainly of evergreen broad-leaf trees and evergreen perennial herbs. The Number of plant species in the 1st-3rd-yr old young stands after clear-cutting has increased remarkably in comparison with stands before clear-cutting. The young stand vegetation after clear-cutting has become abundant in diversity of species. Erechitites hieracifolia which is the annual plant was the dominant species in the 1st-yr old stand after clear-cutting.Miscanthus sinensis of tall grass type was the most dominant species through out from 2 years to 7 years. The coverage(%) and weight(g) of Miscanthus sinensis which is the most major plants for mowing have increased annually by the mowing of 1 time in a year , in the summer seasons.The lightness in forest at 16-25 yr-old young stands of canopy closing was very dark. The relative light intensity at the 1m above the ground was from 0.03 up to 3 % . The Number of plant species on the ground was only a few, and total amount of C xH per species was only a little. Few species of plant belong to vine,Lilaceae, Pteridophyta,Orchidaceae,etc. have existed mainly in understory in closed forest.

本研究在日本博索半岛南部的东京大学森林中进行，旨在研究日本柳杉(Cryptomeria Japan Onica)和山木(Chamaecyparis Obtusa)人工林中的杂草群落及其动态。主要调查了杉木人工林杂草群落的种类组成、结构等随时间的变化。暖温带79年生杉木林杂草群落主要由常绿阔叶树和常绿多年生草本植物组成。与采伐前相比，采伐后1~3年生幼林的植物种数显著增加。采伐后的幼林植被物种多样性丰富。采伐后的1年生林分优势种为一年生草本植物，高草型芒草是2年生至7年生林分的优势种。芒草是夏季最主要的修剪植物，每年修剪1次，其盖度(%)和重量(G)均呈逐年增加的趋势，16~25年生封育幼林的林内光线很暗。离地1m处的相对光强为0.03~3%。地上植物种类很少，每种植物的CXH总量也很少。很少有藤本植物、丁香科、蕨类、兰科等植物主要存在于封山育林的林下。