摘要
采用空间序列代替时间序列的方法进行植被调查基础上,对不同恢复年限退耕地的植被演替规律和物种多样性动态进行分析。结果表明:(1)退耕后50 a的植物群落演替过程中,调查样方内共出现草本植物58种,分属于20科45属。其中,菊科、豆科、禾本科共计23属35种,占属、种总数的51.1%和60.3%,说明这3科植物在陕北黄土峁状丘陵沟壑区植被演替过程中占据主要地位。(2)物种构成表现为多数种属于少数科,且少数种属于多数科的特征。且群落演替由藜科杂草开始,依次为1年生草本群落→多年生根茎草本群落→多年生丛生草本群落,呈现向地带性物种和灌丛群落演替的趋势。(3)退耕36 a后,植被演替由多年生地带性丛生草本群落逐渐向耐旱耐瘠薄的灌丛群落演变,在无人为破坏的情况下,植被将朝着适宜当地气候、环境条件的方向演替,最终形成与当地气候相协调的稳定阶段。
A two year experiment was carried out in Yulin to better understand dynamics of species diversity and vegetation succession of abandoned land in loess hilly region. Based on spatial sequence instead of temporal sequence method, analysis of vegetation succession law and species diversity dynamics with different restoration time and the research of 44 sample plots, the result showed that： （1） Plant community succession after 50 years of farming, a total of 58 kinds of herbs appeared in the survey sample plots, belonging to 20 families and 45 generas. Compositae, Leguminosae, Gramineae accounted for 51.1 percent and 60.3 percent of the total, which showed that these three families occupied a major position in the process of vegetation succession in the loess hills and gully region. （2） Species constitute presented as most species belonging to a small number of families, and a small number of species belonging to most families, the succession started with the dominant species, weeds of Chenopodiaceae, followed by annual herbaceous community, perennial rhizome herb community, herbaceous perennial community, till perennial rosette herb community, in which the succession had a trend of zonal vegetation and shrub stages. （3） In the later period of returning farmland to forests, vegetation succession gradually changed from perennial herb community to barren drought-resistant shrub. In the absence of human destruction, the succession would be moving to the direction that the climate and environment is very suitable for vegetation growth, eventually vegetation adapt to the local climate and get to the stable stage.
出处
《西北林学院学报》
CSCD
北大核心
2009年第5期10-15,共6页
Journal of Northwest Forestry University
基金
国家自然科学基金"黄土丘陵沟壑区植被演替与水土流失相互作用机理"(30671721)
西北农林科技大学"青年学术骨干支持计划"
关键词
黄土丘陵沟壑区
退耕地
植被演替
物种多样性
the loess hilly and gully region
abandoned land
vegetation succession
species diversity
