晋北不同人工林下苔藓优势种种间关系与生态位  

Interspecific associations and niches of dominant bryophytes under different planted forests in the North Shanxi province

作　　者：王建青 李素清[1] WANG Jianqing;LI Suqing(Institute of Loess Plateau, Shanxi University, 030006, Taiyuan, China)

机构地区：[1]山西大学黄土高原研究所,太原030006

出　　处：《中国水土保持科学》2022年第2期49-57,共9页Science of Soil and Water Conservation

基　　金：国家自然科学基金“黄土高原矿区退化生境土壤植被协同恢复模式及生态效应研究”(41271531);山西省第七批百人计划项目(207521013);山西省研究生教育教学改革项目(2020YJJG008)。

摘　　要：为筛选适宜生态恢复的优势苔藓植物种类,在苔藓植物样方调查的基础上,采用χ^(2)检验、Spearman秩相关分析、生态位宽度与重叠等方法,对晋北丘陵风沙区不同恢复年限的人工林下苔藓植物群落14个优势种种间关系与生态位进行分析。结果显示:1)晋北丘陵风沙区不同人工林下85.71%的苔藓优势种属于耐旱耐贫瘠的矮丛集型植物,优势种的种类与所在林型关系密切;2)14个苔藓优势种组成的91个种对中,χ^(2)检验和Spearman秩相关系数正负关联比均<1,大多数种对呈不显著联结;3)14个苔藓优势种可划分为3个生态种组,导致其生态种组划分的主要环境因子是土壤水分和光照条件;4)多数苔藓优势种种对间生态重叠值普遍较小,种间联结程度与生态位重叠呈线性相关;5)优势种丛生真藓(Bryum caespiticium)生态位宽度最大,在群落中广泛分布。因此:晋北丘陵风沙区不同人工林下苔藓优势种的相互依赖程度较低,种间联结松散,各物种趋于独立分布。在未来生态恢复中,丛生真藓可用于生态恢复的先锋种。[Background]The sandy-hilly region in North China has been affected by long-term water and wind erosion,resulting in serious desertification,thus it is urgent to restore the local vegetation.Bryophytes are the pioneer plants in the spontaneous succession and have strong soil-fixing ability,and they play an important role in soil conservation and combating desertification.Therefore,selecting the dominant bryophytes suitable for ecological restoration may promote the succession process of revegetation.Youyu county in the northern Shanxi province,an area suffered from heavily desertification,is a typical national-level demonstration area in China for combating desertification after over 70 years of revegetation efforts since early 1950s.[Methods]In September 2020,a total of 12 planted forests and 2 controls(a bare land and spontaneous grassland,respectively)with bryophyte growth were selected as sampling plots at Songtao Garden in Youyu county of Shanxi province.Bryophyte boxes were used for sampling,and related environmental factors were recorded,and the bryophyte species were identified by LEICA fluorescence microscope DM2500 and Nikon Stereo microscope SMZ745T.And then the interspecific associations and niches of 14 dominant bryophytes under different planted forests with different re-vegetated years on a sandy-hilly region in the North Shanxi were quantitatively analyzed by the methods ofχ^(2) test,Spearman rank correlation coefficient,niche width and overlap index.[Results]1)The life-form of 85.71%dominant bryophytes under different planted forests on a sandy-hilly region in the northern Shanxi belonged to the short turf with drought-barren resistance,and the species composition of dominant bryophytes was closely related to the type of planted forest.2)Among 91 species-pairs composed of 14 dominant bryophytes,the positive and negative correlation ratios ofχ^(2) test and Spearman rank correlation coefficient were all<1,and there were no significant association among most species-pairs.3)The 14 dominant bryophy

关 键 词：苔藓植物 优势种 种间关系 生态位 生态种组 

分 类 号：Q948.15[生物学—植物学]