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韩大勇,杨永兴.若尔盖高原沙化沼泽区植物群落物种组成及其驱动因素.生态学报,2020,(16).http://dx.doi.org/10.5846/stxb201911082357  
若尔盖高原沙化沼泽区植物群落物种组成及其驱动因素
Species composition and associated driven factors of plant community in the desertified swamp area of Zoigê plateau
投稿时间:2019-11-08  修订日期:2020-04-27
DOI: " target="_blank" title="转向doi官网查询:http://dx.doi.org">10.5846/stxb201911082357
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摘要:
土壤沙化是若尔盖高原沼泽退化的重要过程之一,在此过程中,植物群落的变化及其成因机制是亟待解决的区域关键科学问题。本研究在若尔盖高原沙化沼泽区,依据土壤沙化梯度设置6个研究样地,分别为:分布于季节性小河河床的华扁穗草群落(样地1),高河漫滩的高山嵩草群落(样地2),固定沙丘的四川嵩草群落(样地3、4),半固定沙丘的黑褐穗苔草群落(样地5)和半流动沙丘的粗壮嵩草群落(样地6),研究了植物群落物种组成及其与土壤湿度、容重和孔隙度的关系。结果表明: 6个样地总计出现63种维管植物,隶属26科47属。随着土壤沙化程度增加,植物种数(单位样方物种丰富度和总种数)和地上生物量均表现为单峰变化格局,但植物种数峰值出现在高山嵩草群落,地上生物量峰值出现在四川嵩草群落。β多样性最高值出现在华扁穗草群落,最低值出现在四川嵩草群落。土壤湿度对植物种多度影响最大,可解释总方差的24.8%,其次为土壤容重,可解释1.4%。认为沙化过程中土壤湿度是影响植物群落生态分布和种类构成的关键因素之一,尤其影响群落特征种的多度和分布。从沙地植被恢复的角度,粗壮嵩草可考虑作为沙地恢复的先锋物种。
Abstract:
Soil desertification is a representative process of swamp degradation in the Zoigê plateau. During the process, the vegetation shift and associated mechanism becomes the pressingly key scientific issue on Zoigê region. In the present study, 6 plots were set along soil desertification gradients in the desertified swamp area of Zoigê plateau, including: Blysmus sinocompressus community distributed in seasonal river bed (Plot 1), Kobresia pygmaea community distributed in floodplain (Plot 2), K. setchwanensis community distributed in fixed tune (Plot 3, 4), Carex atrofusca subsp. Minor community distributed in semi-fixed dune (Plot 5) and Kobresia robusta community distributed in semi-mobile dune (Plot 6). The relationship between plant community and soil physical properties, i.e. soil moisture, volume weight and porosity, were studied. The results indicated that there were 63 vascular species across 6 plots, belonging to 26 families and 47 genuses. As the increasing of the degree of soil desertification, both the number of plant species (represented by species richness per quadrate and total number of species) and above-ground biomass showed unimodal patterns. The highest number of plant species occurred in K. pygmaea community, whereas the highest values of above-ground biomass occurred in K. setchwanensis community. The β diversity was highest in Blysmus sino-compressus community, whereas lowest in Kobresia setchwanensis community. Soil moisture was most closely correlated with the variation of plant abundance and explained 24.8% of total variance, followed by soil volume weight and explained 1.4%. Soil moisture was considered a key factor in regulating the ecological distribution and species assemblage of plant community during the process of desertification, especially for the abundance and distribution of characteristic species. In the case of vegetation restoration in sandy soil, K. robusta was considered a pioneer species.

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