围栏措施对青藏高原高寒草甸群落结构和稳定性的影响

发布时间：2018-06-17 13:57

本文选题：高寒草甸 + 功能群　；参考：《草业科学》2017年03期

【摘要】：人工条件下高寒脆弱生态系统群落结构及其稳定性的变化是研究其生态功能的重要内容。本研究以乌玛塘高寒草甸示范区为例,对研究区植被进行植物群落学调查,对植物群落功能群和稳定性进行分析,研究了高寒草甸植物群落在围栏4年和8年后,围栏内外群落的结构变化和稳定性差异。结果表明,1)围栏内物种多样性大于围栏外;围栏4年后群落内一年生、二年生植物重要值明显高于围栏外;围栏8年后,群落优势种发生变化,高山嵩草(Kobresia pygmaea)优势度降低,一年生、二年生植物甘肃马先蒿(Pedicularis kansuensis)成为优势物种之一;多年生禾草,杂类草以及一年生、二年生植物3个功能群所含物种数显著多于围栏外(P0.05);2)围栏4年后群落稳定性表现为围栏内围栏外,8年后表现为围栏内围栏外。短期围栏使得群落稳定性高于未围栏的群落,但是群落结构差异并不明显,随着围栏时间增加,群落结构发生明显变化,且群落稳定性降低,围栏外群落则趋向于稳定。
[Abstract]:The change of community structure and stability of alpine fragile ecosystem under artificial conditions is an important content in the study of its ecological function. In this study, taking the demonstration area of Wumatang alpine meadow as an example, the vegetation in the study area was investigated, the functional groups and stability of plant communities were analyzed, and the plant communities of alpine meadow were studied after 4 and 8 years of fencing. The structural changes and stability of the community inside and outside the enclosure are different. The results showed that (1) species diversity in the enclosure was higher than that outside the fence, and after 4 years, the important value of biannual plants in the community was significantly higher than that outside the fence, and after 8 years, the dominant species of the community changed, and the dominance of Kobresia pygmaea decreased. Annual, biennial plant Pedicularis kansuensis) is one of the dominant species; perennial grasses, miscellaneous grasses and annual grasses, The number of species in the 3 functional groups of biannual plants was significantly higher than that in the outside fence (P0.05P0. 05) after 4 years, the stability of the community was shown as the inside and outside of the fence, and after 8 years, the stability of the community was outside the fence. The community stability was higher than that of the unfenced community in the short term, but the difference of the community structure was not obvious. With the increase of the fencing time, the community structure changed obviously, and the community stability decreased, while the community outside the fence tended to be stable.
【作者单位】：北京林业大学林学院;北京林业大学水土保持国家林业局重点实验室;滨州学院山东省黄河三角洲生态环境重点实验室;
【基金】：国家林业局公益性行业科技专项(201504401) 国家自然科学基金(30870231)
【分类号】：S812

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