金马河沿岸次生林苔藓植物群落对人为干扰的响应OA北大核心CSTPCD

We studied the characteristics of the community and distribution patterns of bryophytes under different levels of anthropogenic disturbances(mild interference,moderate interference,and severe interference)by analyzing their ecological niches,diversity indexes,life forms,and growing substrates to explore the effects of anthropogenic disturbances on bryophyte communities in secondary woodland along the Jinma River in Sichuan Province.In total,34 species from 15 families and 23 genera of bryophytes were documented,including 4 species of liverworts and 30 species of mosses.The dominant families were Brachytheciaceae and Thuidiaceae(a class of dankness bryophytes),with Haplocladium microphyllum exhibiting the highest importance value and ecological dominance.Its importance value,ecological niche width,and ecological dominance were 0.536 8,2.464 8,and 0.116 9,respectively.Haplocladium microphyllum occupied an important ecological niche,followed by Brachythecium formosanum.The proportion of life from turf bryophyte species increased from 30.43%to 40.91%with higher levels of anthropogenic disturbance,and their importance values were highest in the severe interference area.Turf bryophytes exhibited high drought tolerance and adaptability.The bryophyte species richness and Shannon-Wiener diversity indices of the severe interference area were significantly lower than those of the mild and moderate interference areas(P<0.05),and the Pielou evenness index of the moderately disturbed area was significantly higher than that of the other disturbed areas(P<0.05).In the severe interference area,the number of mosses attached to rotten(dead)trees was significantly lower than that in the mild interference area(P<0.05),and the number of mosses attached to tree trunks was significantly lower than that in the moderate interference area(P<0.05).Moss species were primarily attached to soil and rock,and the substrate favorable for bryophyte colonization gradually narrowed to a single type.The species richness and Shannon-Wiener diversity indices of the bryophyte community in the severe interference area significantly decreased in secondary woodlands(P<0.05).Therefore,excessive disturbance could result in the destruction of both the ecological environment and bryophyte community structure within the woodland.