Tree Cover Improved the Species Diversity of Understory Spontaneous Herbs in a Small City
Tree Cover Improved the Species Diversity of Understory Spontaneous Herbs in a Small City
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树木覆盖提高了小城市林下自生草本植物的物种多样性
DOI：
10.3390/f13081310
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发表时间：
2022-08
期刊：
影响因子：
2.9
通讯作者：
Jiaxing Wei
中科院分区：
文献类型：
--
作者：
Yimin Ren;Min Guo;Fangyuan Yin;Ming-Juan Zhang;Jiaxing Wei
为了改善城市环境，人们在建成区种植了大量的树木，但树木覆盖对自发的林下草本植物的影响尚不清楚。本研究调查了四川省小城市中国建成区两种生境(有树覆盖和不有树覆盖的生境)中的自生草本植物。共记录到自然草本植物2 2 2种，隶属于71科180属，其中1种为易危种，6种为中国特有种。尽管两种生境的总体物种丰富度值基本相同，但在有植被覆盖的生境中，所有植物、多年生植物、矮生型植物和动物散布植物的平均每样地物种丰富度显著高于无植被植被生境。在有乔木覆盖的生境(VR=1.51，p<；0.05)和无树木覆盖的生境中，神经型(VR=0.86)的总体物种关联度显著正相关。在每种生境中记录频率最高的25种植物中，同一性状组合类型的植物在两种生境中的物种关联度差异较大。在种间关联度方面，在有乔木覆盖的生境中只有13.33%的种对具有显著的关联性，而在无乔木覆盖的生境中有22.22%的种对具有显著的负关联性。对于具有高大生长型的植物之间的物种关联度，有乔木覆盖的生境中显著正关联的比例大约是没有乔木覆盖的生境的两倍。对于矮生型植物之间的物种联结，无乔木覆盖生境的负联结比例约为有乔木覆盖生境的两倍。具有相同扩散方式的物种在不利于其建立的生境中，负的种间联结比例一般很低，而正的种间联结的比例很高。我们的发现表明，树木覆盖可以提高其下方自发草本植物的物种丰富度，并深刻影响建成区的种间共存关系。
A large number of trees have been planted in built-up areas to improve the urban environment, but the effects of tree cover on spontaneous understory herbs are not yet well understood. This study surveyed spontaneous herbs in two kinds of habitats (habitats with and without tree cover) in the built-up area of the small city Junlian in Sichuan Province, China. A total of 222 species of spontaneous herbaceous plants in 180 genera of 71 families were recorded, including a vulnerable species and six species endemic to China. Although the overall species richness values were similar in the two kinds of habitat, the average species richness per quadrat of all plants, perennials, plants with the dwarf growth form, and animal-dispersed plants was significantly higher in the habitats with tree cover than in those without tree cover. The overall species association was significantly positive in the habitats with tree cover (VR = 1.51, p < 0.05) and neural (VR = 0.86) in the habitats without tree cover. Among the top 25 frequently recorded species in each kind of habitat, the species association of plants with the same trait combination type differed greatly in the two kinds of habitats. For the species association between annuals, only 13.33% of species pairs were significantly associated in the habitats with tree cover, while 22.22% of the species pairs were significantly negatively associated in the habitats without tree cover. For the species association between plants with tall growth forms, the proportion of significant positive associations in the habitats with tree cover was approximately twice than in the habitats without tree cover. For the species association between plants with the dwarf growth form, the proportion of negative associations in the habitats without tree cover was approximately twice that in the habitats with tree cover. Species with the same dispersal mode generally had a very low proportion of negative interspecific associations or a high proportion of positive interspecific associations in habitats unfavorable to their establishment. Our findings suggest that tree cover can improve the species richness of the spontaneous herbaceous species beneath them and profoundly influence interspecific coexistence relationships in a built-up area.
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