Spatial heterogeneity of plant community composition and diversity on phytogenic mounds caused by water erosion

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-11-01 DOI:10.1080/17550874.2021.1897700

Hua-Dong Du, Benyan Ning, Ju-ying Jiao, Yichen Cao

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引用次数: 1

Abstract

ABSTRACT Background A phytogenic mound is a special microtopography that forms under a perennial plant canopy in erosion-affected areas. These mounds result in spatial microenvironmental heterogeneity and thus are important factors in determining plant community composition. Aims We assessed whether and how plant composition and diversity differed on different parts of mounds in water erosion-affected areas and evaluated which environmental variables were related to the compositional difference. Methods We compared plant community composition and diversity on the upslope (UP) and downslope (DN) parts of mounds and inter-canopy surfaces (IS) along four slope gradients. Results On slopes < 46.6%, vegetation cover, biomass, density and diversity of plant communities did not significantly differ between UP and DN. However, these plant community attributes were higher UP than in IS and DN on steeper slopes (> 46.6%). On such slopes phanerophytes and chamaephytes occurred only UP. Sediment accumulation, light intensity, soil moisture, and surface hardness were significantly correlated with the community composition on mounds, while soil N, P and K showed a weak relationship. Conclusion Only the UP of mounds on steep slopes maintained high plant diversity in water erosion-affected areas, which is especially important for shaping plant community patterns on seriously eroded slopes where plant colonisation is limited.

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水蚀作用下植物群落组成和多样性的空间异质性

摘要背景植物成因丘是一种特殊的微地貌，形成于受侵蚀地区的多年生植物冠层下。这些土丘导致了空间微环境的异质性，因此是决定植物群落组成的重要因素。目的我们评估了受水蚀影响地区土丘不同部位的植物组成和多样性是否以及如何存在差异，并评估了哪些环境变量与组成差异有关。方法沿四个坡度比较土丘和冠层间表面上坡（UP）和下坡（DN）部分的植物群落组成和多样性。结果在坡度<46.6%时，UP和DN的植被覆盖率、生物量、密度和植物群落多样性差异不显著。然而，在较陡的斜坡上，这些植物群落属性的UP高于IS和DN（>46.6%）。沉积物积累、光照强度、土壤水分和表面硬度与土丘上的群落组成显著相关，而土壤N、P和K的关系较弱。结论在水蚀影响区，只有陡坡土丘的UP保持了较高的植物多样性，这对于在植物定植有限的严重侵蚀斜坡上形成植物群落模式尤为重要。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.