干旱区生态环境知识资源中心(Arid): Topography, grazing, and soil textures control over rangelands' vegetation quantity and quality

Arid

DOI	10.1016/j.scitotenv.2019.134153
	Topography, grazing, and soil textures control over rangelands' vegetation quantity and quality
	Sanaei, Anvar 1,2; Li, Mingshi 1; Ali, Arshad 1
通讯作者	Ali, Arshad
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	697
英文摘要	Topography, grazing disturbances, and soil textures are the main determining factors of natural herbaceous plant communities. Yet, while interesting efforts have been made to link topography, soil conditions, grazing disturbances, species diversity and aboveground biomass, we still lack a comprehensive understanding of how soil textural properties and grazing disturbances co-vary along topographic gradients, and how they jointly shape vegetation quantity and quality in natural rangelands. In this study, we used abiotic and biotic datasets from 735 quadrats of natural rangelands located in the southern Alborz Province of Iran. We quantified topographic variables (i.e. elevation, slope, and aspect), grazing disturbance intensities, soil textural properties (i.e. gravel, sand, silt, and clay contents) as predictor (v)ariables. Vegetation quantity (i.e. aboveground biomass, vegetation coverage, and vegetation density) and quality (i.e. species richness, Shannon's diversity, and species evenness) variables were used as response variables. We used boosted regression trees (BRT) models for assessing the relative contribution and effects of multiple predictors on each response variable. We found that vegetation quantity and quality were jointly explained by topography, grazing disturbances, and soil textural properties. Vegetation quantity increased gradually or showed a hump-backed type pattern whereas vegetation quality decreased with elevation. Intensive grazing decreased vegetation quantity of shrubs and graminoids, which in turn determined the vegetation quantity of whole-community (i.e. all species). Higher vegetation quantity of shrubs was located on sandy soils while high vegetation quality was located on silty soils, whereas forbs and graminoids showed an opposite trend. Although the drivers of rangelands' vegetation quantity and quality are not mutually exclusive, the magnitude, shape and complexity of these relationships are highly dependent on plant growth forms. This study suggests that high grazing at lower elevation should be managed properly in order to conserve graminoids and to enhance their functioning in line with forbs and shrubs species. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Aboveground biomass Biodiversity Environmental factors Plant growth forms Vegetation structure
类型	Article
语种	英语
国家	Peoples R China ; Iran
收录类别	SCI-E
WOS记录号	WOS:000499668600095
WOS关键词	PLANT-SPECIES RICHNESS ; ENVIRONMENTAL HETEROGENEITY ; ABOVEGROUND BIOMASS ; ECOSYSTEM STRUCTURE ; BIOTIC DRIVERS ; DESERT STEPPE ; DIVERSITY ; GRASSLAND ; PRODUCTIVITY ; SCALE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-12-20
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311888
作者单位	1.Nanjing Forestry Univ, Coll Forestry, Dept Forest Resources Management, Nanjing 210037, Jiangsu, Peoples R China; 2.Univ Tehran, Nat Resources Fac, Dept Reclamat Arid & Mt Reg, POB 31585-4314, Karaj, Iran
推荐引用方式 GB/T 7714	Sanaei, Anvar,Li, Mingshi,Ali, Arshad. Topography, grazing, and soil textures control over rangelands' vegetation quantity and quality[J],2019,697.
APA	Sanaei, Anvar,Li, Mingshi,&Ali, Arshad.(2019).Topography, grazing, and soil textures control over rangelands' vegetation quantity and quality.SCIENCE OF THE TOTAL ENVIRONMENT,697.
MLA	Sanaei, Anvar,et al."Topography, grazing, and soil textures control over rangelands' vegetation quantity and quality".SCIENCE OF THE TOTAL ENVIRONMENT 697(2019).