干旱区生态环境知识资源中心(Arid): The role of chronic anthropogenic disturbances in plant community assembly along a water availability gradient in Brazil?s semiarid Caatinga region

Arid

DOI	10.1016/j.foreco.2023.120980
	The role of chronic anthropogenic disturbances in plant community assembly along a water availability gradient in Brazil?s semiarid Caatinga region
	Ramos, Maiara Bezerra; Rodrigues Maciel, Maria Gracielle; da Cunha, Sonaly Silva; de Souza, Stefanny Martins; Pedrosa, Kamila Marques; Lelis Leal de Souza, Jose Joao; Gonzalez, Edgar J.; Meave, Jorge A.; Lopes, Sergio de Faria
通讯作者	Lopes, SD
来源期刊	FOREST ECOLOGY AND MANAGEMENT
ISSN	0378-1127
EISSN	1872-7042
出版年	2023
卷号	538
英文摘要	The effects of anthropogenic disturbances on the structure and function of seasonally dry tropical forests (SDTFs) are mediated both by disturbance type and intensity, and the environmental conditions, including climate. In a climate change scenario, the interaction between low water availability and chronic anthropogenic disturbances may potentially have drastic consequences on SDTF dynamics and the ecosystem services it provides. We hy-pothesized that in these naturally stressed systems, the effects of human disturbance are strongest in the most water-stressed sites, implying a worrisome synergism between harsh abiotic conditions (lower precipitation, higher temperature) and human effects, ultimately resulting in a less developed community structure and reduced diversity. By integrating information for the adult and regenerating vegetation strata in 21 sites distributed across climatic, plant cover and disturbance gradients in the Caatinga (seasonally dry tropical) forest of Brazil, we analyzed the individual and combined effects of chronic anthropogenic disturbances, as measured through the Cattle Pressure Index and the Human Activity Index, along climate gradients, on community structure, diversity, and composition. As expected, the Cattle Pressure Index was negatively related to diameter at ground level, basal area, and diversity in the adult stratum, whereas for the regenerating stratum, litter stock had the strongest effect on vegetation structure. Climatic factors were poor predictors of the variation in the three true diversity measures (0D, 1D, and 2D) of the regenerating community. Our results revealed important cross-site differences in both vegetation strata over a small range of climatic variation. We conclude that the most stressful conditions associated with a very low precipitation regime enhance the effects on chronic disturbances, gradually driving SDTF communities into new alternative states and rendering these environments more prone to desertification.
英文关键词	Adult community Cattle Pressure Index Human Activity Index Rainfall gradient Regenerating community Seasonally dry tropical forest
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000981810400001
WOS关键词	TROPICAL DRY FORESTS ; LAND-USE ; FUNCTIONAL DIVERSITY ; VEGETATION STRUCTURE ; SPECIES-DIVERSITY ; TREE MORTALITY ; REGENERATION ; ECOSYSTEMS ; SELECTION ; IMPOVERISHMENT
WOS类目	Forestry
WOS研究方向	Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396386
推荐引用方式 GB/T 7714	Ramos, Maiara Bezerra,Rodrigues Maciel, Maria Gracielle,da Cunha, Sonaly Silva,et al. The role of chronic anthropogenic disturbances in plant community assembly along a water availability gradient in Brazil?s semiarid Caatinga region[J],2023,538.
APA	Ramos, Maiara Bezerra.,Rodrigues Maciel, Maria Gracielle.,da Cunha, Sonaly Silva.,de Souza, Stefanny Martins.,Pedrosa, Kamila Marques.,...&Lopes, Sergio de Faria.(2023).The role of chronic anthropogenic disturbances in plant community assembly along a water availability gradient in Brazil?s semiarid Caatinga region.FOREST ECOLOGY AND MANAGEMENT,538.
MLA	Ramos, Maiara Bezerra,et al."The role of chronic anthropogenic disturbances in plant community assembly along a water availability gradient in Brazil?s semiarid Caatinga region".FOREST ECOLOGY AND MANAGEMENT 538(2023).