干旱区生态环境知识资源中心(Arid): Semi-arid savanna herbaceous production and diversity responses to interactive effects of drought, nitrogen deposition, and fire

Arid

DOI	10.1111/jvs.12848
	Semi-arid savanna herbaceous production and diversity responses to interactive effects of drought, nitrogen deposition, and fire
	Hannusch, Heather J.1; Rogers, William E.1; Lodge, Alexandra G.1; Starns, Heath D.2; Tolleson, Douglas R.2
通讯作者	Hannusch, Heather J.
来源期刊	JOURNAL OF VEGETATION SCIENCE
ISSN	1100-9233
EISSN	1654-1103
出版年	2020
卷号	31 期号:2 页码:255-265
英文摘要	Question Savannas are globally widespread and furnish a variety of ecological services through their structural heterogeneity. Unfortunately, those essential ecosystem services are threatened by climate changes including expected increases in duration of drought and nitrogen deposition. The objective of this study was to determine how overall herbaceous production, functional group production and diversity respond in the short-term to interactions between forecasted environmental conditions and prescribed fires. Location Western Edwards Plateau, Texas (latitude202f;31 degrees N, longitude 100 degrees W). Methods We randomly assigned full-factorial treatment combinations of rainout shelters, simulated nitrogen deposition and prescribed fires to field plots in an herbaceous-dominated area of a semi-arid savanna. Aboveground net primary productivity (assessed via destructive harvest) and diversity (using Shannon's index) were assessed as indicators of ecosystem functioning. Results Total aboveground net primary production was reduced by fire in the short-term (4 months), and reduced by drought at 8 months, but drought reductions were later overridden by lagged responses to large precipitation events (12 months). Forb production increased in response to nitrogen addition (8 months) and drought (12 months), but decreased as a result of fire (12 months). Live grass production was consistently reduced by drought. Plant species diversity was positively responsive to nitrogen addition, particularly in the absence of drought. Conclusions Our findings suggest that the concentrated precipitation events that are forecasted to follow extended droughts may aid rapid recovery of drought-induced production decreases. In addition, the small-scale diversity of this semi-arid savanna may be driven more by resource availability than light-competition in the short-term. Managers and ecologists can use these results to help disentangle the ecosystem functioning that may be observed in the presence of future droughts, nitrogen deposition and prescribed fire. Understanding these processes will be key to protecting the integrity of savannas.
英文关键词	anthropogenic change biodiversity biomass climate change dryland ecosystem erratic weather extreme events nutrient flux rangeland
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000514543800001
WOS关键词	REGIONAL-SCALE DROUGHT ; SUBTROPICAL SAVANNA ; ECOLOGICAL PROCESS ; VEGETATION CHANGE ; PRESCRIBED FIRE ; N AVAILABILITY ; CLIMATE-CHANGE ; GRASSLAND ; COMMUNITY ; INCREASES
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315105
作者单位	1.Texas A&M Univ, Ecosyst Sci & Management, College Stn, TX 77843 USA; 2.Texas A&M AgriLife Res, Sonora Res Stn, Sonora, TX USA
推荐引用方式 GB/T 7714	Hannusch, Heather J.,Rogers, William E.,Lodge, Alexandra G.,et al. Semi-arid savanna herbaceous production and diversity responses to interactive effects of drought, nitrogen deposition, and fire[J],2020,31(2):255-265.
APA	Hannusch, Heather J.,Rogers, William E.,Lodge, Alexandra G.,Starns, Heath D.,&Tolleson, Douglas R..(2020).Semi-arid savanna herbaceous production and diversity responses to interactive effects of drought, nitrogen deposition, and fire.JOURNAL OF VEGETATION SCIENCE,31(2),255-265.
MLA	Hannusch, Heather J.,et al."Semi-arid savanna herbaceous production and diversity responses to interactive effects of drought, nitrogen deposition, and fire".JOURNAL OF VEGETATION SCIENCE 31.2(2020):255-265.