干旱区生态环境知识资源中心(Arid): A sequence of multiyear wet and dry periods provides opportunities for grass recovery and state change reversals

Arid

DOI	10.1002/ecm.1590
	A sequence of multiyear wet and dry periods provides opportunities for grass recovery and state change reversals
	Peters, Debra P. C.; Savoy, Heather M.
通讯作者	Peters, DPC
来源期刊	ECOLOGICAL MONOGRAPHS
ISSN	0012-9615
EISSN	1557-7015
出版年	2023
卷号	93 期号:4
英文摘要	Multiyear periods (& GE;4 years) of extreme rainfall are increasing in frequency as climate continues to change, yet there is little understanding of how rainfall amount and heterogeneity in biophysical properties affect state changes in a sequence of wet and dry periods. Our objective was to examine the importance of rainfall periods, their legacies, and vegetation and soil properties to either the persistence of woody plants or a shift toward perennial grass dominance and a state reversal. We examined a 28-year record of rainfall consisting of a sequence of multiyear periods (average, dry, wet, dry, average) for four ecosystem types in the Jornada Basin. We analyzed relationships between above ground net primary production (ANPP) and rainfall for three plant functional groups that characterize alternative states (perennial grasses, other herbaceous plants, dominant shrubs). A multimodel comparison was used to determine the relative importance of rainfall, soil, and vegetation properties. For perennial grasses, the greatest mean ANPP in mesquite- and tarbush-dominated shrublands occurred in the wet period and in the dry period following the wet period in grasslands. Legacy effects in grasslands were asymmetric, where the lowest production was found in a dry period following an average period, and the greatest production occurred in a dry period following a wet period. For other herbaceous plants, in contrast, the greatest ANPP occurred in the wet period. Mesquite was the only dominant shrub species with a significant positive response in the wet period. Rainfall amount was a poor predictor of ANPP for each functional group when data from all periods were combined. Initial herbaceous biomass at the plant scale, patch-scale biomass, and soil texture at the landscape scale improved the predictive relationships of ANPP compared with rainfall alone. Under future climate, perennial grass production is expected to benefit the most from wet periods compared with other functional groups with continued high grass production in subsequent dry periods that can shift (desertified) shrublands toward grasslands. The continued dominance by shrubs will depend on the effects that rainfall has on perennial grasses and the sequence of high- and low-rainfall periods rather than the direct effects of rainfall on shrub production.
英文关键词	alternative states desertification drought grasslands multiscale processes primary production shrublands
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001072802400001
WOS关键词	SOUTHERN NEW-MEXICO ; DESERT GRASSLAND ; RAIN-USE ; DRYLAND ECOSYSTEMS ; WIND EROSION ; CLIMATE ; DROUGHT ; PRODUCTIVITY ; VEGETATION ; RESPONSES
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396006
推荐引用方式 GB/T 7714	Peters, Debra P. C.,Savoy, Heather M.. A sequence of multiyear wet and dry periods provides opportunities for grass recovery and state change reversals[J],2023,93(4).
APA	Peters, Debra P. C.,&Savoy, Heather M..(2023).A sequence of multiyear wet and dry periods provides opportunities for grass recovery and state change reversals.ECOLOGICAL MONOGRAPHS,93(4).
MLA	Peters, Debra P. C.,et al."A sequence of multiyear wet and dry periods provides opportunities for grass recovery and state change reversals".ECOLOGICAL MONOGRAPHS 93.4(2023).