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Drought impact on forest regeneration in the Southeast USA
Hu, Huifeng; Wang, G. Geoff; Bauerle, William L.; Klos, Ryan J.
2017
发表期刊ECOSPHERE
ISSN2150-8925
卷号8期号:4
摘要Elevating concentrations of atmospheric greenhouse gases are now widely acknowledged as a major cause of global warming. A warmer climate could increase the frequency, duration, and/or severity of drought and, in turn, could alter the composition, structure, and biogeography of forests in many regions. To explore the regional effects of different drought severities on forest regeneration, we investigated changes in sapling growth and density across the southeastern United States under various drought and stand conditions using 1991-2005 Forest Health and Monitoring plot data from Alabama, Georgia, and Virginia. Drought effects were examined on three species groups (pine, oak + hickory, and mesophytic species) using the Palmer Drought Severity Index. Stand and site variables, including total basal area, total stand density, tree species richness, slope, and stand age, were used to account for drought effects under varying stand conditions. The oak + hickory and mesophytic species groups exhibited significant reductions in annual growth rate with increasing drought severity. However, no significant difference in annual growth rate was observed within the pine species group. Chi-square analysis showed that annual mortality rate was significantly dependent on drought severity for each species group but annual recruitment rate was only significantly dependent on drought severity for the oak + hickory group. Total basal area, tree species richness, and stand age had a negative effect on growth in one or more species groups. The observed differential dynamics of sapling growth, mortality, and recruitment among species groups may alter the trend of forest regeneration in southeastern U.S. forests because of the predicted increases in intensity and frequency of droughts in the future. The significant effects of stand conditions on drought responses observed in our study also suggest that appropriate forest management strategies may be useful to maintain structure features of understory saplings for southeastern U.S. forests.
关键词drought Forest Health and Monitoring Forest Inventory and Analysis growth mortality Palmer Drought Severity Index (PDSI) recruitment sapling
学科领域Plant Sciences
DOI10.11646/phytotaxa.329.2.14
收录类别SCI
语种英语
WOS关键词FAGUS-SYLVATICA L. ; TREE MORTALITY ; CLIMATE-CHANGE ; SCOTS PINE ; GROWTH ; RESPONSES ; SEEDLINGS ; TOLERANCE ; STAND ; LEAF
WOS记录号WOS:000416928900014
出版者WILEY
文献子类Article
出版地HOBOKEN
资助机构National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31470498] ; Chinese National Basic Research ProgramNational Basic Research Program of China [2014CB954303, 2015CB954201] ; United States Department of Agriculture (USDA) Forest Service under the Forest Health Monitoring Analysis and Reporting program
作者邮箱gwang@clemson.edu
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ibcas.ac.cn/handle/2S10CLM1/22330
专题植被与环境变化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
2.Hu, Huifeng; Wang, G. Geoff; Klos, Ryan J.] Clemson Univ, Dept Forestry & Environm Conservat, Clemson, SC 29634 USA
3.Bauerle, William L.] Colorado State Univ, Dept Hort & Landscape Architecture, Ft Collins, CO 80523 USA
推荐引用方式
GB/T 7714
Hu, Huifeng,Wang, G. Geoff,Bauerle, William L.,et al. Drought impact on forest regeneration in the Southeast USA[J]. ECOSPHERE,2017,8(4).
APA Hu, Huifeng,Wang, G. Geoff,Bauerle, William L.,&Klos, Ryan J..(2017).Drought impact on forest regeneration in the Southeast USA.ECOSPHERE,8(4).
MLA Hu, Huifeng,et al."Drought impact on forest regeneration in the Southeast USA".ECOSPHERE 8.4(2017).
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