气候变化领域集成服务门户(CCPortal): Species-specific growth capacity for floodplain forest trees inferred from sapwood efficiency and individual tree competition

CCPortal

DOI	10.1016/j.foreco.2020.118427
	Species-specific growth capacity for floodplain forest trees inferred from sapwood efficiency and individual tree competition
	McAlhaney A.L.; Keim R.F.; Allen S.T.
发表日期	2020
ISSN	0378-1127
卷号	476
英文摘要	Although typically a strong determinant of site quality, the influence of flooding is not well understood for mixed-species floodplain forests. It is, however, generally assumed that growth is limited in floodplains that experience stagnant flooding because they are disconnected from river channels. Here, this assumption was tested across three connectivity levels (connected-to, partially-connected-to, and disconnected-from flowing water), using tree-ring sequences and field surveys of two dominant trees that cohabitate heavily flooded swamps but have contrasting life histories: short-lived black willow (Salix nigra) and long-lived baldcypress (Taxodium distichum). To characterize growing conditions for individual trees, we calculated sapwood efficiency (growth per sapwood area) and found that it declined in baldcypress from connected to disconnected sites; in contrast, black willow mean sapwood efficiency was lowest in the connected site. Overall, individual-tree sapwood efficiencies were highly variable, and local competition had a strong influence on baldcypress growth, independent of river-floodplain connectivity. Black willow appeared not to be sensitive to competition; however, it showed declining basal area trends that are likely attributable to age-related senescence. Black willow grows fast and indiscriminately, whereas baldcypress growth is sensitive to competition but persistent. Ring-width chronologies were used to identify species differences in growth responses to water levels; albeit similarly showing growth enhanced by flooding, baldcypress growth was consistently greatest with deep water (>3 m) whereas black willow growth was greatest with shallower water (1–2.5 m), especially in the less-connected sites. In addition to showing species-dependent growth responses to connectivity, these results show that tree growth is potentially more influenced by competition than by these degrees of connectivity, highlighting challenges in quantifying site-level growing conditions and flooding responses in disturbed, mixed stands. © 2020 Elsevier B.V.
英文关键词	Forested wetland; Growth efficiency; Hydrologic connectivity; Site quality; Subsidy-stress
语种	英语
scopus关键词	Banks (bodies of water); Efficiency; Floods; Plants (botany); Water levels; Wood products; Floodplain forest; Growing conditions; Growth capacity; Growth response; Individual tree; Shallower water; Species specifics; Taxodium distichum; Forestry; basal area; connectivity; deep water; flooding; floodplain forest; growth response; life history trait; river channel; tree ring; Competition; Efficiency; Floods; Forestry; Growth; Salix Nigra; Taxodium Distichum; Wood Products; Salix; Salix nigra; Taxodium distichum
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155003
作者单位	School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, United States
推荐引用方式 GB/T 7714	McAlhaney A.L.,Keim R.F.,Allen S.T.. Species-specific growth capacity for floodplain forest trees inferred from sapwood efficiency and individual tree competition[J],2020,476.
APA	McAlhaney A.L.,Keim R.F.,&Allen S.T..(2020).Species-specific growth capacity for floodplain forest trees inferred from sapwood efficiency and individual tree competition.Forest Ecology and Management,476.
MLA	McAlhaney A.L.,et al."Species-specific growth capacity for floodplain forest trees inferred from sapwood efficiency and individual tree competition".Forest Ecology and Management 476(2020).