气候变化领域集成服务门户(CCPortal): Small gradients in salinity have large effects on stand water use in freshwater wetland forests

CCPortal

DOI	10.1016/j.foreco.2020.118308
	Small gradients in salinity have large effects on stand water use in freshwater wetland forests
	Duberstein J.A.; Krauss K.W.; Baldwin M.J.; Allen S.T.; Conner W.H.; Salter J.S.; Jr.; Miloshis M.
发表日期	2020
ISSN	0378-1127
卷号	473
英文摘要	Salinity intrusion is responsible for changes to freshwater wetland watersheds globally, but little is known about how wetland water budgets might be influenced by small increments in salinity. We studied a forested wetland in South Carolina, USA, and installed sap flow probes on 72 trees/shrubs along a salinity gradient. Species investigated included the trees baldcypress (Taxodium distichum [L.] Rich.), water tupelo (Nyssa aquatica L.), swamp tupelo (Nyssa biflora Walt.), and the shrub waxmyrtle (Morella cerifera (L.) Small). This study improves upon past reliance on greenhouse seedling studies by adding measurements of trees/shrubs along a salinity gradient, and better describes the role of low salinity on water use in freshwater wetland forests. We measured patterns of water use related to salinity, atmospheric conditions and season, and hypothesized that salinity would influence wetland forest water use through two mechanisms: salinity disturbances would yield stands with species and size classes that transpire less and individual trees with less conductive xylem tissue (i.e., sapwood). Both hypotheses held. At salinity concentrations ranging from fresh to 3 psu, forest structural changes alone resulted in stand water use reductions from 494 mm year-1 in freshwater stands to 316 mm year-1 in stands of slightly higher salinity. Tree sapwood function (inferred from radial sap flux profiles) also changed along this gradient and reduced sap flow rates by an additional 13.3% per unit increase in salinity (psu). Thus, stand water use was further reduced to 190 mm year-1 on saline sites. We found that forest structure is not the only change that affects water use in salinized watersheds; individual tree eco-physiological responses to salinity, manifesting in different radial sap flow profiles, are important as well. © 2020 Elsevier B.V.
关键词	Budget control Physiological models Saline water Watersheds Wetlands Wood products Atmospheric conditions Freshwater wetlands Physiological response Salinity gradients Salinity intrusion Taxodium distichum Water use reductions Wetland water budget Forestry deciduous tree ecophysiology environmental gradient freshwater environment salinity sap flow shrub stand structure swamp forest water budget water use watershed wetland Cost Control Forestry Nyssa Salinity Taxodium Distichum Trees Wetlands Wood Products South Carolina United States Morella cerifera Nyssa aquatica Nyssa biflora Taxodium distichum
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132685
推荐引用方式 GB/T 7714	Duberstein J.A.,Krauss K.W.,Baldwin M.J.,et al. Small gradients in salinity have large effects on stand water use in freshwater wetland forests[J]. Forest Ecology and Management,2020,473.
APA	Duberstein J.A..,Krauss K.W..,Baldwin M.J..,Allen S.T..,Conner W.H..,...&Miloshis M..(2020).Small gradients in salinity have large effects on stand water use in freshwater wetland forests.,473.
MLA	Duberstein J.A.,et al."Small gradients in salinity have large effects on stand water use in freshwater wetland forests".473(2020).