气候变化领域集成服务门户(CCPortal): Leaf litter inputs reinforce islands of nitrogen fertility in a lowland tropical forest

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DOI	10.1007/s10533-020-00643-0
	Leaf litter inputs reinforce islands of nitrogen fertility in a lowland tropical forest
	Osborne B.B.; Nasto M.K.; Soper F.M.; Asner G.P.; Balzotti C.S.; Cleveland C.C.; Taylor P.G.; Townsend A.R.; Porder S.
发表日期	2020
ISSN	1682563
卷号	147 期号:3
英文摘要	The role of lowland tropical forest tree communities in shaping soil nutrient cycling has been challenging to elucidate in the face of high species diversity. Previously, we showed that differences in tree species composition and canopy foliar nitrogen (N) concentrations correlated with differences in soil N availability in a mature Costa Rican rainforest. Here, we investigate potential mechanisms explaining this correlation. We used imaging spectroscopy to identify study plots containing 10–20 canopy trees with either high or low mean canopy N relative to the landscape mean. Plots were restricted to an uplifted terrace with relatively uniform parent material and climate. In order to assess whether canopy and soil N could be linked by litterfall inputs, we tracked litter production in the plots and measured rates of litter decay and the carbon and N content of leaf litter and leaf litter leachate. We also compared the abundance of putative N fixing trees and rates of free-living N fixation as well as soil pH, texture, cation exchange capacity, and topographic curvature to assess whether biological N fixation and/or soil properties could account for differences in soil N that were, in turn, imprinted on the canopy. We found no evidence of differences in legume communities, free-living N fixation, or abiotic properties. However, soils beneath high canopy N assemblages received ~ 60% more N via leaf litterfall due to variability in litter N content between plot types. The correlation of N in canopy leaves, leaf litter, and soil suggests that, under similar abiotic conditions, litterfall-mediated feedbacks can help maintain soil N differences among tropical tree assemblages in this diverse tropical forest. © 2020, Springer Nature Switzerland AG.
英文关键词	Canopy chemistry; Carnegie airborne observatory; Imaging spectroscopy; Plant functional traits; Soil
学科领域	cation exchange capacity; fertility; leaf litter; legume; nitrogen fixation; nutrient cycling; parent material; soil nutrient; tropical forest; Costa Rica
语种	英语
scopus关键词	cation exchange capacity; fertility; leaf litter; legume; nitrogen fixation; nutrient cycling; parent material; soil nutrient; tropical forest; Costa Rica
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120378
作者单位	Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02912, United States; Department of Wildland Resources, Utah Forest Institute, Utah State University, Logan, UT 84322, United States; Department of Ecosystem and Conservation Science, University of Montana, Missoula, MT 59808, United States; Center for Global Discovery and Conservation Science, Arizona State University, Tempe, AZ 94305, United States; The Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80903, United States; Environmental Science, Colorado College, Colorado Springs, CO 80303, United States
推荐引用方式 GB/T 7714	Osborne B.B.,Nasto M.K.,Soper F.M.,et al. Leaf litter inputs reinforce islands of nitrogen fertility in a lowland tropical forest[J],2020,147(3).
APA	Osborne B.B..,Nasto M.K..,Soper F.M..,Asner G.P..,Balzotti C.S..,...&Porder S..(2020).Leaf litter inputs reinforce islands of nitrogen fertility in a lowland tropical forest.Biogeochemistry,147(3).
MLA	Osborne B.B.,et al."Leaf litter inputs reinforce islands of nitrogen fertility in a lowland tropical forest".Biogeochemistry 147.3(2020).