气候变化领域集成服务门户(CCPortal): Decadal-scale decoupling of soil phosphorus and molybdenum cycles by temperate nitrogen-fixing trees

CCPortal

DOI	10.1007/s10533-020-00680-9
	Decadal-scale decoupling of soil phosphorus and molybdenum cycles by temperate nitrogen-fixing trees
	Dynarski K.A.; Pett-Ridge J.C.; Perakis S.S.
发表日期	2020
ISSN	0168-2563
起始页码	355
结束页码	371
卷号	149 期号:3
英文摘要	Symbiotic nitrogen- (N) fixing trees can influence multiple biogeochemical cycles by fixing atmospheric N, which drives net primary productivity and soil carbon (C) and N accumulation, as well as by mobilizing soil phosphorus (P) and other nutrients to support growth and metabolism. The soil micronutrient molybdenum (Mo) is essential to N-fixation, yet surprisingly little is known of whether N-fixing trees alter soil Mo cycling, and if changes to soil Mo are coupled to soil C, N, and P. We compared how symbiotic N-fixing red alder and non-N-fixing Douglas-fir trees modified surface soil C, N, P, and Mo across variation in climate and other site factors in the Pacific Northwest. We found that after two decades, N-fixing trees drove coupled increases in surface soil C, N, total P, and organic P. Consistent with contributions of N-fixing trees to soil organic matter, increased soil C and N were accompanied by lower δ13C in all sites, and lower δ15N in sites where non-fixer plots exhibited elevated soil δ15N. However, N-fixing trees did not affect surface soil Mo concentrations or fractions, suggesting that different factors control the cycling of P versus Mo over decadal timescales. Random forest analysis revealed that surface soil P was most strongly influenced by factors related to soil C accumulation, whereas surface soil Mo was related primarily to environmental factors, including potential differences in atmospheric Mo deposition across sites. Ratios of surface soil P:Mo were higher in extractable pools than in total soil digests, reinforcing the idea of stronger biotic cycling of P than Mo. Overall, our multi-site, multi-decadal field study found surprisingly small effects of N-fixing trees on soil Mo, despite rapid increases in soil organic C, N, and P. We hypothesize that, rather than direct effects of N-fixing vegetation, abiotic or indirect biotic factors such as soil sorption of atmospheric Mo inputs can link C–N–P–Mo cycles in terrestrial ecosystems on longer timescales. © 2020, Springer Nature Switzerland AG.
英文关键词	Alnus rubra; Frankia; Molybdenum; Nitrogen fixation; Phosphorus; Pseudotsuga menzieseii; Soil organic matter
语种	英语
scopus关键词	biogeochemistry; coniferous forest; forest soil; metabolism; molybdenum; nitrifying bacterium; nitrogen fixation; nutrient cycling; phosphorus; soil chemistry; temperate environment; Abies; Alnus rubra; Frankia; Pseudotsuga; Pseudotsuga menziesii
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/153123
作者单位	Department of Land, Air, and Water Resources, University of California, Davis, CA 95616, United States; Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331, United States; Forest and Rangeland Ecosystem Science Center, US Geological Survey, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
推荐引用方式 GB/T 7714	Dynarski K.A.,Pett-Ridge J.C.,Perakis S.S.. Decadal-scale decoupling of soil phosphorus and molybdenum cycles by temperate nitrogen-fixing trees[J],2020,149(3).
APA	Dynarski K.A.,Pett-Ridge J.C.,&Perakis S.S..(2020).Decadal-scale decoupling of soil phosphorus and molybdenum cycles by temperate nitrogen-fixing trees.Biogeochemistry,149(3).
MLA	Dynarski K.A.,et al."Decadal-scale decoupling of soil phosphorus and molybdenum cycles by temperate nitrogen-fixing trees".Biogeochemistry 149.3(2020).