DOI: 10.1007/s10533-017-0341-x
Scopus记录号: 2-s2.0-85019650469
论文题名: Nutrient feedbacks to soil heterotrophic nitrogen fixation in forests
作者: Perakis S.S. ; Pett-Ridge J.C. ; Catricala C.E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 2018-01-02 起始页码: 41
结束页码: 55
语种: 英语
英文关键词: Carbon
; Feedback
; Molybdenum
; Nitrogen
; Nutrient limitation
; Phosphorus
; Soil organic matter
; Temperate forest
Scopus关键词: coniferous forest
; enzyme
; enzyme activity
; feedback mechanism
; molybdenum
; nitrogen
; nitrogen fixation
; nutrient cycling
; nutrient limitation
; phosphorus
; soil carbon
; soil nitrogen
; soil nutrient
; soil organic matter
; temperate forest
; Coniferophyta
英文摘要: Multiple nutrient cycles regulate biological nitrogen (N) fixation in forests, yet long-term feedbacks between N-fixation and coupled element cycles remain largely unexplored. We examined soil nutrients and heterotrophic N-fixation across a gradient of 24 temperate conifer forests shaped by legacies of symbiotic N-fixing trees. We observed positive relationships among mineral soil pools of N, carbon (C), organic molybdenum (Mo), and organic phosphorus (P) across sites, evidence that legacies of symbiotic N-fixing trees can increase the abundance of multiple elements important to heterotrophic N-fixation. Soil N accumulation lowered rates of heterotrophic N-fixation in organic horizons due to both N inhibition of nitrogenase enzymes and declines in soil organic matter quality. Experimental fertilization of organic horizon soil revealed widespread Mo limitation of heterotrophic N-fixation, especially at sites where soil Mo was scarce relative to C. Fertilization also revealed widespread absence of P limitation, consistent with high soil P:Mo ratios. Responses of heterotrophic N-fixation to added Mo (positive) and N (negative) were correlated across sites, evidence that multiple nutrient controls of heterotrophic N-fixation were more common than single-nutrient effects. We propose a conceptual model where symbiotic N-fixation promotes coupled N, C, P, and Mo accumulation in soil, leading to positive feedback that relaxes nutrient limitation of overall N-fixation, though heterotrophic N-fixation is primarily suppressed by strong negative feedback from long-term soil N accumulation. © 2017, Springer International Publishing Switzerland (outside the USA). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83263
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: US Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, OR, United States; Department of Crop and Soil Science, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Perakis S.S.,Pett-Ridge J.C.,Catricala C.E.. Nutrient feedbacks to soil heterotrophic nitrogen fixation in forests[J]. Biogeochemistry,2017-01-01,134(2018-01-02)