DOI: 10.1007/s10533-015-0121-4
Scopus记录号: 2-s2.0-84941875340
论文题名: Soil organic matter regulates molybdenum storage and mobility in forests
作者: Marks J.A. ; Perakis S.S. ; King E.K. ; Pett-Ridge J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 2 起始页码: 167
结束页码: 183
语种: 英语
英文关键词: Molybdenum
; Nitrogen fixation
; Oregon coast range
; Soil organic matter
Scopus关键词: bedrock
; bioaccumulation
; bioavailability
; biogeochemistry
; concentration (composition)
; forest ecosystem
; leaching
; lithology
; litterfall
; mobility
; molybdenum
; nitrogen cycle
; nitrogen fixation
; precipitation (chemistry)
; soil organic matter
英文摘要: The trace element molybdenum (Mo) is essential to a suite of nitrogen (N) cycling processes in ecosystems, but there is limited information on its distribution within soils and relationship to plant and bedrock pools. We examined soil, bedrock, and plant Mo variation across 24 forests spanning wide soil pH gradients on both basaltic and sedimentary lithologies in the Oregon Coast Range. We found that the oxidizable organic fraction of surface mineral soil accounted for an average of 33 % of bulk soil Mo across all sites, followed by 1.4 % associated with reducible Fe, Al, and Mn-oxides, and 1.4 % in exchangeable ion form. Exchangeable Mo was greatest at low pH, and its positive correlation with soil carbon (C) suggests organic matter as the source of readily exchangeable Mo. Molybdenum accumulation integrated over soil profiles to 1 m depth (τMoNb ) increased with soil C, indicating that soil organic matter regulates long-term Mo retention and loss from soil. Foliar Mo concentrations displayed no relationship with bulk soil Mo, and were not correlated with organic horizon Mo or soil extractable Mo, suggesting active plant regulation of Mo uptake and/or poor fidelity of extractable pools to bioavailability. We estimate from precipitation sampling that atmospheric deposition supplies, on average, over 10 times more Mo annually than does litterfall to soil. In contrast, bedrock lithology had negligible effects on foliar and soil Mo concentrations and on Mo distribution among soil fractions. We conclude that atmospheric inputs may be a significant source of Mo to forest ecosystems, and that strong Mo retention by soil organic matter limits ecosystem Mo loss via dissolution and leaching pathways. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83465
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: Department. Crop & Soil Science, Oregon State University, Corvallis, OR, United States; US Geological Survey, Forest and Range Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Marks J.A.,Perakis S.S.,King E.K.,et al. Soil organic matter regulates molybdenum storage and mobility in forests[J]. Biogeochemistry,2015-01-01,125(2)