Nitrogen additions mobilize soil base cations in two tropical forests

Cusack, Daniela; Macy, Jordan; McDowell, William H.

doi:10.1007/s10533-016-0195-7

Cited by 46 publications

(23 citation statements)

References 82 publications

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“…Therefore, significant negative correlations were detected between soil NO − 3 and base cations in this study (Table 2). Soil extractable NH + 4 was also negatively correlated with exchangeable Ca and Mg, possibly because NH + 4 can exchange with base cations on surface soil colloids into soil solution, thereby enhancing their loss Cusack et al, 2016).…”

Section: Elevational Patterns Of Base Cations and Available Micronutrmentioning

confidence: 99%

Soil properties determine the elevational patterns of base cations and micronutrients in the plant–soil system up to the upper limits of trees and shrubs

Wang

Jiang

et al. 2018

Biogeosciences

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Abstract. To understand whether base cations and micronutrients in the plant-soil system change with elevation, we investigated the patterns of base cations and micronutrients in both soils and plant tissues along three elevational gradients in three climate zones in China. Base cations (Ca, Mg, and K) and micronutrients (Fe, Mn, and Zn) were determined in soils, trees, and shrubs growing at lower and middle elevations as well as at their upper limits on Balang (subtropical, SW China), Qilian (dry temperate, NW China), and Changbai (wet temperate, NE China) mountains. No consistent elevational patterns were found for base cation and micronutrient concentrations in both soils and plant tissues (leaves,

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Section: Elevational Patterns Of Base Cations and Available Micronutrmentioning

confidence: 99%

Soil properties determine the elevational patterns of base cations and micronutrients in the plant–soil system up to the upper limits of trees and shrubs

Wang

Jiang

et al. 2018

Biogeosciences

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“…Several tropical field studies demonstrate that the processes described above are prevalent in highly weathered tropical soils when N is added. For example, an N fertilization study in two tropical forests in Puerto Rico showed significant mobilization of base cations over 5 years, with an increasing effect over time [ Cusack et al ., ]. Similarly, increased acidity with N fertilization was related to increased mobility of base cations in a humid tropical Panamanian forest on highly weathered soils [ Turner et al ., ].…”

Section: Review Of Global Change Effects On Tropical Ecosystemsmentioning

confidence: 99%

Global change effects on humid tropical forests: Evidence for biogeochemical and biodiversity shifts at an ecosystem scale

Cusack

Karpman

Ashdown

et al. 2016

Reviews of Geophysics

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Government and international agencies have highlighted the need to focus global change research efforts on tropical ecosystems. However, no recent comprehensive review exists synthesizing humid tropical forest responses across global change factors, including warming, decreased precipitation, carbon dioxide fertilization, nitrogen deposition, and land use/land cover changes. This paper assesses research across spatial and temporal scales for the tropics, including modeling, field, and controlled laboratory studies. The review aims to (1) provide a broad understanding of how a suite of global change factors are altering humid tropical forest ecosystem properties and biogeochemical processes; (2) assess spatial variability in responses to global change factors among humid tropical regions; (3) synthesize results from across humid tropical regions to identify emergent trends in ecosystem responses; (4) identify research and management priorities for the humid tropics in the context of global change. Ecosystem responses covered here include plant growth, carbon storage, nutrient cycling, biodiversity, and disturbance regime shifts. The review demonstrates overall negative effects of global change on all ecosystem properties, with the greatest uncertainty and variability in nutrient cycling responses. Generally, all global change factors reviewed, except for carbon dioxide fertilization, demonstrate great potential to trigger positive feedbacks to global warming via greenhouse gas emissions and biogeophysical changes that cause regional warming. This assessment demonstrates that effects of decreased rainfall and deforestation on tropical forests are relatively well understood, whereas the potential effects of warming, carbon dioxide fertilization, nitrogen deposition, and plant species invasions require more cross-site, mechanistic research to predict tropical forest responses at regional and global scales.

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“…Nitrogen deposition has been intensive in China in recent years, with higher rates in P‐deficient subtropical regions (Jia et al ., ). Different amounts of N input can have contrasting effects on root growth by differentially influencing soil pH (Matson et al ., ), nutrient availability (Cusack et al ., ), and plant uptake (Nordin et al ., ). The timing and amount of root growth can also vary with soil depth as a result of the variability in soil temperature and resource availability.…”

Section: Introductionmentioning

confidence: 99%

Unaltered phenology but increased production of ectomycorrhizal roots of Pinus elliottii under 4 years of nitrogen addition

Kou

Wang

et al. 2018

New Phytologist

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Summary Timing (phenology) and amount (production) are two integral facets of root growth, and their shifts have profound influences on below‐ground resource acquisition. However, the environmental control and the effects of nitrogen (N) deposition on the production and phenology of ectomycorrhizal (ECM) roots remain unclear. Using a 4 yr minirhizotron experiment, we explored the control of the production and three phenophases (initiation, peak, and cessation of growth) of ECM roots in two soil layers and investigated their dynamic responses to N addition in a seasonally dry subtropical Pinus elliottii forest. We found a stronger control of water availability on the production and a stronger control of temperature on the phenology of ECM roots under ambient conditions. Temperature was correlated positively with initiation and negatively with cessation, especially in the shallow layer. N addition did not affect the phenology of ECM roots but increased their production by modifying N and phosphorus (P) stoichiometry in the soil and foliage. Our findings suggest a greater sensitivity of production than phenology of ECM roots to N addition. The increased production of ECM roots under N addition could be driven by N‐induced P limitation or some combination of below‐ground resources (P, N, water).

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Nitrogen additions mobilize soil base cations in two tropical forests

Cited by 46 publications

References 82 publications

Soil properties determine the elevational patterns of base cations and micronutrients in the plant–soil system up to the upper limits of trees and shrubs

Soil properties determine the elevational patterns of base cations and micronutrients in the plant–soil system up to the upper limits of trees and shrubs

Global change effects on humid tropical forests: Evidence for biogeochemical and biodiversity shifts at an ecosystem scale

Unaltered phenology but increased production of ectomycorrhizal roots of Pinus elliottii under 4 years of nitrogen addition

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