Patterns of Ca/Sr and 87Sr/86Sr variation before and after a whole watershed CaSiO3 addition at the Hubbard Brook Experimental Forest, USA

Nezat, Carmen A.; Driscoll, Charles T.

doi:10.1016/j.gca.2010.03.013

Cited by 22 publications

(26 citation statements)

References 53 publications

(86 reference statements)

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“…2A). Streamwater Ca concentrations in W1 increased immediately after the wollastonite application, as some wollastonite pellets began to dissolve, but declined rapidly over a 3-y period and stabilized thereafter (25) (Fig. 2B).…”

Section: Resultsmentioning

confidence: 98%

Decreased water flowing from a forest amended with calcium silicate

Green

Bailey

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Acid deposition during the 20th century caused widespread depletion of available soil calcium (Ca) throughout much of the industrialized world. To better understand how forest ecosystems respond to changes in a component of acidification stress, an 11.8-ha watershed was amended with wollastonite, a calcium silicate mineral, to restore available soil Ca to preindustrial levels through natural weathering. An unexpected outcome of the Ca amendment was a change in watershed hydrology; annual evapotranspiration increased by 25%, 18%, and 19%, respectively, for the 3 y following treatment before returning to pretreatment levels. During this period, the watershed retained Ca from the wollastonite, indicating a watershed-scale fertilization effect on transpiration. That response is unique in being a measured manipulation of watershed runoff attributable to fertilization, a response of similar magnitude to effects of deforestation. Our results suggest that past and future changes in available soil Ca concentrations have important and previously unrecognized implications for the water cycle.

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Section: Resultsmentioning

confidence: 98%

Decreased water flowing from a forest amended with calcium silicate

Green

Bailey

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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“…We anticipate that W1 will continue to respond to wollastonite treatment for the next few decades, since very little of the added Ca has left the ecosystem (Nezat et al 2010) Numbers in parentheses are dry-to-wet deposition ratios obtained from Chen and Driscoll (2005). .…”

Section: Discussionmentioning

confidence: 99%

Watershed-Level Responses to Calcium Silicate Treatment in a Northern Hardwood Forest

et al. 2012

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Approximately 2% of the added Ca and 7% of the added Si were exported from W1 in streamwater in the first six years after treatment. Watershed-scale Ca amendment with wollastonite appears to be an effective approach to mitigating effects of acidic deposition.Not only does it appear to alleviate acidification stress to forest vegetation, but it also provides for the long-term supply of ANC to acid-impacted rivers and lakes downstream.

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“…An 11.8-ha watershed (watershed 1, WS1) was treated with a Ca-silicate mineral (wollastonite; see Plate 1) to restore the Ca that was leached from the ecosystem by 50 years of acidic deposition (Peters et al 2004). The 1999 addition (850 kg/ha) was designed to increase the base saturation of watershed soils from ;10% to 19% (the modeled pre-acid rain value) and has resulted in marked changes in streamwater and soil pH and vegetation Ca dynamics (Juice et al 2006, Halman et al 2008, Cho et al 2010, Minocha et al 2010, Nezat et al 2010. Surprisingly, the Ca addition to WS1 resulted in a marked ''tightening'' of the ecosystem N cycle with declines in soil inorganic N pools, potential net N mineralization rates, and microbial biomass N (Groffman et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Calcium constrains plant control over forest ecosystem nitrogen cycling

Groffman

Fisk

2011

Ecology

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Abstract. Forest ecosystem nitrogen (N) cycling is a critical controller of the ability of forests to prevent the movement of reactive N to receiving waters and the atmosphere and to sequester elevated levels of atmospheric carbon dioxide (CO 2 ). Here we show that calcium (Ca) constrains the ability of northern hardwood forest trees to control the availability and loss of nitrogen. We evaluated soil N-cycling response to Ca additions in the presence and absence of plants and observed that when plants were present, Ca additions ''tightened'' the ecosystem N cycle, with decreases in inorganic N levels, potential net N mineralization rates, microbial biomass N content, and denitrification potential. In the absence of plants, Ca additions induced marked increases in nitrification (the key process controlling ecosystem N losses) and inorganic N levels. The observed ''tightening'' of the N cycle when Ca was added in the presence of plants suggests that the capacity of forests to absorb elevated levels of atmospheric N and CO 2 is fundamentally constrained by base cations, which have been depleted in many areas of the globe by acid rain and forest harvesting.

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Patterns of Ca/Sr and 87Sr/86Sr variation before and after a whole watershed CaSiO3 addition at the Hubbard Brook Experimental Forest, USA

Cited by 22 publications

References 53 publications

Decreased water flowing from a forest amended with calcium silicate

Decreased water flowing from a forest amended with calcium silicate

Watershed-Level Responses to Calcium Silicate Treatment in a Northern Hardwood Forest

Calcium constrains plant control over forest ecosystem nitrogen cycling

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