How do persistent organic pollutants be coupled with biogeochemical cycles of carbon and nutrients in terrestrial ecosystems under global climate change?

The influence of global climate change on the environmental fate of persistent organic pollutants: A review with emphasis on the Northern Hemisphere and the Arctic as a receptor

“…On the other hand, the strong association of POPs with OC pools in soils demands that we also consider change in soil biogeochemistry (quality and quantity of OC), which is affected by processes such as loss or gain of plant material, humus accumulation, and loss of soil carbon by metabolism. Each of these processes has the potential to alter the thermodynamic stability of POPs in the surface reservoir (Moeckel et al 2008(Moeckel et al , 2009Teng et al, 2012). Thus, POPs cycling between surface and atmosphere in terrestrial environments is linked both to physical changes (e.g., temperature and moisture) and biogeochemical changes (e.g., carbon cycle) with the latter also providing feedback in the coupling between terrestrial ecosystems and the climate system (Cao and Woodward, 1998a and b;Falkowski et al 2000;Xu and Chen 2006;Chen and Xu, 2010;Prentice, 2001;McGuire et al, 2009).…”

“…For some water soluble POPs such as perfluorooctane 14 sulfonate (PFOS), warmer temperatures may increase plant uptake by transpiration, although these changes may be offset by the effects of increased carbon dioxide in carbon cycling that could reduce the activity of plant stomata and reduce plant transpiration. This would in turn affect the uptake and deposition of POPs to terrestrial surfaces, sequestering them and moving them into vegetation-covered soil C pools Teng et al, 2012). Bioavailability of POPs in soils (i.e., a higher proportion may be in the dissolved phase in soil-water system) may increase with the predicted decline in soil organic carbon content (Bellamy et al, 2005).…”

Can Carbon in Bioenergy Crops Mitigate Global Climate Change?

“…If we are to quantify the major pools and fluxes in the biogeochemical cycles of water, C, N, and other nutrients in biofuel crops, and to determine how and on what timescale interactions with soil biota affect these biogeochemical cycles [307], then the lingering question is how to decouple persistent organic pollutants from biogeochemical cycles of water, C, N, and other nutrients under global climate change [321]? In particular, what would be the fate and transport of C and N during biomass production, if we know that they interact, at multiple spatio-temporal scales, with other biogeochemical processes [45]?…”

“…Changes in biogeochemical cycles are attributed to shifts in vegetation, decreased organic C due to soil organic matter decomposition, and rise in pH; soil organic matter, in turn, closely controls many soil properties and major biogeochemical cycles [11,17,164,169,321]. Therefore, desirable biogeochemical properties may include increased soil organic matter, increased N mineralization potential, and reduced NO 3 leaching [82,135,206,215,247].…”

“…The intensive, and usually short, production season of annual crops under temperate climates and summer rains involves long periods with little or no water and nutrient uptake; the biogeochemical implications of such agroecosystems include integrated surface runoff, soil erosion, nutrient loss, and groundwater contamination by agrochemicals [17,321]. Intensive grain production, extensive bioenergy crop deployment, and projected global climate change, if combined, will exacerbate these environmental problems, and may worsen landscape and water energy balances, and water quality problems through eutrophication and acidification [16,80,277,322,323].…”