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Long-Term Phosphorus Addition Strongly Weakens the Carbon Sink Function of a Temperate Peatland
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- Lu, Fan (författare)
- Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Renmin 5268, Changchun 130024, Peoples R China.;Northeast Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Jilin Prov Key Lab Wetland Ecol Proc & Environm C, Renmin 5268, Changchun 130024, Peoples R China.
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- Wu, Jianghua (författare)
- Mem Univ Newfoundland, Sch Sci & Environm, Environm & Sustainabil, Grenfell Campus, Corner Brook, NF A2H 5G4, Canada.
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- Yi, Boli (författare)
- Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Renmin 5268, Changchun 130024, Peoples R China.;Northeast Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Jilin Prov Key Lab Wetland Ecol Proc & Environm C, Renmin 5268, Changchun 130024, Peoples R China.
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- Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Renmin 5268, Changchun 130024, Peoples R China;Northeast Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Jilin Prov Key Lab Wetland Ecol Proc & Environm C, Renmin 5268, Changchun 130024, Peoples R China. Mem Univ Newfoundland, Sch Sci & Environm, Environm & Sustainabil, Grenfell Campus, Corner Brook, NF A2H 5G4, Canada. (creator_code:org_t)
- 2022-03-18
- 2023
- Engelska.
- Ingår i: Ecosystems. - : SPRINGER. - 1432-9840 .- 1435-0629. ; 26:1, s. 201-216
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
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- Peatlands are important nutrient-limited, carbon (C)-accumulating ecosystems where phosphorus (P) is one major limiting nutrient. An increase in P input to peatlands has been observed close to agricultural areas. However, the effects of P input on gross primary productivity (GPP), ecosystem respiration (ER) and net ecosystem exchange (NEE) of peatlands, especially in temperate Asia, have been rarely studied. We selected the P addition plots of a 12-year experiment simulating environmental change in a peatland in northeastern China to evaluate the effect of P addition (5 and 10 kg ha(-1) y(-1)) on carbon dioxide fluxes. Our results showed that the growth of Sphagnum was inhibited but that of vascular plants was facilitated by P addition, resulting in an unchanged GPP. P addition increased ER due to the increased activity potentials of N-acetyl-beta-glucosaminidase (NAG) and polyphenol oxidase (POX) that might, in turn, increase the metabolic rate of soil microbes and enhance the decomposition of peat. During the growing season, a mean net CO2 absorption of 0.002 mg m(-2) s(-1) was observed at high levels of P addition, which was much lower than that of 0.063 mg m(-2) s(-1) in the controls. The results suggest that long-term P addition will greatly weaken the C sequestration in peatlands by enhancing ER rather than reducing GPP. Our study highlights the importance of the response of vegetation and soil enzyme activities to P addition regarding peatland respiration and C sink function.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- Sphagnum
- Changbai Mountains
- net ecosystem exchange
- polyphenol oxidase
- dissolved organic carbon
- enzyme activity potential
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