Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
2013 | 61 | 2 |
Tytuł artykułu

Effects of snowpack and litter decomposition on nitrogen dynamics in soil of the Alpine zone of the Eastern Tibetan Plateau

Treść / Zawartość
Warianty tytułu
Języki publikacji
Microbes remain active and play an important role in soil nitrogen (N) cycle during the winter in soil of the alpine zone. A shift from microbial N immobilization process dominant during summer to prevailing microbial mineralization process during the winter is observed. Warmer soil under deep snow cover may increase the microbial activity and rate of organic matter decomposition over the winter. Furthermore, severe shortages of dissolved carbon (C) in the winter may cause microbial mortality and lyses. Thus, C limitation on microbial growth and activity may have an important effect on winter N mineralization and even on soil N pools. However, the combined effects of additional organic C (litter inputs) and snow cover on soil N biogeochemical processes in the Tibetan Plateau remain unclear. In the current study, the in situ effects of snowpack and litter decomposition on N dynamics in the alpine zone of the Eastern Tibetan Plateau were investigated. Intact soil core incubations in three different snow regimes (0, 30 and 100 cm depth snow) in the winter were used to solve the problem by measure concentrations of mineral form of soil N. In addition, the litter bag method was used to analyze the litter decomposition over the winter. Our results indicate that the snow cover reduced the ammonium (NH₄⁺-N) content, accelerate N mineralization in soil, and did not significantly change the dissolvable organic nitrogen (DON) and microbial biomass nitrogen (MBN). Meanwhile, snowpack increased the litter N content and accelerated litter decomposition in late winter. Litter addition reduced the MBN and NH₄⁺ -N contents in soil, but increased the nitrate (NO₃⁻ -N) content and net N mineralization, suggesting that N availability to plants during the spring thaw period may be enhanced.
Opis fizyczny
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • ECORES Lab, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu 610041, China
  • Austnes K., Vestgarden L.S. 2008 – Prolonged frost increases release of C and N from a montane heathland soil in southern Norway – Soil Bio. Biochem. 40: 2540–2546.
  • Bowman W.D. 1992 – Inputs and storage of nitrogen in winter snowpack in an alpine ecosystem – Arct. Antarct. Alp Res. 24: 211–215.
  • Brant J.B., Sulzman E.W., Myrold D.D. 2006 – Microbial community utilization of added carbon substrates in response to longterm carbon input manipulation – Soil Bio. Biochem. 38: 2219–2232.
  • Brookes P.C., Landman A., Pruden G., Jenkinson D.S. 1985 – Chloroform fumigation and the release of soil nitrogen: a rapid direct extraction method to measure microbial biomass nitrogen in soil – Soil Bio. Biochem. 17: 837–842.
  • Buckeridge K.M., Grogan P. 2008 – Deepened snow alters soil microbial nutrient limitations in arctic birch hummock tundra – Appl. Soil Ecol. 39: 210–222.
  • Casas J.J., Gessner M.O. 1999 – Leaf litter breakdown in a Mediterranean stream characterised by travertine precipitation – Freshwat. Biol. 41: 781–793.
  • Clein J.S., Schimel J.P. 1995 – Nitrogen turnover and availability during succession from alder to poplar in Alaskan taiga forests – Soil Bio. Biochem. 27: 743–752.
  • DiStefano J.F., Gholz H.L. 1986 – A proposed use of ion exchange resins to measure nitrogen mineralization and nitrification in intact soil cores – Commun Soil Sci. Plan. 17: 989–998.
  • Edwards A.C., Scalenghe R ., Freppaz M. 2007 – Changes in the seasonal snow cover of alpine regions and its effect on soil processes: A review – Quatern Int. 162-163: 172–181.
  • Elliott A.C., Henry H.A.L. 2009 – Freezethaw cycle amplitude and freezing rate effects on extractable nitrogen in a temperate old field soil – Biol. Fert. Soils. 45: 469–476.
  • Fisk M.C., Fahey T.J. 2001 – Microbial biomass and nitrogen cycling responses to fertilization and litter removal in young northern hardwood forests – Biogeochemistry, 53: 201–223.
  • Hart S.C., Binkley D., Perry D.A. 1997 – Influence of red alder on soil nitrogen transformations in two conifer forests of contrasting productivity – Soil Bio. Biochem. 29: 1111–1123.
  • Hefting M.M., Clement J.C., Bienkowski P., Dowrick D., Guenat C., Butturini A., Topa S., Pinay G., Verhoeven J.T.A. 2005 – The role of vegetation and litter in the nitrogen dynamics of riparian buffer zones in Europe – Ecol. Eng. 24: 465–482.
  • Holub S.M., Lajtha K., Spears J.D.H., Toth J.A., Crow S.E., Caldwell B.A., Papp M., Nagy P.T. 2005 – Organic matter manipulations have little effect on gross and net nitrogen transformations in two temperate forest mineral soils in the USA and central Europe – Forest Ecol. Manag. 214: 320–330.
  • Jones D.L., Willett V.B. 2006 – Experimental evaluation of methods to quantify dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) in soil – Soil Bio. Biochem. 38: 991–999.
  • Körner C. 2003 – Alpine Plant Life: Functional Plant Ecology of High Mountain Ecosystems – 2nd edn. Springer, Berlin, 344 pp.
  • Larsen K.S., Jonasson S., Michelsen A. 2002 – Repeated freeze-thaw cycles and their effects on biological processes in two arctic ecosystem types – Appl. Soil Ecol. 21: 187–195.
  • Li Y.Q., Xu M., Sun O.J., Cui W.C. 2004 – Effects of root and litter exclusion on soil CO2 efflux and microbial biomass in wet tropical forests – Soil Bio. Biochem. 36: 2111–2114.
  • Li H.T., Yu G.R., Li J.Y., Liang T., Chen Y.R. 2007 – [Dynamics of litter decomposition and phosphorus and potassium release in Jinggang Mounrain region of Jiangxi Province, China] – Chinese J. Appl. Ecol. 18: 233–240 (in Chinese, English summary).
  • Liu L., Wu Y., Wu N., Xu J.J., Mao Y., Luo P., Zhang L. 2010 – Effects of freezing and freeze-thaw cycles on soil microbial biomass and nutrient dynamics under different snow gradients in an alpine meadow (Tibetan Plateau) – Pol. J. Ecol. 58: 717–728.
  • López E.S., Pardo I., Felpeto N. 2001 – Seasonal differences in green leaf breakdown and nutrient content of deciduous and evergreen tree species and grass in a granitic headwater stream – Hydrobiologia, 464: 51–61.
  • Margret M.I., Vuuren V., Berendse F. 1993 – Changes in soil organic matter and net nitrogen mineralization in heathland soils, after removal, addition or replacement of litter from Erica tetralix or Molinia caerulea – Biol. Fert. Soils. 15: 268–274.
  • McClaugherty C.A., Pastor J., Abet J.D. 1985 – Forest litter decomposition in relation to soil nitrogen dynamics and litter quality – Ecology, 66: 266–275.
  • Moore T.R., Trofymow J.A., Taylor B., Prescott C., Camire C., Duschene L., Fyles J., Kozak L., Kranabetter M., Morrison I., Siltanen M., Smith S., Titus B., Visser S., Wein R., Zoltai S. 1999 – Litter decomposition rates in Canadian forests – Global Change Biol. 5: 75–82.
  • Mulvaney R.L. 1996 – Nitrogen-inorganic forms (In: Methods of Soil Analysis. Part 3: Chemical Methods, Ed: D.L. Sparks) – Soil Science Society of America and American Society of Agronomy, Madison, pp. 1123–1184.
  • Nadelhoffer K.J., Aber J.D., Melillo J.M. 1983 – Leaf-litter production and soil organic matter dynamics along a nitrogen-availability gradient in Southern Wisconsin (U.S.A) – Can. J. Forest Res. 13: 12–21.
  • Nadelhoffer K.J., Boone R.D., Bowden R.D., Canary J.D., Kaye J., Micks P., Ricca A., McDowell W. H., Aitkenhead J. 2004 – The DIRT experiment: litter and root influences on forest soil organic matter stocks and function (In: Forests in Time: the environmental consequences of 1000 years of Change in New England, Eds: D. Foster, J. Aber) – New Haven, CT: Yale University Press, pp. 300–315.
  • Pagiore T.A., Thomaz S.M. 1999 – Decomposition of Eichhornia azurea from limnologically different environments of the Upper Parana River floodplain – Hydrobiologia, 411: 45–51.
  • Paul E.A., Clark F.E. 1996 – Soil Microbiology and Biochemistry – 2nd edn, Academic Press, San Diego, 340 pp.
  • Schimel J.P., Bilbrough C., Welker J.M. 2004 – Increased snow depth affects microbial activity and nitrogen mineralization in two Arctic tundra communities – Soil Bio. Biochem. 36: 217–227.
  • Schimel J.P., Mikan C. 2005 – Changing microbial substrate use in Arctic tundra soils through a freeze-thaw cycle – Soil Bio. Biochem. 37: 1411–1418.
  • Schmidt S.K., Lipson D.A. 2004 – Microbial growth under snow: Implications for nutrient and allelochemical availability in temperate soils – Plant Soil. 259: 1–7.
  • Siira-Pietikäinen A., Haimi J., Kanninen A., Pietikäinen J., Fritze H. 2001 – Responses of decomposer community to rootisolation and addition of slash – Soil Bio. Biochem. 33: 1993–2004.
  • Staaf H., Berg B. 1982 – Accumulation and release of plant nutrients in decomposing Scot pine needle litter. Long-term decomposition in a Scot pine forest II – Can. J. Bot. 60: 1561–1568.
  • Sulkava P., Huhta V. 2003 – Effects of hard frost and freeze-thaw cycles on decomposer communities and N mineralisation in boreal forest soil – Applied Soil Ecol. 22: 225–239.
  • Taylor B.R ., Jones H.G. 1990 – Litter decomposition under snow cover in a balsam fir forest – Can. J. Bot. 68: 112–120.
  • Van Vuuren M. M. I., Berendse F., De Visser W. 1993 – Species and site differences in the decomposition of litters and roots from wet heathlands – Can. J. Bot. 71: 167–173.
  • Wan S.Q., Norby R .J., Ledford J., Weltzin J.F. 2007 – Responses of soil respiration to elevated CO2, air warming, and changing soil water availability in a model old-field grassland – Global Change Biol. 13: 2411–2424.
  • Wang G.J., Tian D.L., Yan W.D., Zhu F., Li S.Z. 2009 – Impact of litter addition and exclusion on soil respiration in a Liquidambar formosana forest and a nearby Cinnamomum camphora forest of central southern China – Acta Ecologica Sinica, 29: 643–652 (in Chinese, English summary).
  • Yang W.Q., Deng R.J., Zhang J. 2007 – Forest litter decomposition and its responses to global climate change – Chinese J. Appl. Ecol. 18: 2889–2895 (in Chinese, English summary).
  • Yu Z.Y., Chen F.S., Zeng D.H., Zhao Q., Chen G.S. 2008 – Soil inorganic nitrogen and microbial biomass carbon and nitrogen under pine plantations in Zhanggutai sandy soil – Pedosphere, 18: 775–784.
  • Zhang W.R ., Yang G.J., Tu X. 1999 – The forestry industry standard of PRC Forest soil analysis methods – China Standards Press, Beijing, pp. 274–278 (in Chinese).
Typ dokumentu
Identyfikator YADDA
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.