Abstract
Equilibrium carbon stock is the result of a balance between inputs and outflows to the pool. Changes in land-use are likely to alter such balance, resulting in different carbon stores under different land-use types in addition to the impacts of global climate change. In an agro-pastoral ecotone of Inner Mongolia, northern China, we investigated productivity and belowground carbon and nitrogen stores under six different types of land-uses, namely free grazing (FG), grazing exclusion (GE), mowing (MW), corn plantation (CP), fallow (FL), and alfalfa pasture (AP), and their impacts on litter and fine roots in semiarid grassland ecosystems. We found that there were great variations in aboveground net primary production (ANPP) across the six land-use types, with CP having markedly high ANPP; the FG had significantly reduced soil organic carbon (SOC) and nitrogen stores (SON) to 100 cm depth compared with all other types of land uses, while very little litter accumulation was found on sites of the FG and CP. The top 20 cm of soils accounted for about 80% of the root carbon and nitrogen, with very little roots being found below 50 cm. About 60% of SOC and SON were stored in the top 30 cm layer. Land-use change altered the inputs of organic matters, thus affecting SOC and SON stores accordingly; the MW and GE sites had 59 and 56% more SOC and 61% more SON than the FG. Our estimation suggested that restoring severely degraded and overgrazed grasslands could potentially increase SOC and SON stores by more than 55%; conversion from the native grasses to alfalfa could potentially double the aboveground biomass production, and further increase SOC and SON stores by more than 20%. Our study demonstrated significant carbon and nitrogen storage potential of the agro-pastoral ecotone of northern China through land-use changes and improved management in the context of mitigating global climate change.
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Bai YF (1999) Influence of seasonal distribution of precipitation on primary productivity of Stipa krylovii community. Acta Phytoecol Sin 23:155–160
Bao YJ, Li ZH, Zhong YK (2004) Compositional dynamics of plant functional groups and their effects on stability of community ANPPduring 17 yr of mowing succession on Leymus chinensis steppe of Inner Mongolia, China. Acta Bot Sin 46:1155–1162
Baoyin T, Liu D (2001) The changing of ploughland and analysis of problem of Duo Lun County on agriculture-animal husbandry ecotone. Acta Sci Nat Uni NeiMongol 32:657–660
Bernacchi CJ, Hollinger SE, Meyers T (2005) The conversion of the corn/soybean ecosystem to no-till agriculture may result in a carbon sink. Global Change Biol 11:1867–1872
Brown S, Lugo AE (1990) Effects of forest clearing and succession on the carbon and nitrogen content of soils in Puerto Rico and US Virgin Islands. Plant Soil 124:53–64
Brye KR, Gower ST, Norman JM et al (2002) Carbon budgets for a prairie and agroecosystems: effects of land use and interannual variability. Ecol Appl 12:962–979
Burke IC, Laurenroth WK, Milchunas DG (1997) Biogeochemistry of managed grasslands in central North America. In: Paul EA, Elliott ET, Paustian K, Cole CV (eds) Soil organic matter in temperature agroecosystems: long-term experiments in North America. CRC Press, Boca Rato, FL, pp 85–102
Cambardella CA, Elliott ET (1992) Particulate soil organicmatter changes across a grassland cultivation sequence. Soil Sci Soc Am J 56:777–783
Canadell JG (2002) Land use effects on terrestrial carbon sources and sinks. Sci China Ser C 45(Supplement):1–9
Chuluun T, Ojima D (2002) Land use change and carbon cycle in arid and semi-arid lands of East and Central Asia. Sci China Ser C 45(Supplement):48–54
Conant RT, Paustian K, Elliott ET (2001) Grassland management and conversion into grassland: effects on soil carbon. Ecol Appl 11:343–355
Cramer W, Kicklighter DW, Bondeau A et al (1999) Comparing global models of terrestrial net primary productivity (NPP): overview and key results. Global Change Biol 5:1–15
Davidson EA, Nepstad DC, Klink C et al (1995) Pasture soils as carbon sink. Nature 376:472–473
Degryze S, Six J, Paustian K et al (2004) Soil organic carbon pool changes following land-use conversions. Global Change Biol 10:1120–1132
Derner JD, Briske DD, Boutton TW (1997) Does grazing mediate soil carbon and nitrogen accumulation beneath C4 perennial grasses along an environmental gradient? Plant Soil 191:47–156
Fales SL, Laidlaw AS, Lamber MG (1996) Cool-season grass ecosystems. In: Moser LE, Buxton DR, Casler MD (eds) Cool-Season Forage Grasses. American Society of Agronomy, Madison, WI, pp 267–296
Falkowski P, Scholes RJ, Boyle E et al (2000) The global carbon cycle: a test of our knowledge of earth as a system. Science 290:291–295
Fisher MJ, Rao IM, Ayarza MA et al (1994) Carbon storage by introduced deep-rooted grasses in the South American savannas. Nature 371:236–238
Frank DA, Groffman PM (1998) Ungulate vs. landscape control of soil C and N processes in grasslands of Yellowstone National Park. Ecology 79:2229–2241
Gallaher RN, Weldon CO, Boswell FC (1976) A semiautomated procedure for total nitrogen in plant and soil samples. Soil Sci Soc Am J 40:887–889
Global Carbon Project (2003) Science Framework and Implementation. Earth System Science Partnership (IGBP, IHDP, WCRP, DIVERSITAS) Report No. 1; Global Carbon Project Report No. 1, 69 pp, Canberra
Grünzweig JM, Sparrow S, Yakir D et al (2004) Impact of agricultural land-use change on carbon storage in Boreal Alaska. Global Change Biol 10:452–472
Guo LB, Gifford RM (2002) Soil carbon stocks and land use change: a meta analysis. Global Change Biol 8:345–360
Hall DO, Scurlock JMO (1991) Climate change and productivity of natural grasslands. Ann Bot 67:49–55
Houghton RA, Hackler JL, Lawrence KT (1999) The U.S. carbon budget: contributions from land-use change. Science 285:574–578
Jackson RB, Mooney HA, Schulze ED (1997) A global budget for fine root biomass, surface area, and nutrient contents. PNAS 94:7362–7366
Lal R (2002) Soil carbon dynamics in cropland and rangeland. Environ Pollut 116:353–362
Li LH, Liu XH, Chen ZZ (1998) Study on the carbon cycle of Leymus chinensis steppe in the Xilin River Basin. Acta Bot Sin 40:955–961
Liu P, Huang J, Han X et al (2006) Differential responses of litter decomposition to increased soil nutrients and water between two contrasting grassland plant species of Inner Mongolia, China. Appl Soil Ecol 34:266–275
Liu QY, Tong YP (2003) The effects of land use on the eco-environmental evolution of farming-pastoral region in North China: With an emphasis on Duolun County in Inner Mongolia. Acta Ecol Sin 23:1025–1030
McNaughton SJ (1985) Ecology of a grazing ecosystem: the serengeti. Ecol Monogr 55:259–294
McNaughton SJ, Banyikawa FF, McNaughton MM (1997) Promotion of the cycling of diet-enhancing nutrients by African grazers. Science 278:1798–1800
Nelson DW, Sommers LE (1982) Total carbon, organic carbon, and organic matter. In: Page AL, Miller RH, Keeney DR (eds) Methods of soil analysis. American Society of Agronomy and Soil Science Society of American, Madison, WI, pp 101–129
Nemani RR, Keeling CD, Hashimoto H et al (2003) Climate-driven increases in global terrestrial net primary production from 1982 to 1999. Science 300:1560–1563
Ojima DS, Dirks BOM, Glenn EP et al (1993a) Assessment of C budget for grasslands and drylands of the world. Water Air Soil Poll 70:95–109
Ojima DS, Parton WJ, Schimel DS et al (1993b) Modeling the effects of climatic and CO2 changes on grassland storage of soil C. Water Air Soil Poll 70:643–657
Parton WJ, Scurlock JMO, Ojima DS et al (1993) Observations and modeling of biomass and soil organic matter dynamics for the grassland biome worldwide. Global Biogeochem Cy 7:785–809
Petti JR, Jouzel J, Raynaud D et al (1999) Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica. Nature 399:429–436
Piao SL, Fang JY, He JS et al (2004) Spatial distribution of grassland biomass in China. Acta Phytoecol Sin 28:491–498
Post WM, Emanuel WR, Zinke PJ et al (1982) Soil carbon pools and world life zones. Nature 298:156–159
Post WM, Kwon KC (2000) Soil carbon sequestration and land-use change: processes and potential. Global Change Biol 6:317–327
Richter DD, Markewitz D, Trumbore SE et al (1999) Rapid accumulation and turnover of soil carbon in a re-establishing forest. Nature 400:56–58
Ross DJ, Tate KR, Scott NA et al (1999) Land-use change: effects on soil carbon, nitrogen and phosphorus pools and fluxes in three adjacent ecosystems. Soil Biol Biochem 31:803–813
Sala OE, Austin AT (2000) Methods of estimating aboveground net primary productivity. In: Sala OE, Jackson RB, Mooney HA et al. (eds) Methods in ecosystem science. Springer-Verlag, New York, pp 31–43
Sala OE, Parton WJ, Joyce LA et al (1988) Primary production of the central grassland region of the United States. Ecology 69:40–45
Schimel DS (1995) Terrestrial ecosystems and the carbon cycles. Global Change Biol 1:77–91
Schuman GE, Booth DT, Waggoner JW (1990) Grazing reclaimed mined lands seeded to native grasses in Wyoming. Journal of Soil and Water Conservation 45:653–657
Schuman GE, Reeder JD, Manley JT et al (1999) Impact of grazing management on the carbon and nitrogen balance of a mixed-grass rangeland. Ecol Appl 9:65–71
Scurlock JMO, Hall DO (1998) The global carbon sink: a grassland perspective. Global Change Biol 4:229–233
Sun OJ, Campbell J, Law BE et al (2004) Dynamics of carbon storage in soils and detritus across chronosequences of different forest types in the Pacific Northwest, USA. Global Change Biol 10:1470–1481
Sun HL (ed) (2005) Ecosystems of China. Science Press, Beijing
Tans PP, Fung IY, Takahashi T (1990) Observational constraints on the global atmospheric CO2 budget. Science 247:1431–1438
Wang SP, Wang YF, Chen ZZ (2003) The relationship between plant community productivity and forage quality. In: The management of grazing ecosystem. China Science Press, Beijing, pp 45–59
Wang YH, Zhou GS (2004) Responses of temporal dynamics of aboveground net primary productivity of Leymus chinensis community to precipitation fluctuation in Inner Mongolia. Acta Ecol Sin 24:1140–1145
Watson RT, Noble IR, Bolin B et al (2000) Land use, land-use change and forestry. In: Special Report of the IPCC, Cambridge, Cambridge University Press, 377 pp
Wilson AT (1978) Pioneer agriculture explosion and CO2 levels in the atmosphere. Nature 273:40–41
Wright AL, Hons FM, Rouquette Jr FM (2004) Long-term management impacts on soil carbon and nitrogen dynamics of grazed bermudagrass pastures. Soil Biol Biochem 36:1809–1816
Wu HB, Guo ZT, Peng CH (2003) Land use induced changes of organic carbon storage in soils of China. Global Change Biol 9:305–315
Xiao XM, Wang YF, Jiang S et al (1995) Interannual variation in the climate and above-ground biomass of Leymus Chinense steppe and Stipa grandis steppe in the Xilin river basin, Inner Mongolia, China. J Arid Environ 31:283–299
You LY, Lu JF, Chen H et al (2003) Adjustment of land use types for desertification control and prevention: Taking Duolun county of Inner Mongolia as a typical case. Geograph Res 22(6):680–686
Zhan JY, Deng XZ, Yue TX et al (2004) Land use change and its environmental effects in the farming-pasturing interlocked areas of Inner Mongolia. Resources Science 26(5):80–88
Acknowledgements
This research was partially supported by the National Natural Science Foundation of China (30330150 & 30521002), and a “Talent Recruitment” fund from Institute of Botany of the Chinese Academy of Sciences to OJS. We are grateful to the Duolun Restoration Ecological Experimentation and Demonstration Station for access permission to the study sites and research facilities. We wish to thank Bai WM, Gao YZ, Song SH, Tian JQ, Wang GM, Yan ZD, Yuan ZY, Zhao HT, Zhao W, Zhu L and Xu WT for their helps with field sampling and data collection, and Chen QS for technical advice on statistical analysis.
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Zhou, Z., Sun, O.J., Huang, J. et al. Soil carbon and nitrogen stores and storage potential as affected by land-use in an agro-pastoral ecotone of northern China. Biogeochemistry 82, 127–138 (2007). https://doi.org/10.1007/s10533-006-9058-y
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DOI: https://doi.org/10.1007/s10533-006-9058-y