Abstract
Background
Meadows and shrublands are two major vegetation types on the Qinghai-Tibetan Plateau, but little is known about biochemical characteristics and its relation to decomposability of soil organic carbon (OC) under these two vegetation types. The present study was designed to evaluate effects of aspect-vegetation complex on biochemical characteristics and decomposability of soil OC.
Methods
Two hills were randomly selected; both with vegetation being naturally divided into southward meadows and northward shrublands by a ridge, and soils were sampled at depths of 0–15 and 15–30 cm, along contours traversing the meadow and shrubland sites. Particulate (particle size 2–0.05 mm) OC and nitrogen (N), microbial biomass C and N, non-cellulosic sugars, and CuO lignin were analyzed, and OC mineralization was measured for 49 days at 18 and 25 °C under laboratory incubation, respectively.
Results
More than half of soil OC was present as particulate fraction across all samples, indicating the coarse nature of soil organic matter in the region. Averaging over depths, shrublands contained 87.7 − 114.1 g OC and 7.7 − 9.3 g N per kg soil, which were 63 − 78 and 26 − 31 % higher than those in meadows, respectively. Meanwhile the C/N ratio of soil organic matter was 11.4 − 12.3 under shrublands, being 29 − 40 % higher than that under meadows. Soil OC under meadows was richer in noncellulosic carbohydrates and microbial biomass in the 0–15 and 15–30 cm depths but contained less lignin in the 15–30 cm depth. Ratios of microbially- to plant-derived monosaccharides and between acid and aldehyde of the vanillyl units were greater in soils under shrublands, showing more abundant microbially-derived sugars and microbially-transformed ligneous substances in OC as compared to meadow soils. By the end of 49 days’ incubation, total CO2–C evolution from soils under meadows was 15.0–16.2 mg g−1 OC averaging over incubation temperatures and soil depths, being 27–55 % greater than that under shrublands. Across all soil samples over two sites, total CO2 − C evolved per g OC at either 18 or 25 °C was closely correlated to enrichments of noncellulosic carbohydrates and microbial biomass. This indicates that the greater soil OC decomposability under meadows was associated with its larger abundances of readily mineralizable fractions compared with shrublands. However, temperature increase effect on soil OC decomposability did not differ between the two types of vegetation.
Conclusions
Our findings suggest that the aspect-vegetation complex significantly affected pool size, biochemical characteristics, and decomposability of soil OC on the northeastern edge of Qinghai-Tibetan Plateau. However, the response of soil OC decomposability to temperature was similar between southward meadows and northward shrublands.
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References
Beck T, Joergensen RG, Kandeler E, Makeschin F, Nuss E, Oberholzer HR, Scheu S (1997) An inter-laboratory comparison of ten different ways of measuring soil microbial biomass C. Soil Biol Biochem 29:1023–1032
Bosatta E, Ågren GI (1999) Soil organic matter quality interpreted thermodynamically. Soil Biol Biochem 31:1889–1891
Brookes PC, Landman A, Pruden G, Jenkinson DS (1985) Chloroform fumigation and the release of soil nitrogen: a rapid direct extraction method to measure microbial biomass nitrogen in soil. Soil Biol Biochem 17:837–842
Chang DHS (1981) The vegetation zonation of the Tibetan Plateau. Mt Res Dev 1:29–48
Chapin FS (2003) Effects of plant traits on ecosystem and regional processes: a conceptual framework for predicting the consequences of global change. Ann Bot Lond 91:455–463
Conant RT, Steinweg JM, Haddix ML, Paul EA, Plante AF, Six J (2008) Experimental warming shows that decomposition temperature sensitivity increases with soil organic matter recalcitrance. Ecology 89:2384–2391
Conant RT, Ryan MG, Ågren GI, Brirge HE, Davidson EA, Eliasson PE, Evans S, Frey SD, Giardina CP, Hopkins FM, Hyvönen R, Kirschbaum MUF, Lavallee JM, Leifeld J, Parton WJ, Steinweg JM, Wallenstein MD, Wetterstedt JÅM, Bradford MA (2011) Temperature and soil organic matter decomposition rates – synthesis of current knowledge and a way forward. Glob Chang Biol 17:3392–3404
Conen F, Leifeld J, Seth B, Alewell C (2006) Warming mineralizes young and old soil carbon equally. Biogeosciences 3:515–519
De Deyn GB, Cornelissen JHC, Bardgett RD (2008) Plant functional traits and soil carbon sequestration in contrasting biomes. Ecol Lett 11:516–531
Del Grosso SJ, Parton WJ, Mosier AR, Holland EA, Pendall E, Schimel DS, Ojima DS (2005) Modeling soil CO2 emissions from ecosystems. Biogeochemistry 73:71–91
Eder E, Spielvogel S, Kölbl A, Albert G, Kögel-Knabner I (2010) Analysis of hydrolysable neutral sugars in mineral soils: improvement of alditol acetylation for gas chromatographic separation and measurement. Org Geochem 41:580–585
Fang C, Smith P, Moncrieff JB, Smith JU (2005) Similar response of labile and resistant soil organic matter pools to changes in temperature. Nature 433:57–59
Fierer N, Craine JM, McLauchlan K, Schimel JP (2005) Litter quality and the temperature sensitivity of decomposition. Ecology 86:320–326
Finzi AC, Canham CD, Breemen NV (1998) Canopy tree-soil interactions within temperate forests: species effects on pH and cations. Ecol Appl 8:447–454
Fissore C, Giardina CP, Kolka RK, Trettin CC, King GM, Jurgensen MF, Barton CD, Mcdowell SD (2008) Temperature and vegetation effects on soil organic carbon quality along a forested mean annual temperature gradient in North America. Glob Chang Biol 14:193–205
Fissore C, Giardina CP, Kolka RK, Trettin CC (2009) Soil organic carbon quality in forested mineral wetlands at different mean annual temperature. Soil Biol Biochem 41:458–466
Gee GW, Bauder JW (1986) Particle-size analysis. In: Klute A (ed) Methods of soil analysis, Part 1, physical and mineralogical methods. Agronomy monograph, vol 9, 2nd edn. American Society of Agronomy Inc, Madison, pp 383–411
Giardina CP, Ryan MG (2000) Evidence that decomposition rates of organic carbon in mineral soil do not vary with temperature. Nature 404:858–861
Giardina CP, Ryan MG, Hubbard RM, Binkley D (2001) Tree species and soil textural controls on carbon and nitrogen mineralization rates. Soil Sci Soc Am J 65:1272–1279
Gregorich EG, Carter MR, Angers DA, Monreal CM, Ellert BH (1994) Towards a minimum data set to assess soil organic matter quality in agricultural soils. Can J Soil Sci 74:367–385
Guggenberger G, Zech W (1999) Soil organic matter composition under primary forest, pasture, and secondary forest succession, Región Huetar Norte, Costa Rica. For Ecol Manag 124:93–104
Guggenberger G, Christensen BT, Zech W (1994) Land use effects on the composition of organic matter in particle-size separates of soil: I. Lignin and carbohydrate signature. Eur J Soil Sci 45:449–458
Harris D, Horwáth WR, van Kessel C (2001) Acid fumigation of soils to remove carbonates prior to total organic carbon or carbon-13 isotopic analysis. Soil Sci Soc Am J 65:1853–1856
Hedges JI, Ertel JR (1982) Characterization of lignin by gas capillary chromatography of cupric oxide oxidation products. Anal Chem 54:174–178
Hibbard KA, Archer SR, Schimel DS, Valentine DW (2001) Biogeochemical changes accompanying woody plant encroachment in a subtropical savanna. Ecology 82:1999–2011
Institute of Soil Science, Academia Sinica (1978) Physical and chemical analytical methods of soil. Shanghai Science Technology Press, Shanghai
Kaye JP, Hart SC (1997) Competition for nitrogen between plants and soil microorganisms. Trends Ecol Evol 12:139–143
Kirschbaum MUF (1995) The temperature dependence of soil organic matter decomposition and the effect of global warming on soil organic C storage. Soil Biol Biochem 27:753–760
Knorr W, Prentice IC, House JI, Holland EA (2005) Long-term sensitivity of soil carbon turnover to warming. Nature 433:298–301
Kögel I (1986) Estimation and decomposition pattern of the lignin component in forest humus layer. Soil Biol Biochem 18:589–594
Kögel-Knabner I (2002) The macromolecular organic composition of plant and microbial residues as inputs to soil organic matter. Soil Biol Biochem 34:139–162
Kögel-Knabner I, Zech W, Hatcher PG (1988) Chemical composition of the organic matter in forest soils: III. The humus layer. J Plant Nutr Soil Sci 151:331–340
Lefèvre R, Barrè P, Moyano FE, Christensen BT, Bardoux G, Eglin T, Houot S, Kätterer T, van Oort F, Chenu C (2014) Higher temperature sensitivity for stable than for labile soil organic carbon – evidence from incubations of long-term bare fallow soils. Glob Chang Biol 20:633–640
Li XG, Li FM, Rengel Z, Zhan ZY, Singh B (2007a) Soil physical properties and their relations to organic carbon pools as affected by land use in an alpine pastureland. Geoderma 139:98–105
Li XG, Li FM, Singh B, Rengel Z, Zhan ZY (2007b) Soil management changes organic carbon pools in alpine pastureland soils. Soil Till Res 93:186–196
Li XG, Rengel Z, Mapfumo E, Bhupinderpal-Singh (2007c) Increase in pH stimulates mineralization of “native” organic carbon and nitrogen in naturally salt-affected sandy soils. Plant Soil 290:269–282
Liao JD, Boutton TW (2008) Soil microbial biomass response to woody plant invasion of grassland. Soil Biol Biochem 40:1207–1216
Luo Y, Wan S, Hui D, Wallace LL (2001) Acclimation of soil respiration to warming in a tall grass prairie. Nature 413:622–625
Luo TX, Shi PL, Luo J, Ouyang H (2002) Distribution patterns of aboveground biomass in Tibetan alpine vegetation transects. Acta Phytoecologica Sin 26:668–676
Marriott EE, Wander M (2006) Qualitative and quantitative differences in particulate organic matter fractions in organic and conventional farming systems. Soil Biol Biochem 38:1527–1536
Melillo JM, Steudler PA, Aber JD, Newkirk K, Lux H, Bowles FP, Catricala C, Magill A, Ahrens T, Morrisseau S (2002) Soil warming and carbon-cycle feedbacks to the climate system. Science 298:2173–2176
Murayama S (1984) Changes in monosaccharide composition during the decomposition of straws under field conditions. Soil Sci Plant Nutr 30:367–381
Nelson DW, Sommers LE (1982) Total carbon, organic carbon and organic matter. In: Page AL, Miller RH, Keeney DR (eds) Methods of soil analysis, Part 2, chemical and microbiological properties. Agronomy monograph, vol 9, 2nd edn. American Society of Agronomy Inc, Madison, pp 539–579
Oades JM (1984) Soil organic matter structural stability: mechnisms and implications for management. Plant Soil 76:319–337
Plante AF, Conant RT, Carlson J, Greenwood R, Shulman JM, Haddix ML, Paul EA (2010) Decomposition temperature sensitivity of isolated soil organic matter fractions. Soil Biol Biochem 42:1991–1996
Song M, Jiang J, Cao G, Xu X (2010) Effects of temperature, glucose and inorganic nitrogen inputs on carbon mineralization in a Tibetan alpine meadow soil. Eur J Soil Biol 46:375–380
Spielvogel S, Prietzel J, Kögel-Knabner I (2007) Changes of lignin phenols and neutral sugars in different soil types of a high-elevation forest ecosystem 25 years after forest dieback. Soil Biol Biochem 39:655–668
Thevenot M, Dignac MF, Rumpel C (2010) Fate of lignins in soils: a review. Soil Biol Biochem 42:1200–1211
Vance ED, Brookes PC, Jenkinson DS (1987) An extraction method for measuring soil microbial biomass C. Soil Biol Biochem 19:703–707
Vanhala P, Karhua K, Tuomi M, Sonninen E, Jungner H, Fritze H, Liski J (2007) Old soil carbon is more temperature sensitive than the young in an agricultural field. Soil Biol Biochem 39:2967–2970
von Lützow M, Leifeld J, Kainz M, Kögel-Knabner I, Munch JC (2002) Indications for soil organic matter quality in soils under different management. Geoderma 105:243–258
Wardle DA (1992) A comparative assessment of factors which influence microbial biomass carbon and nitrogen levels in soil. Biol Rev 67:321–358
Wu RG, Tiessen H (2002) Effect of land use on soil degradation in alpine grassland soil, China. Soil Sci Soc Am J 66:1648–1655
Xu X, Luo Y, Zhou J (2012) Carbon quality and the temperature sensitivity of soil organic carbon decomposition in a tallgrass prairie. Soil Biol Biochem 50:142–148
Yang Y, Fang J, Tang Y, Ji C, Zeng C, He J, Zhu B (2008) Storage, patterns, and controls of soil organic carbon in the Tibetan grasslands. Glob Chang Biol 14:1592–1599
Zak DR, Tilman D, Parmenter RR, Rice CW, Fisher FM, Vose J, Milchunas D, Martin CW (1994) Plant production and soil microorganisms in late-successional ecosystems: a continental-scale study. Ecology 75:2333–2347
Ziegler F, Kögel I, Zech W (1986) Alteration of gymnosperm and angiosperm lignin during decomposition in forest humus layers. J Plant Nutr Soil Sci 153:323–331
Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (41071198), the Priority Program 1372 (Tibetan Plateau: Formation – Climate – Ecosystems) of the German Research Foundation, and the Key International Collaboration Project of the MOST of China (2010DFB63500). We are grateful to Leopold Sauheitl and Ulrike Pieper from the Institute of Soil Science in Hannover for excellent support in the laboratory. We appreciate comments from two anonymous reviewers, which are very constructive for improving the quality of the manuscript.
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Zhao, NN., Guggenberger, G., Shibistova, O. et al. Aspect-vegetation complex effects on biochemical characteristics and decomposability of soil organic carbon on the eastern Qinghai-Tibetan Plateau. Plant Soil 384, 289–301 (2014). https://doi.org/10.1007/s11104-014-2210-x
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DOI: https://doi.org/10.1007/s11104-014-2210-x