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Study of Soil Microbiological Character at Different Altitudes in the Region of Dry and Hot River Valley
In this paper, soils at various altitudes in the lower reaches of the Jinshajiang River, Ningnan County, Sichuan Province, China, were selected to study the variation in characteristics of soil enzymes and soil microbial biomass and their activities at different altitudes. By laboratory testing, statistical analysis and correlation analysis, results indicated that in the dry-hot river valley region, the altitude has a significant impact on the soil microbial characteristics, including soil enzyme activities, microbial biomass, soil basal respiration intensity and substrate-induced respiration intensity (SIR). The major indicators of soil enzymes and microbial biomass exhibit an evident linear increasing trend with the rise in altitude. Soil enzymes and microbial biomass and their activities increase gradually with the reduction in dry-hot wind impact at altitudes ranging from 705-1005 m; thereafter, these indicators tend to be stable as a whole, as the altitude continues to rise and the impact of the dry-hot wind lessens. Under wet-dry cycling conditions, the main soil microbial characteristics, including soil enzyme activities, microbial biomass, soil basal respiration intensity and SIR, display an evident dry-wet seasonal change following a similar law of change; that is, the soil enzymes and microbial biomass and their activities in the dry season are significantly lower than are those in the wet season. The metabolic quotient (qCO2) in the dry season initially falls, then rises and, finally tends to be stable with the rise in altitude, whereas, in the wet season, there is no significant change in qCO2 with altitude. Further analysis shows that soil enzyme indicators, enzyme activities, soil microbial biomass and its activities in both dry and wet seasons have relatively strong correlations with soil physical and chemical properties, and, thus, can act as the indicators for soil fertility assessment. Therefore, the dry-hot wind is one of the major factors that impact soil enzymes and microbial biomass and their activities in the dry-hot river valley region along the Jinshajiang River. Technical measures should be taken, so far as is possible, during the ecological restoration to reduce the stress effects of the dry-hot wind on soil and vegetation and, thus, to promote sustainable development of regional ecological construction.
Keywords
Dry-Hot River Valley, Altitude, Soil Enzyme Activity, Soil Microbial Biomass.
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- Anderson, T.H. and Dormsch, K.H. 1993. The metabolic quotient for CO2 (qCO2) as a specific activity parameter to assess the effects of environmental conditions, such as pH, on the microbial biomass of forest soils. Soil Biology and Biochemistry, 25(3): 393-395.
- Bai, D.J., Pan, Z.X. and Ji, Z.H. 2006. The problem and the countermeasures of ecological environment in Jinsha River dry valley. Territory & Natural Resources Study, 4: 50-51(in Chinese).
- Begon, M., Harper, J.L. and Townsend, C.R. 2000. Ecology: Individuals Populations and Communities (2nd ed.). Boston: Blackwell Scientific Publications.
- Brookes, P.C., Andera, L. and 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 Biol. Biochem., 17(6): 837-842.
- Brookes, P.C. 1995. The use of microbial parameters in monitoring soil pollution by heavy metals. Biol. Fert. Soils, 19: 269-279.
- Chen, S.L., Guo, Z.W. and Yang, Q.P. 2010. Soil enzyme activities in Moso bamboo forests along an altitude gradient. Chinese Journal of Ecology, 29(3): 529-533 (in Chinese).
- Cui, P., Wei, F.Q. and Li, Y. 1999. Sediment transported by debris flow to the lower Jinsha river. International Journal of Sediment Research, 14(4): 67-71.
- Gordon, H., Haygarth, P.M. and Bardgett, R.D. 2008. Drying and rewetting effects on soil microbial community composition and nutrient leaching. Soil Biology and Biochemistry, 40: 302-311.
- Guan, S.Y. 1986. Soil Enzyme and its Research Methods. Beijing: Agriculture Press (in Chinese).
- Hamer, U., Unger, M. and Makeschin, F. 2007. Impact of air-drying and rewetting on PLFA profiles of soil microbial communities. Journal of Plant Nutrition and Soil Science, 170: 259-264.
- He, Q.H., He, Y.H. and Bao, W.K. 2004. Dynamics of soil water contents on south-facing slope of dry valley area in the upper reaches of the Minjiang river. Chinese Journal of Applied and Environmental Biology, 10(1): 068-074 (in Chinese).
- He, Z.L. 1994. Method for measuring soil microbial biomass: Present and future. Progress in Soil Science, 22(4): 36-44 (in Chinese).
- Horwath, W.R. and Paul, E.A. 1994. Microbial biomass. In: Weaver RW, Angle JS, Bottomley PS, (eds.) Methods of Soil Analysis, Part 2 - Microbiological and Biochemical Properties. Madison: American Society of Agronomy.
- Huang, J.H., Bai, Y.F. and Han, X.G. 2001. Effects of species diversity on ecosystem functioning: mechanisms and hypotheses. Chinese Biodiversity, 9(1): 1-7 (in Chinese).
- Huang, J.H. 1994. The spatial pattern of species diversity and its forming mechanism. Chinese Biodiversity, 2(2): 103-107 (in Chinese).
- Institute of Soil Science, Chinese Academy of Sciences, 1985. Methods for Studying Soil Microbial. Beijing: Science Press (in Chinese).
- Iovieno, P. and Baath, E. 2008. Effect of drying and rewetting on bacterial growth rates in soil. FEMS Microbiology Ecology, 65: 400-407.
- Li, C.H., Tang, L.S. and Li, Y. 2007. Effects of air-drying and rewetting on physico-chemical properties and microbial activity of desert grey soil. Acta Pedologica Sinica, 44(2): 364-367 (in Chinese).
- Lu, R.K. 1999. Analytical Methods for Soil and Agrochemistry. Beijing: China Agricultural Science and Technology Press (in Chinese).
- Mariotte, C.A., Hudson, G. and Hamilton, D. 1997. Spatial variability of soil total C and N and their stable isotopes in upland Scottish grassland. Plant Soil, 196: 151-162.
- Mondini, C., Contin, M. and Leita, L. 2002. Response of microbial biomass to air-drying and rewetting in soils and compost. Geoderma, 10: 111-124.
- Powlson, D.S., Brookes, P.C. and Christensen, B.T. 1987. Measurement of soil microbial biomass provides an early indication of changes in total soil organic matter due to straw incorporation. Soil Biology and Biochemistry, 19(2): 159-164.
- Rogers, B.F. and Tate III R.L. 2001. Temporal analysis of the soil microbial community along a top sequence in Pineland soils. Soil Biology and Biochemistry, 33(10): 1389-1401.
- Tang, X.F., Sun, H. and Luo, Y. 2008. The activities of soil urease and neutral phosphatase in the north slope of the Mt. Qomolongma. Chinese Journal of Soil Science, 39(2): 270-273 (in Chinese).
- Wang, B., Liu, G.B. and Xue, S. 2009. Effect of farmland abandonment on soil enzyme activities in Loess region. Acta Agrestia Sinica, 17(3): 282-287 (in Chinese).
- Wu, J. and Brookes, P.C. 2005. The proportional mineralisation of microbial biomass and organic matter caused by air-drying and rewetting of a grassland soil. Soil Biology and Biochemistry, 37: 507-510.
- Xu, G.H. and Zheng, H.Y. 1986. Analytical Handbook of Soil Microbes. Beijing: China Agricultural Press (in Chinese).
- Xu, Q.F., Zheng, X.P. and Yu, W.Z. 1997. Enzymatic activity of forestry soils in Mt. West Tianmu. Jounal of Zhejiang Forestry College, 4(2): 142-146 (in Chinese).
- Yang, W.Q., Gong, A.D. and He, Y.R. 2001. Preliminary investigation on degradation causes and harness approaches of eco-environment in dry and hot valley, Jinsha River-a case from Yuanmou Region. World Scientific and Technological Research and Development, 4: 9-25 (in Chinese).
- Zhang, B., Peng, X.H. and Zhao, Q.G. 2004. Eluviation of dissolved organic carbon under wetting and drying and its influence on water infiltration in degraded soils restored with vegetation. European Journal of Soil Science, 55: 725-737.
- Zhou, L.K. 1987. Soil Enzymology. Beijing: Science Press, 118-159 (in Chinese).
- Zhou, Y., Xu, X.G. and Wang, F. 2009. Soil microbial biomass, respiration, and metabolic quotient along an altitudinal gradient in Wuyi Mountain of southeastern China. Chinese Journal of Ecology, 28(2): 265-269 (in Chinese).
- Zhuang, S.Y., Liu, G.Q., Xu, M.J. and Wang, M.G. 2008. Nitrogen mineralization in forest soils varying in elevation. Acta Pedologica Sinica, 4(6): 1194-1198 (in Chinese).
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