| Research Articles |
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| Land cover changes and the effects of cultivation on soil properties in Shelihu wetland, Horqin Sandy Land, Northern China |
| Jie LIAN1,2, XueYong ZHAO1, XiaoAn ZUO1, ShaoKun WANG1, XinYuan WANG1,2, YongQing LUO1,2 |
1 Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Land cover change plays an essential role in the alternation of soils properties. By field investigation and applying satellite images, land cover information in the Shelihu wetland was carried out in an area of 2,819 hm2 in 1985, 1995, 2000, 2005, 2010 and 2011, respectively, in Horqin Sandy Land. A total of 57 soil sampling sites across Shelihu were chosen in wet meadow (CL0), cropland (CL) and sandy land (SL) according to the spatial characteristics of water body change. Soil texture, organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) contents, electrical conductivity (EC) and pH were measured at the soil depths of 0–10, 10–20 and 20–40 cm to examine the influence of agricultural conversion and continuous cultivation on soil properties. The results showed that the study area was covered by water body in 1985, which gradually declined afterwards and then reclaimed rapidly at a mean annual rate of 132.1 hm2/a from wet meadow to cropland since 1995. In 2011, water body was drained and the area was occupied by 10.8% of CL0, 76.9% of CL and 12.3% of SL. Large amounts of SOC, TN and TP were accumulated in the above depths in CL0. Soil in CL0 also had higher EC and silt and clay fractions, lower pH than in SL and CL. Soil in SL was seriously degraded with lower contents of SOC, TN and TP than in CL and CL0. SOC, TN content and EC in CL decreased with the increase of cultivation age, while pH showed a reverse trend with significance at plough horizon. The agricultural conversion in Shelihu was driven by the comprehensive factors of precipitation reduction, economic development and intense competitions for irrigation water. Continuous cultivation in this process is not sustainable because of SOC degradation and nutrient content reduction. The key point is that conventional tillage and removal of residuals induced further land degradation. Wetland reclamation for immediate economic interests led to greater costs in the long-term environmental restoration in Horqin Sandy Land.
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Received: 29 May 2012
Published: 06 March 2013
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| Fund: The National Natural Science Foun-dation of China (41071185, 41171414) and the National Sci-ence and Technology Support Program (2011BAC07B02). |
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Corresponding Authors:
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| An S Q, Li H, Guan B H, et al. 2007. China's natural wetlands: past problems, current status, and future challenges. Ambio, 36(4): 335–342.Bai J H, Ouyang H, Deng W, et al. 2005. Spatial distribution characteristics of organic matter and total nitrogen of marsh soils in river marginal wetlands. Geoderma, 124(1–2): 181–192.Bernal B, Mitsch W J. 2008. A comparison of soil carbon pools and profiles in wetlands in Costa Rica and Ohio. Ecological Engineering, 34(4): 311–323.Celik I. 2005. Land-use effects on organic matter and physical properties of soil in a southern Mediterranean highland of Turkey. Soil and Tillage Research, 83(2): 270–277.Davidson E A, Janssens I A. 2006. Temperature sensitivity of soil carbon decomposition and feedbacks to climate change. Nature, 440(7081): 165–173.Finlayson C M, Davidson N C, Spiers A G, et al. 1999. Global wetland inventory—current status and future priorities. Marine and Freshwater Research, 50(8): 717–727.Grieve I C. 2001. Human impacts on soil properties and their implications for the sensitivity of soil systems in Scotland. Catena, 42(2–4): 361–374.Hartig E K, Grozev O, Rosenzweig C. 1997. Climate change, agriculture and wetlands in Eastern Europe: vulnerability, adaptation and policy. Climatic Change, 36(1): 107–121.Houghton R A. 2003. Revised estimates of the annual net flux of carbon to the atmosphere from changes in land use and land management 1850–2000. Tellus Series B-Chemical and Physical Meteorology, 55(2): 378–390.ISSCAS (Institute of Soil Sciences, Chinese Academy of Sciences). 1978. Physical and Chemical Analysis Methods of Soils. Shanghai: Shanghai Science Technology Press, 7–59. Juo A S R, Lal R. 1977. The effect of fallow and continuous cultivation on the chemical and physical properties of an Alfisol in western Nigeria. Plant and Soil, 47(3): 567–584.Ladhar S S. 2002. Status of ecological health of wetlands in Punjab, India. Aquatic Ecosystem Health & Management, 5(4): 457–465.Lal R. 2004. Carbon sequestration in dryland ecosystems. Environmental Management, 33(4): 528–544.Lambin E F, Turner B L, Geist H J, et al. 2001. The causes of land-use and land-cover change: moving beyond the myths. Global Environmental Change, 11(4): 261–269. Lian J, Zhao X Y, Zuo X A, et al. 2012. Dynamics of landscape pattern of water areas in Horqin Sandy Land, China. Journal of Desert Research, 32(1): 210–218.Liu J G, Diamond J. 2005. China's environment in a globalizing world. Nature, 435(7046): 1179–1186.Liu X M, Zhao H L, Zhao A F. 1996. Wind-sandy Environment and Vegetation in the Horqin Sandy Land, China. Beijing: Science Press.Maltby E, Immirzi P. 1993. Carbon dynamics in peatlands and other wetland soils regional and global perspectives. Chemosphere, 27(6): 999–1023.Meyer W B, Turner II B L. 1994. Changes in Land Use and Land Cover: A Global Perspective. Cambridge: Cambridge University Press. Moreno-Mateos D, Comín F A, Pedrocchi C, et al. 2008. Effects of wetland construction on nutrient, SOM and salt content in semi-arid zones degraded by intensive agricultural use. Applied Soil Ecology, 40(1): 57–66.Nelson D W, Sommers L E. 1996. Total carbon, organic carbon, and organic matter. In: Sparks D L, Page A L, Helmke P A, et al. Methods of Soil Analysis. Part 3—Chemical Methods. Madison: Soil Science Society of America, 961–1010.Qi Y C, Dong Y S, Peng Q, et al. 2012. Effects of a conversion from grassland to cropland on the different soil organic carbon fractions in Inner Mongolia, China. Journal of Geographical Sciences, 22(2): 315–328.Soil Survey Staff. 1984. A Report of China's Second Soil Survey at the County Level. Soil Survey Office of Naiman County, Inner Mongolia. Turner II B L, Lambin E F, Reenberg A. 2007. The emergence of land change science for global environmental change and sustainability. Proceedings of the National Academy of Sciences, 104(52): 20666–20671.Wang Z M, Huang N, Luo L, et al. 2011a. Shrinkage and fragmentation of marshes in the West Songnen Plain, China, from 1954 to 2008 and its possible causes. International Journal of Applied Earth Observation and Geoinformation, 13(3): 477–486.Wang H, Wang R Q, Yu Y, et al. 2011b. Soil organic carbon of degraded wetlands treated with freshwater in the Yellow River Delta, China. Journal of Environmental Management, 92(10): 2628–2633.Wang Z M, Song K S, Ma W H, et al. 2011c. Loss and fragmentation of marshes in the Sanjiang Plain, Northeast China, 1954–2005. Wetlands, 31(5): 945–954.Watson R T, Noble I R, Bolin B, et al. 2000. Land use, Land-use Change, and Forestry: a Special Report of the Intergovernmental Panel on Climate. Cambridge: Cambridge University Press.Zedler J B, Kercher S. 2005. Wetland resources: status, trends, ecosystem services, and restorability. Annual Review of Environment and Resources, 30(1): 39–74.Zhang J B, Song C C, Wang S M. 2007. Dynamics of soil organic carbon and its fractions after abandonment of cultivated wetlands in Northeast China. Soil and Tillage Research, 96(1–2): 350–360.Zhao H L, Zhao X Y, Zhang T H, et al. 1999. The time-space variation of groundwater and its causes in central desertified area in Naiman Banner of Mongolia in the past 20 years. Journal of Desert Research, 19(Suppl.): 7–11.Zhao X Y, Zhang C M, Zuo X A, et al. 2009a. Challenge to the desertification reversion in Horqin Sandy Land. Chinese Journal of Applied Ecology, 20(7): 1559–1564.Zhao H L, He Y H, Zhou R L, et al. 2009b. Effects of desertification on soil organic C and N content in sandy farmland and grassland of Inner Mongolia. Catena, 77(3): 187–191.Zhao W Z, Xiao H L, Liu Z M, et al. 2005. Soil degradation and restoration as affected by land use change in the semiarid Bashang area, northern China. Catena, 59(2): 173–186.Zhu Z, Chen G. 1994. Sandy Desertification in China. Beijing: Science Press, 7–268. |
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