BIOLOGICAL MECHANISM OF SANDY DESERTIFICATION IN GRASSLAND RECLAMATION AREA IN NORTH CHINA
Received date: 2002-05-14
Revised date: 2002-10-30
Online published: 2003-04-01
Grassland comprises an important part of land resource in North China. In recent decades, grassland desertification is more and more serious and becomes one of the most serious environmental and social-economic problems in North China. Thus, a better understanding on the biological mechanism of grassland desertification is required for combating grassland desertification and for appropriate management and conservation of environment. We exploited the results of desertification research obtained from Bashang area as a typical district of slight to moderate desertification area and Korqin sandy land as the typical of severe desertification district, respectively, in combination with previous relevant research achievements, to alleviate the biological mechanism of grassland desertification. It is illustrated that desertification results in invasion of shrub which is adapted to desert environment, and thus, increase of spatial heterogeneity in soil resource and mycorrhizae. It was pointed out that shrub invasion occurs during the process of conversion of farmland to grassland and overgrazing. Shrub invasion into grassland facilitate the development of “islands of soil resource” with soil nutrients and moisture accumulated under shrub canopy. Meanwhile, the occurrence of shifting sand patches accelerated soil erosion by wind and water. Improper cultivation, irrigation,saltanization, as well as overgrazing reduce the density and inoculation rate and decrease grassland productivity. Spatial heterogeneity of soil resource and landscape on sandy land enhance with the shrub establishment and development. It is proposed that soil particle fractal characteristics could be used as an indicator of desertification, and variation coefficient as reflected by ratio of variation to average, could be used as an index of heterogeneity of soil resources.
Zhao Wenzhi,He Zhibin,Li Zhigang . BIOLOGICAL MECHANISM OF SANDY DESERTIFICATION IN GRASSLAND RECLAMATION AREA IN NORTH CHINA[J]. Advances in Earth Science, 2003 , 18(2) : 257 -262 . DOI: 10.11867/j.issn.1001-8166.2003.02.0257
[1] Schlesinger W H,Reynolds J F,Cunningham G L,et al. Biological feedbacks in global desertification[J]. Science,1990,247:1 043-1 048.
[2] Allen M F. Mycorrhizae and rehabilitation of disturbed arid soils:Processes and practices[J]. Arid Soil Research,1989,3:229-241.
[3] CCICCD. China Country Paper to Combat Desertification [M].Beijing: China Forestry Publication House,1996. 18-31.
[4] Dong Guangrong, Wu Bo, Ci LongJun, et al. Present situation, cause and control way of desertification in China[J]. Journal of Desert Research, 1999, 19（4）:318-332. [董光荣,吴波,慈龙骏,等. 我国荒漠化现状、成因及防治对策[J].中国沙漠,1999,19（4）:318-332.]
[5] Xiao Honglang, Zhao Xue, Zhao Wenzhi.Study on UAP-USTIC Isohumisol degradation under farming in Hebei, China[J]. Acta Pedologica Sinica, 1998, 35（2）:129-134.[肖洪浪,赵雪,赵文智.河北坝缘简育干润均腐质土耕种过程的退化研究[J].土壤学报,1998,35（2）:129-134].
[6] Matson P A,Parton W J,Power A G,et al. Agricultural intensification and ecosystem properties[J]. Science,1997,277:504-508.
[7] Mandelbrot B B. The Fractal Geometry of Nature[M].San Francisco: W H Freeman,1982.45-256.
[8] Turcotte D L. Fractal fragmentation[J]. Journal of Geographysical Research,1986,91（12）:1 921-1 926.
[9] Yang Peiling, Luo Yuanpei, Shi Yuanchun. Use of particle-size weight distribution to characterize soil fractal feature [J]. Chinese Science Bulletin, 1993,38(20): 1 896-1 899.[杨培岭,罗远培,石元春.用粒径的重量分布表征的土壤分形特征[J].科学通报,1993,38（20）:1 896-1 899.]
[10] Zhao Wenzhi, Liu Zhimin, Cheng Guodong. Fractal dimension of soil particle for sandy desertification[J]. Acta Pedologica Sinica,2002,39(6): 877-881.[赵文智,刘志民,程国栋. 土地沙漠化过程中的土壤颗粒分形特征[J]. 土壤学报,2002, 39(6):877-881.]
[11] Zhu Z D, Chen GT. Land Desertification in China [M]. Beijing: Science Press, 1994. 157-179.[朱震达,陈广庭.中国土地沙质荒漠化[M].北京:科学出版社,1994.157-179.]
[12] Schlesinger W H,Raikes J A,Hartley A E,et al. On the spatial pattern of soil nutrients in desert ecosystems[J]. Ecology,1996,77（2）:364-374.
[13] Alpert P, Mooney H A. Resource heterogeneity generated by shrubs and topography on coastal sand dune[J]. Vegetation, 1988,122:83-93.
[14] Allen M F, MacMahon J A. Impact of disturbance of cold desert fungi: Comparative microscale dispersion patterns[J]. Pedobiologia, 1985,28:215-224.
[15] Dunkerley D. Hydrologicac effects of dryland shrubs: Defining the spatial extent of modified soil water uptake rates at an Australian desert site[J]. Journal of Arid Environments, 2000,45:159-172.
[16] Wezel A, RaJot J L, Herbrig. Influence of shrubs on soil characteristics and their function in Sahelian agr-ecosystems in semi-arid Niger[J]. Journal of Arid Environments, 2000,44:383-398.
[17] Zhao Wenzhi, Zhao Cunyu. Study on the soil habitat features of Artemisia intramongolica and Artemisia frigida in desertified land in Bashang region of Hebei Province [J]. Journal of Desert Research, 1994,14(4):22-28. [赵文智,赵存玉.河北坝上沙漠化土地褐沙蒿、冷蒿土壤生境特征研究[J]. 中国沙漠,1994,14（4）:23-28.]
[18] Wang Tao,Zhao Halin,Xiao Honglang. Advances in desertification research of China[J]. Journal of Desert Research, 1999,19（4）:299-311.[王涛,赵哈林,肖洪浪.中国沙漠化研究的进展[J].中国沙漠,1999,19（4）:299-311.]
[19] De Soyza A G, Whitford W G, Herrick J E W, et al. Early warning indicators of desertification:Examples of tests in the chihuahuan desert[J]. Journal of Arid Environments, 1998,39:101-112.
[20] Allen MF. Belowground spatial pattering: Influence of root architecture, microorganism and nutrients on plant survival in arid lands[A]. In: Allen E B, ed. The Reconstruction of Disturbed Arid Ecosystems[C]. Boulder, Colorado: Westview Press, 1988.113-135.
[21] Hayman D S. Effects of soil and fertility on activity and survival of vesicular-arbuscular mycorrhizal fungi[J]. Phytopathology, 1982,72:1 119-1 125.
[22] Menge J A. Effects of soil fumigants and fungicides on vesicular-arbuscular fungi[J]. Phytopathology, 1982,72:1 125-1 132.
[23] Allen M F, John T V. Dual culture of endomycorrhizae[A]. In:Schenck NC ed. Methods and Principles of Mycorrhizal Research[C]. St Paul, Minnesota: American Phytopathological Society, 1982.85-90.
[24] Hirrel M C. The effect of sodium and chloride salts on the germination of Gigaspora margarita[J]. Mycologia, 1981,73:610-617.
[25] Hirrel M C, Gerdemann J W. Improved growth of onion and bell pepper in saline soils by two vesicular-arbuscular mycorrhizal fungi[J]. Proceeding of the Soil Society of America, 1980,44:654-655.
[26] Allen M F, Boosalis M G. Effects of two species of VA mycorrhizal fungi on drought tolerance of winter wheat[J]. New Phytologist, 1983,93:67-76.
[27] Trappe J M. Mycorrhizae and productivity of arid and semi-arid rangelands[A]. In: Manassah J T, Briskey E J, eds. Advances in Food Producing Systems for Arid and Semi-arid Lands[C]. New York: Academic Press, 1981.581-599.
[28] Wallace L L. Growth, morphology and gas exchanges of mycorrhizal and nonmycirrhizal Pannicum coloratum L, a C4 grass species,under different clipping and fertilization regimes[J]. Oecologia, 1981, 49:272-278.
[29] Reece P E, Bonham C D. Frequency of endomycorrhizal inJection in grazed and ungrazed bluegrama plants[J]. Journal of Range Management, 1978,31:149-151.
[30] Bethlenfalvay G J, Evans R A, Lesperance A L. Mycorrhizal colonization of crested wheatgrass as influenced by grazing[J]. Agronomy Journal, 1985,77:233-236.
[31] Bethlenfalvay G J, Brown J S, Pacovski. Parasitics and mutualistic associations between a mycorrhizal fungus and soybean; development of a host plant[J]. Phytopathology, 1982,72:889-893.
[32] Wallace L L. Effects of clipping and soil compaction on growth,morphology and mycorrhizal colonization of Schzachyrium scoparium, a C4 bunchgrass[J]. Oecologia, 1987,72:423-428.
[33] Chang Xueli, Wu Jianguo. Spatial analysis of pattern of sandy landscapes in Kerqin,Inner Mongolia[J]. Acta Ecologica Sinaca, 1998,18（3）:225-232. [常学礼,邬建国.科尔沁沙地景观格局特征分析[J].生态学报,1998,18（3）
:225-232.]
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