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环境因子对西藏高原草地植物丛枝菌根真菌的影响
引用本文:蔡晓布,钱成,彭岳林,冯固,盖京平.环境因子对西藏高原草地植物丛枝菌根真菌的影响[J].应用生态学报,2005,16(5):859-864.
作者姓名:蔡晓布  钱成  彭岳林  冯固  盖京平
作者单位:1. 西藏农牧学院农学系,林芝,860000
2. 中国农业大学资源与环境学院,北京,100094
基金项目:国家自然科学基金项目(30260055),西藏自治区科技厅重点科技资助项目(200410).
摘    要:对西藏高原不同草地类型建群种植物的研究结果表明,寄主植物根围土壤AM真菌孢子密度与菌根侵染率之间无相关性;不同海拔条件下温度、降水量等的显著变化对草地植物AM真菌的发育和侵染具有重要影响,不同草地类型、土壤质地对AM真菌的影响亦较明显;在一定范围内,孢子密度随土壤pH、有机质含量的提高分别呈显著增加(r=0.5319*,n=20)和下降趋势(r=-0.1973,n=20),菌根侵染率与土壤pH、有机质含量间则分别呈一定程度的负相关和正相关;高磷土壤环境对AM真菌的产孢和侵染均具有不同程度的抑制作用;最适AM真菌发育和产孢的土壤pH、有机质和有效磷含量范围分别为8.0~8.7、3.8~4.8 g·kg和7.8~10.1 mg·kg-1;中度特别是重度退化草地对AM真菌的繁殖和侵染均具有不利影响,适度放牧对AM真菌关键种的保持具有重要意义;AM真菌对沙生苔草、矮生嵩草和扁穗莎草根系均具有良好的侵染效应.

关 键 词:AM真菌  草地植物  环境因子  西藏高原
文章编号:1001-9332(2005)05-0859-06
收稿时间:2004-06-28
修稿时间:2004年6月28日

Effects of environmental factors on AM fungi around steppe plant roots in Tibet Plateau
CAI Xiaobu,QIAN Cheng,PENG Yuelin,FENG Gu,GAI Jingping.Effects of environmental factors on AM fungi around steppe plant roots in Tibet Plateau[J].Chinese Journal of Applied Ecology,2005,16(5):859-864.
Authors:CAI Xiaobu  QIAN Cheng  PENG Yuelin  FENG Gu  GAI Jingping
Institution:Department of Agriculture, Tibet Agricultural and Animal Husbandry College, Linzhi 860000, China. caitw21@sohu.com
Abstract:The study on the representative steppe plant species in Tibet Plateau showed that the density of AM fungi spores in host plant rhizosphere did not correlate with the infection rate of AM fungi. The big changes in air temperature and rainfall at different altitudes played an important role in determining the growth and infection of AM fungi specific to steppe plants, and steppe type and soil texture also had obvious effects on AM fungi's growth and infection. Within a certain range, the spore density increased significantly with increasing soil pH (r = 0.5319, n = 20), but showed a declining trend with the improvement of soil organic matter (r = - 0.1973, n = 20). In contrast, the infection rates of AM fungi to host plants were to some extent negatively and positively correlated with soil pH and soil organic matter, respectively. Phosphorus (P) enrichment in soil environment led to the inhibition of the reproduction and infection of AM fungi. The suitable soil pH, OM and Olsen P contents for the growth and reproduction of AM fungi ranged from 8.0-8.7, 3.8-4.8 g.kg(-l) and 7.8-10.1 mg.kg(-1), respectively. Moderate and serious degradation of steppe (especially the serious degradation) had negative or detrimental impacts on the reproduction and infection of AM fungi. Reasonable grazing was helpful to the conservation of critical species of AM fungi. AM fungi also showed a relatively high infection rate on the roots of sedge species such as Carex praecpara, Kobresia humilis and Cyperus compressus.
Keywords:Arbuscular mycorrhizal fungi  Steppe plants  Environmental factors  Tibet Plateau  
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