论文部分内容阅读
AM真菌是一类广泛分布的土壤真菌 ,与宿主植物形成共生结构后 ,对于植物生长和植被恢复有多种有益的生理学和生态学作用。 1 999年 1 1月至 2 0 0 0年 1 0月 ,通过每月分别从 0～ 1 0 cm和 1 0～ 2 0 cm土层采集根际土样 ,对以色列荒漠地区丛枝霸王 (Zygophyllumdumosum Boiss)根际 AM真菌进行了系统的生态学研究。AM真菌的分布和定殖与季节变化和采样深度密切相关。菌根真菌的最高定殖率并不伴随有最大的孢子密度 ,最高的定殖率发生在 1 999年 1 1月 ,而最大的孢子密度则出现在 2 0 0 0年 9月。 1 0～ 2 0 cm土层中的菌根真菌定殖率和孢子密度明显高于 0～ 1 0 cm土层。土壤湿度与所有菌根结构的定殖率呈正相关 ,土壤有机质含量与泡囊和丛枝定殖率呈正相关 ,而土壤总可溶性氮对泡囊和丛枝定殖有显著正效应 ,对孢子密度有显著负效应。结果建议 ,孢子密度、泡囊和丛枝定殖程度可作为检测荒漠土壤状况的生态指标。研究应用于我国特别是西部荒漠地区的植被建立和恢复 ,可望发挥重要作用 :(1 ) AM真菌能与绝大多数高等植物根系形成共生联合体 ,促进根系对土壤矿质营养和水分的吸收 ,提高植物对干旱、高温、盐碱、根部病害等的抗性 ,提高逆境条件下植物的成活率 ,深入研究荒漠生态系统中 AM真菌动态分布 ,以?
AM fungi are a group of widely distributed soil fungi that, after forming symbiotic structures with host plants, have a number of beneficial physiological and ecological effects on plant growth and vegetation recovery. From January 1999 to January 2010, rhizosphere soil samples were collected from 0 ~ 10 cm and 10 ~ 20 cm soil layers every month respectively, and soil samples from Zygophyllum dumosum Boiss rhizosphere AM fungi were systematically studied in ecology. The distribution and colonization of AM fungi are closely related to the seasonal variation and sampling depth. The highest colonization rate of mycorrhizal fungi is not associated with the largest spore density, the highest colonization rate occurred in January 1999 January, and the largest spore density appeared in September 2000. The colonization rate and spore density of mycorrhizal fungi in 0 ~ 20 cm soil layer were significantly higher than those in 0 ~ 100 cm soil layer. Soil moisture had a positive correlation with the colonization rate of all mycorrhizal structures. Soil organic matter content was positively correlated with the colonization rate of vesicles and shoots, while total soluble nitrogen had a significant positive effect on the growth of vesicles and shoots. Have a significant negative effect. The results suggested that the density of spores, the degree of vesicle and shrub colonization can be used as ecological indicators to detect desert soil conditions. It is expected to play an important role in the establishment and restoration of vegetation in China, especially in the desert regions of western China. (1) AM fungi can form symbiotic association with the root of most higher plants and promote the uptake of soil mineral nutrition and water by roots, Improve plant resistance to drought, high temperature, saline-alkali, root disease and other diseases, improve the survival rate of plants under adverse conditions, in-depth study of the dynamic distribution of AM fungi in desert ecosystems,