树莓根际AM真菌分布和定殖

2004年7~12月在关中盆地西部,每月分别从0~10、10~20、20~30和30~40 cm 4个土层采集树莓根际土样,系统研究树莓根际AM真菌时空分布和土壤因子之间的相关性。结果表明,树莓能与AM真菌形成良好的共生关系。AM真菌的最高定殖率并不伴随有最大孢子密度,最高定殖率发生在9月,达86%,而最大孢子密度出现在11月,平均密度为14个/g土。土壤碱解氮与孢子密度呈极显著负相关,土壤有机质与孢子密度呈显著负相关,土壤pH与菌丝定殖率呈显著负相关,与泡囊定殖率呈极显著负相关。在检测和评估土壤生态状况和植物形成菌根的能力等方面,宿主植物根际AM真菌的孢子密度和AM真菌不同结构的定殖程度是十分有用的指标。

Temporal and spatial distribution and colonization of AM fungi round the rhizosphere of raspberry

Soil samples from the 0-10 cm, 10-20 cm,20-30 cm and 30--40 cm depths were collected monthly between July and December 2004, the correlation of temporal and spatial distribution of colonization of AM fungi round the rhizosphere of Raspberry to soil factors was analyzed. The result indicates that the good symbiosis between AM fungi and raspberry was formed. AM fungal colonization and spore density was used to assess and compare the responses of AM fungi to soil condition. The mean percent colonization and spore density of AM fungi reached maximal values of 86% in September and 130 pre lg soil in November 2004, respectively. Soil alkali solution N had a significant negative effect on spore density, and soil organic matter presented negative correlation to spore density. Soil pH had a negative effect on hyphae percent colonization, and a significant negative effect on vesicle percent colonization. This study results suggest that spore density round the rhizosphere of host-plants and the different structures of AM fungi are the useful indicators for evaluating changes in soil ecosystems.