中文摘要：

为了阐明农牧交错带丛枝菌根真菌（arbuscular mycorrhizal fungi，AMF）的生态作用，于2009年4、7、10月从冀蒙农牧交错带柠条根围0～10、10～20、20～30、30～40、40～50cm5个土层分别采集土壤样品，研究了AMF和球囊霉素的时空分布及其与土壤因子的关系。结果表明，柠条根围AMF和球囊霉素有明显的时空分布，菌丝定殖率和孢子密度在7月份最大，球囊霉素含量在4月份最高；菌丝定殖率、孢子密度和球囊霉素的最大值均出现在0～10cm土层。土壤因子对AMF和球囊霉素的时空分布有显著影响，球囊霉素与菌丝定殖率和孢子密度呈极显著正相关。综上所述，球囊霉素可作为评估土壤AMF活动和土壤肥力的有效指标。

英文摘要：

To elucidate the ecological function of arbuscular mycorrhizal fungi （AMF）,the temporal and spatial dynamics of AMF and glomalin and their relationship with soil factors were surveyed in farming-pastoral zone in Hebei province and Inner Mongolia. Soil samples in the rhizosphere of Caragana korshinskii Kom. were collected at 0- 10,10 - 20,20- 30,30- 40 and 40 - 50 cm depth in April,July and October of 2009,respectively. The results showed that AMF and glomalin in the rhizosphere of C. korshinskii had significant spatio-temporal distribution, hyphal colonization and spore density had the highest values in July, glomalin had maximal value in April,hyphal colonization, spore density and glomalin were the highest at 0-10 cm soil layer. Spatio-temporal distribution of AMF and glomalin was significantly affected by soil factors, and gloraalin had positive relationship with hyphal colonization and spore density. Therefore,glomalin may be an appropriate index for evaluating AMF activities and soil fertility.