沙坡头地区猫头刺(Oxytropis aciphylla)根际AM真菌时空分布研究

2007年5月、8月和10月分别从宁夏沙坡头地区的猫头刺根际分5个土层采集土壤样品,系统研究了AM真菌时空分布以及与土壤因子的相关性。结果表明:土层深度对AM真菌定殖率和孢子密度有显著影响,最高定殖率出现在10~30 cm土层,最大孢子密度出现在0~10 cm土层;猫头刺在3个时期均有较高的AM真菌定殖率和孢子密度,AM真菌平均总定殖率为86.98%,孢子密度平均为836.97个/100g土。孢子密度与有机质和碱解氮显著正相关,与速效磷极显著正相关,菌丝定殖率与碱解氮极显著正相关,总定殖率与碱解氮极显著正相关,与pH值显著负相关。蛋白酶活性与泡囊定殖率显著负相关,脲酶活性与菌丝定殖率和总定殖率显著正相关,与孢子密度极显著正相关。

The spatio-temporal distribution of arbuscular mycorrhizal fungi of Oxytropis aciphylla rhizosphere in the area of Shapotou

Soil samples divided by a depth of 50 cm into 5 layers were collected in May,August and October of 2007 in the rhizosphere of Oxytropis aciphylla in Shapotou of Ningxia.The relations of temporal and spatial distribution of AM fungi and soil factors were studied.The results showed that the depth of soil layer affected the AM fungal colonization and spore density significantly.The highest AM fungal colonization occurred in the 10-30 cm layer,the highest spore density existed in the 0-10 cm layer.The better symbiose relation was formed between AM fungi and Oxytropis aciphylla in 3 periods,the average total colonization rate of AM fungi was 86.98% and the average spore density was 836.97/100g soil.Spore density had a significant positive correlation with organic matter and available N and had a very significant positive correlation with available P.Hypha colonization had a very significant positive correlation with available N.The percent colonization had a very significant positive correlation with available N and a significant negative correlation with pH.Soil protease had a significant negative correlation with vesicular colonization.Soil urease had a significant positive correlation with hypha colonization and the percent colonization,and had a very significant positive correlation with spore density.