摘要
对陕西省延安、绥德、横山和榆林4个自然生境下柠条根际AM真菌空间分布和土壤成分进行测定分析。结果表明,AM真菌泡囊定殖率及孢子密度与样地生态条件密切相关,泡囊定殖率和孢子密度在绥德最高,丛枝定殖率在榆林最高。采样深度对孢子密度有显著影响,最大孢子密度发生在10～20cm土层,而AM真菌定殖率在0～10cm或20～30cm土层有最大值。孢子密度与泡囊定殖率呈正相关,与丛枝定殖率呈负相关。孢子密度与土壤有机质、速效磷、速效钾和Cl-含量呈负相关,泡囊定殖率与土壤pH呈正相关,而与土壤湿度、速效钾和Cl-含量呈负相关。土样中AM真菌多为球囊霉属(Glomus)种类,也有少数无梗囊霉属(Acaulospora)和巨孢囊霉属(Scutellospora)种类。建议孢子密度和泡囊定殖率可作为检测土壤环境状况的指标。
Spatial distributions of arbuscular mycorrhizal fungi in the rhizosphere of Caragana korshinskii and its relativity to soil factors were investigated in four natural environments of Yah＇an, Suide, Hengshan and Yulin in Shaanxi Province. The results show that sampling sites have significant effects on the percentages of colonization of vesicle and arbuscule and the spore density of AM fungi. The highest value of vesicular colonization and spore density are in Suide,and the highest arbuscular colonization is in Yulin. Sampling depth of soil significantly affects the spore density in four sites, the highest spore density appears in 10 - 20cm soil layer; the highest percentage of colonization of AM fungi occurs at 0 - 10cm or 20 ～ 30cm soil layer. Spore density is positively correlated with vesicular colonization and negatively correlated with arbuscular colonization. Spore density is also negatively correlated with the contents of soil organic matter, soil available P, soil available K and soil Cl^- . Vesicular colonization has a positive correlation to soil pH and a negative correlation to the contents of soil moisture,soil available K and soil Cl^- . Most of AM fungi in the samples belong to Glomus ,but a few of species belong to Acaulospora and Scutellospora. The results suggest that the spore density and the extent of vesicular colonization are useful indicators for evaluating the changes of soil environmental ecosystems.
出处
《中国生态农业学报》
CAS
CSCD
2007年第2期81-84,共4页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金(40471637)
教育部留学回国人员科研启动基金项目(141101)资助
