段小圆,贺学礼.毛乌素沙地花棒(Hedysarum scoparium)根围AM真菌生态学研究[J].干旱地区农业研究,2008,(5):234~238
毛乌素沙地花棒(Hedysarum scoparium)根围AM真菌生态学研究
Ecological research on Arbuscular mycorrhizal fungi from the rhizosphere of Hedysarum scoparium in MuUs sandland
  
DOI:10.7606/j.issn.1000-7601.2008.05.47
中文关键词:  AM真菌  土壤酶  时空分布  花棒
英文关键词:AM fungi  soil enzyme  spatial-temporal distribution  Hedysarum scoparium
基金项目:国家自然科学基金项目(40471637)
作者单位
段小圆 西北农林科技大学生命科学学院 陕西 杨凌 712100 
贺学礼 西北农林科技大学生命科学学院 陕西 杨凌 712100河北大学生命科学学院 河北 保定  071002 
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中文摘要:
      2007年5月、8月和10月在鄂尔多斯沙地草地生态研究站定点采集花棒(Hedysarum scoparium)根围土样,系统研究了AM真菌的时空异质性及其与土壤因子的关系。结果表明:花棒能与AM真菌形成良好的共生关系。菌根类型为I-型;AM真菌孢子密度随土壤深度增加而下降,最大孢子密度出现在10月份的0~10 cm土层,最大定殖率出现在10月份10~20 cm土层;孢子密度与泡囊定殖率呈极显著正相关;土壤有机质、速效氮和脲酶活性均与孢子密度呈极显著正相关,与菌丝定殖率、泡囊定殖率和总定殖率呈显著正相关;pH值与丛枝定殖率、菌丝定殖率和总定殖率呈极显著负相关;蛋白酶活性与丛枝定殖率呈显著正相关。AM真菌与土壤因子的高相关性,说明丛枝菌根不同结构定殖程度和孢子密度可作为沙生土壤环境状况评估的有效指标。
英文摘要:
      The samples of soil and root in the rhizospheres of the Hedysarum scoparium were collected from the Ordos Sandland and Grassland Ecological Institute in May、August and October 2007. The spatial-temporal distribution of AMF and its relation to soil factors were investigated and analyzed. The result showed that a good symbioses relation is formed between AM fungi and Hedysarum scoparium. Mycorrhizal type is intermediate type; The spore density of AMF has a decreasing change with the increase of the depth of soil samples, and the highest spore density occurs in 0~10 cm soil layer in October, and the highest percentage of colonization occurs in 10~20 cm soil layer in October; The Spore density has a significantly positive correlation with vesicular colonization rate; soil organic matter, alkali solution N and urease activity have a significantly positive correlation with Spore density, moreover they are positively correlated with vesicular colonization rate, total and hypha colonization rate; pH has a significantly negative effect on the arbuscular colonization rate, total and hypha colonization rate; Protease activity has a significantly positive affected on the arbuscular colonization rate. The relations between AMF and soil factors prove the diverse colonization of different structures of AMF and the spore density can be used as effective evaluations for sandland soil environment.
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