毛乌素沙地樟子松人工林土壤微生物数量变化  

Changes of soil microorganism of artificial Pinus sylvestris var. mongolica in Mu Us sandland

作　　者：李陆平[1,2] 廖超英[1,2] 李晓明[1,2] 孙长忠[3] 段民富[1,2] 杨晓娟[1,2] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]农业部黄土高原农业资源和环境修复重点开放实验室,陕西杨凌712100 [3]中国林业科学研究院华北林业实验中心,北京102300

出　　处：《干旱地区农业研究》2013年第1期157-160,共4页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金项目(30670339)

摘　　要：对毛乌素沙地榆林沙区樟子松人工固沙林地土壤微生物进行测定和分析,结果表明：不同林龄樟子松林地细菌、放线菌和真菌数量差异显著,细菌和真菌数量随林龄增大不断增加;放线菌数量在流沙地（CK）、7~23a生林地这一时期内随着林龄增大显著增加,23 a生林地达到最大值,31 a生林地出现明显回落。三大微生物均随土层深度加深而减少,在沙丘部位的分布表现为：丘间地〉背风坡〉迎风坡〉丘顶。在流沙地上栽植樟子松人工林后,土壤微生物数量增加,土壤肥力水平提高。Soil microorganism of artificial Pinus sylvestris var. mongolica in Mu Us sandland were measured. The results showed that： soil bacteria, soil actinomycetes and soil fungi of different plantation ages of artificial Pinus sylvestris var. mongolica were different, soil bacteria and soil fungi increased as the plantation age went by; soil actinomycetes rose significantly during the CK, 7 ~ 23 year period, and it peaked at the 23rd year and dropped apparently at the 31rd year. The three types of microorganism decreased as the soil depth deepened, and the distribution of them in different dune parts presented as： interdune land 〉 leeward slope 〉 windward slope 〉 dune tops. After artificial Pinus sylvestris var. mongolica was established on the wind-drift sand, the number of soil microorganism rised, soil fertility level was in- Creased.

关 键 词：土壤微生物 樟子松固沙林 毛乌素沙地 榆林沙区 

分 类 号：S154.3[农业科学—土壤学]