巨桉人工林不同林龄阶段土壤微生物多样性特征  

Soil Microbial Biodiversity across a Range of Eucalyptus grandis Plantation Ages

作　　者：陈礼清[1] 张丹桔[1] 张健[1] 

机构地区：[1]四川农业大学生态林业研究所,生态林业工程省级重点实验室,四川温江611130

出　　处：《四川农业大学学报》2011年第4期472-476,共5页Journal of Sichuan Agricultural University

基　　金：国家科技支撑计划课题(2011BAC09B05);国家自然科学基金项目(30872014)

摘　　要：为了解巨桉人工林对土壤生态过程的影响,研究了1～10a生巨桉人工林林下土壤微生物数量及其生物量。结果显示,土壤细菌在土壤微生物类群中占绝对优势,放线菌次之、真菌数量最低,土壤细菌、放线菌、真菌、及微生物总数随土层加深而降低,偶尔出现逆向分布;各微生物类群及微生物数量呈现1～4a降低,而后显著增加。土壤微生物多样性指数,Pielou和Shannon-wiener指数轮伐期前(1～3或4a)有波动的增加,而后随林龄逐渐减小;Simpson指数呈相反趋势。In order to clearly understand the effects of eucalypt （Eucalyptus grandis） on soil eco- logical processes, soil microbial counts and microbial biomass were investigated in the Eucalyptus grandis plantations with a range of ages from 1 to 10 years. Bacteria quantitatively dominated the soil microbe community in eucalypt plantations regardless of plantation ages, followed by actino- mycete and fungi. Microbial counts decreased with soil depths except for the converse distribution in certain stands. The microbial counts decreased in eucalypt plantations from 1 to 4 years, and then increased with the increase of plantation age. Shannon-wiener index and Pielou index in- creased in the first 3 or 4 years and then decrease with the increase of plantation age, but Simpson index showed an opposite trend.

关 键 词：巨桉人工林 年龄系列 土壤微生物数量 生物多样性 

分 类 号：S718.521.3[农业科学—林学] S792.39