凋落物配比对杉木土壤微生物碳代谢多样性的影响

发布时间：2018-08-22 14:22

【摘要】：在4、15和32年生杉木人工林内采用网袋法布设不同配比杉木-火力楠凋落物网袋和空白对照样地,采用Biolog技术分析不同林龄杉木人工林内凋落物配比对表层(0~5 cm)土壤微生物的碳源利用以及土壤微生物碳代谢多样性的影响。结果表明,各林分土壤微生物平均颜色变化率(AWCD)表现为32 a15 a4 a;杉木-火力楠1∶2处理下4年生幼林表层土壤中整体代谢活性最强。3个林分土壤微生物的丰富度(Shannon指数)以及多样性(Simpson指数)差异较小,杉木-火力楠1∶2处理对土壤微生物的均一度(Mc Intosh指数)影响达极显著水平(P=0.001)。3个林分都以碳水化合物、氨基酸以及聚合物作为主要的碳源利用类型,其中4、15和32年生杉木人工林中杉木-火力楠2∶1、纯杉木处理下的土壤微生物对碳源的利用聚为一类,杉木-火力楠1∶2、杉木-火力楠1∶1与纯火力楠处理在15、32年生杉木人工林中聚为一类。
[Abstract]:In the plantation of Chinese fir (Cunninghamia lanceolata) at the age of 415 and 32 years old, the net bag with different proportions was set up by using the net bag method, and the net bag of the litter and the blank match were set up in the same way. Biolog technique was used to analyze the effects of litter ratio on the carbon source utilization and microbial carbon metabolism diversity in the surface layer (0 ~ 5 cm) of Cunninghamia lanceolata plantation at different ages. The results show that The average color change rate of soil microorganism in each stand was 32 a 15 a 4 a, and the metabolic activity of surface soil was the highest under 1:2 treatment of Cunninghamia lanceolata. The soil microbial richness (Shannon index) of the three stands was the highest. And the diversity (Simpson index) is small, The average (Mc Intosh index of soil microorganism treated with 1:2 treatment of Cunninghamia lanceolata was significant (P0. 001). Carbohydrate, amino acid and polymer were the main carbon source types in the three stands. Among them, Cunninghamia lanceolata (Cunninghamia lanceolata) and Cunninghamia lanceolata (Cunninghamia lanceolata) were planted in 415 and 32 years old Chinese fir plantations. Cunninghamia lanceolata (Cunninghamia lanceolata), Cunninghamia lanceolata (Cunninghamia lanceolata), Cunninghamia lanceolata (Cunninghamia lanceolata),
【作者单位】：福建农林大学资源与环境学院;国家林业局杉木工程技术研究中心;福建农林大学林学院;福建省上杭白砂国有林场;邵武市林业科学技术推广中心;
【基金】：“十三五”国家重点研发计划项目(2016YFD0600301) 国家自然科学基金项目(31270676)
【分类号】：S714

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