冬季火对川西亚高山草地土壤微生物功能多样性及其强度的短期影响  

Short-term effects of a winter wildfire on diversity and intensity of soil microbial function in the subalpine grassland of western Sichuan, China

作　　者：王谢[1] 向成华[1,2] 李贤伟[1] 文冬菊[1] 

机构地区：[1]四川农业大学林学院,四川雅安625014 [2]四川省林业科学研究院森林生态与资源环境研究所,成都610081

出　　处：《植物生态学报》2014年第5期468-476,共9页Chinese Journal of Plant Ecology

基　　金："十二五"农村领域国家科技计划子课题(2011BAD38B0204);"十二五"科技支撑项目(2011BAC09B05)

摘　　要：为可持续管理川西亚高山草地生态系统,全面地了解火后土壤微生物功能的多样性和强度的变化及其恢复状况,基于2010年"12·5"冬草场的火烧事件,以川西亚高山草地为研究对象,对比了火烧和未火烧区域0–20 cm土层土壤中7种酶(β-葡糖苷酶、酸性磷酸酶、碱性磷酸酶、脲酶、蔗糖酶、蛋白酶和过氧化氢酶)的活性变化,分析了土壤微生物功能多样性及其强度对火处理的响应。结果发现,7种酶的潜在活性在0–5 cm土层中皆有所增加,但对火处理、土层深度和两者交互作用的响应有所差异;其中,碱性磷酸酶在指示该区域火后微生物功能多样性和强度短期内的变化时具有较好的灵敏性和指示性。火在一定程度上促进了表土层微生物功能的发挥,但是土壤微生物功能多样性及其强度对火和土层深度(0–20 cm)的响应并不显著。因此,为能更好地揭示干扰行为对微生物生物多样性的影响机制,未来应加强土壤微生物群落功能稳定性的研究。Aims For sustainably managing the subalpine grassland of western Sichuan, a post-fire recovery in diversity and intensity of soil microbial function was studied. Methods The activities of seven soil enzymes, includingβ-glucosidase, acid phosphatase, alkaline phosphatase, urease, sucrase, protease, catalase, and fluorescein diacetate hydrolase, were measured on soil samples collected from burned and unburned sites in the study area following a wildfire on 5 December 2010. The diversity and in-tensity of soil microbial function were estimated by the methods of Bending and Perucci. Important findings In this study, we found that the activities of the seven soil enzymes in the 0-5 cm soil layer were all increased significantly by the fire, but the responses to fire and soil depth varied among different soil en-zymes. The alkaline phosphatase appeared to be a good indicator of the short-term responses in the diversity and intensity of soil microbial function to fire in this area. On the whole, although fire enhanced the surface soil mi-crobial function to some extent, the diversity and intensity of soil microbial function were not significantly af-fected by the fire in the 0-20 cm soil layer. Future research on the functional stability of soil microbial community could better reveal the underlying mechanisms of the impact of disturbance on soil microbial biodiversity.

关 键 词：多样性 酶活性 微生物功能 亚高山草地 冬季火烧 

分 类 号：S812.29[农业科学—草业科学]