火烧对退耕还湿土壤微生物活性的影响  

Influence of Fire on Soil Microbial Activity of Restoration Marsh

作　　者：杨桂生[1] 宋长春 郭跃东[1] 路永正[1] 宋艳宇[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所中国科学院湿地生态与环境重点实验室,长春130012

出　　处：《水土保持学报》2010年第6期218-221,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学重点基金项目(40930527);国家重点基础研究发展规划(973)项目(2009CB421103);中科院知识创新工程重要方向性项目(KZCX2-YW-JC301);东北地理与农业生态研究所前沿领域项目(KZCX3-SW-NA09-12)

摘　　要：选取退耕还湿火烧当年的土壤,研究了火烧和未烧对照0-10 cm,10-20 cm和20-30 cm土壤有机碳(SOC)、微生物量碳(MBC)、微生物量氮(MBN)、基础呼吸(BR)、呼吸势(PR)、微生物商(Cmic/Corg)和代谢商(qCO2)的变化规律。结果表明,火烧0-10 cm土壤微生物量碳、微生物氮、基础呼吸、微生物商和代谢商分别增加6.7%,26.8%,23.1%,18.7%和15.4%,火烧0-10 cm土壤有机碳低于未烧对照,且差异显著,而火烧0-10 cm土壤呼吸势与对照无明显差异;火烧对10-20 cm和20-30 cm土壤无明显影响;火烧增加了0-10 cm土壤可利用的营养物质,增强0-10 cm土壤微生物活性,同时,土壤微生物利用基质的能力下降;而火烧对10-20 cm和20-30 cm土壤的微生物活性无明显影响。Soil organic carbon（SOC）,microbial biomass carbon（MBC）,microbial biomass nitrogen（MBN）,basal respiration（BR）,potential respiration（PR）,microbial quotient（Cmic/Corg） and metabolic quotient（qCO2） of 0-10 cm,10-20 cm and 20-30 cm of burned and unburned restoration marsh soils after fired at the same year were investigated.The result showed that SOC of 0-10 cm of burned soil was lower than unburned soil,that MBC,MBN,BR,Cmic/Corg and qCO2 of 0-10 cm of burned soil was higher than unburned soil by 6.7%,26.8%,23.1%,18.7% and 15.4%,respectively.PR varied insignificantly between burned and unburned soils.No significant were found between the burned and unburned microbial activity of 10-20 cm and 20-30 cm soils.The fire increases the available nutrient and the microbial activity of 0-10 cm soil,however,the fire shows no effect on the microbial activity of 10-20 cm and 20-30 cm soils in restoration marsh.

关 键 词：火烧 退耕还湿 微生物活性 基础呼吸 微生物量碳 代谢商 

分 类 号：S154.3[农业科学—土壤学]