冬季火烧对川西亚高山草甸土壤理化性质的影响  

Effects of winter wildfire on soil physical and chemical properties of western Sichuan subalpine grassland

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,四川成都610081

出　　处：《草业科学》2014年第5期811-817,共7页Pratacultural Science

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：为探究冬季火烧对草地土壤理化性质的影响,以2010年12月5日发生火灾的川西地区亚高山草地为研究对象,对比火烧与未火烧草地表层0-20cm土层土壤理化性质的差异,发现冬季火烧并不足以改变土壤含水量、容重和孔隙度,却在一定程度上改善了土壤的通气性,并显著提高了0-5cm土层土壤的有机质、全氮、有效磷和速效钾的含量(P<0.05),但未改变土壤的可溶性碳、氮含量。总的来说,冬季火烧改善了翌年草地植物生长的土壤环境,不仅为根系生长提供了更大的扩展空间,还为植物生长提供了更多的养分资源。To explore the effects of winter wildfire on soil physical and chemical properties of western Sichuan subalpine grassland, subalpine areas with and without fire on west Sichuan were selected as researched regions. Comparing the soil physical and chemical properties of the surface soil at 0-20 cm depth, soil moisture and density of soils in alpine grassland did not change by winter wildfire although soil aeration performance improved. Moreover, winter wildfire significantly increased the content of surface layer soil organic matter, total nitrogen, available potassium and available phosphorus （P〈0.05）, however, winter wildfire did not change the soil soluble nitrogen content significantly. Overall, winter fire behavior can improve soil environment for plant growth by providing greater extended space for root growth and more nutrients for plant growth.

关 键 词：冬季火烧 亚高山草地 土壤理化性质 青藏高原 

分 类 号：S812.2[农业科学—草业科学]