炼山及遮阳网覆盖对马尾松人工林土壤微生物生物量碳和氮的影响  

Effects of controlled burning and sun-shading net covering on soil microbial biomass carbon and nitrogen in a Pinus massoniana plantation

作　　者：黄莉[1] 吴福忠[1] 杨万勤[1] 宋会兴[1] 陈良华[1] 谭波[1] 苟小林[1] 李志萍[1] 

机构地区：[1]四川农业大学生态林业研究所,生态林业工程重点实验室,成都611130

出　　处：《应用与环境生物学报》2014年第2期261-267,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家科技支撑计划课题(2011BAC09B05);四川省教育厅科技创新团队项目(11TD006);四川省应用基础研究项目(2012JY047);四川省杰出青年学术技术带头人培育计划项目(2012JQ0059)资助~~

摘　　要：以炼山和不炼山的马尾松人工林为研究对象,采用遮阳网地表覆盖的方法,在炼山和覆盖后第60天(d 60)、d 150和d 300动态采集不同层次土壤样品,研究土壤微生物生物量碳和氮及其格局的动态过程.结果表明:炼山对覆盖后d 60、d 150和d 300土壤微生物生物量氮的影响显著(P<0.05),分别降低了21%-63%、63%-108%、52%-97%.遮阳网覆盖可以明显增加炼山和不炼山环境下土壤微生物生物量碳和氮含量,但并不能完全改变炼山对土壤微生物生物量的负面效应.较之遮光率100%的遮阳网,遮光率85%的遮阳网覆盖更有效地促进了土壤微生物生物量的增加,可能更为有效地促进土壤微生物群落的恢复.同时,炼山和遮阳网覆盖均不能显著改变土壤微生物生物量碳氮比(P>0.05).此外,炼山和覆盖后d 60时3个土壤层次土壤微生物生物量并无显著差异(P>0.05),但d 150和d 300,15-30 cm土壤微生物生物量显著低于其他两个土层(P<0.05),且以无遮阳网覆盖处理更为明显.Though sun-shade net covering was regarded to be able to alleviate the negative effects of controlled burning on soil microbial characters, little attention has been paid to it. This study investigated the soil microbial biomass C and N and their dynamic patterns in both controlled-burning and none burning Pinus massoniana plantations covered with sun-shading nets. Soils in three layers were sampled after covering for 60, 150 and 300 days. The results showed that controlled burning significantly reduced soil microbial biomass N contents after covering 60 days, 150 days and 300 days （P 〈 0.05）, by 21- 63%, 63-108% and 52-97%, respectively. Sun-shading net covering could significantly increase soil microbial biomass C and N contents in both burning and non-burning environment, but it could not completely alter the negative effects of controlled burning on soil microbial biomass. Sun-shading net with 85% shading rate could increase soil microbial biomass more than that with 100% shading rate, thus more effective in recovering soil microbial community. However, either controlled burning or sun-shading net covering did not significantly change soil microbial biomass carbon/nitrogen ratio （P 〉 0.05）. In addition, there were insignificant differences in soil microbial biomass in three soil layers after controlled burning 60 days （P 〉 0.05）. In contrast, soil microbial biomass in 15-30 cm was significantly lower than that in the other two layers after controlled burning tbr 150 days and 300 days （P 〈 0.05）, especially in the treatment with no shading net covering.

关 键 词：炼山 遮阳网覆盖 马尾松人工林 土壤微生物生物量 

分 类 号：S791.248[农业科学—林木遗传育种]