*国家自然科学基金项目(49871046) 、 国家重点基础研究发展规划项目(G1999011801) 和中国科学院红壤生态开放实验站基金项目资助通讯作者, E -mail: fenghu njau1edu1cn收稿日期: 2002- 06- 05; 收到修改稿日期: 2002- 12- 28退化红壤不同植被恢复下土壤微生物量 季节动态及其指示意义*刘满强1 胡 锋1 何园球2 李辉信1( 1 南京农业大学资源与环境科学学院, 南京 210095)( 2 中国科学院南京土壤研究所, 南京 210008)摘 要 不同植被恢复下退化红壤恢复10 a 后土壤微生物生物量( C、 N) 的季节动态分析表明: 相比侵蚀裸地, 植被恢复显著提高了土壤微生物量。不同植被对微生物量的影响具有极显著差异( p 干扰荒草地 小叶栎 混交林木荷 马尾松; 不同植被下微生物量 N 的差异更为明显。土壤微生物量呈高度季节变异, 植被与季节存在极显著的交互作用( p干扰荒草地(自荒 1, G1) 小叶栎(Qc) 混交林(Sm) 木荷( Ss) 马尾松( Pm), 其中 G1、 G2 之间及其与所有林地均达到显著差异(p slightly disturbed grassland ( G1) deciduous broadleaf woodland(Qc) coniferous -broadleaved mixed woodland ( Sm) evergreen broadleaf woodland ( Ss) coniferous woodland ( Pm) . Compared with microbial biomass C, microbial biomass N was more sensitive to the veg -etations type. Soil microbial biomass showed a high degree of seasonality, and seasonal fluctuations were not consistent under different vegetations. ANOVA and Discriminant analysis indicated that vegetationshad greater impact on soil microbial biomass than seasons. Stratification of microbial biomass was evident with sharply declined at lower depths. Changes of soil microbial biomass imposed by vegetations and sea -sons mainly happened in the surface layer of soil ( 0 5cm) . Soil microbial biomass was significantly and positively correlated with soil organicmatter and other biological properties, also it was capable of discrim -inating different vegetations distinctly. So soil microbial biomass had great potential as an indicator of red soil quality. Using soil microbial biomass to monitor the recovery of degraded red soil, soil sampling inspring was suitable and at least 0 10cm soil layer should be analyzed separately. Some possible high - lights in future study of red soil microbial biomass were also briefly given. Key words Degraded red soil, Vegetation restoration, Soil microbial biomass, Seasonal dynam -ics, Red soil quality944 土 壤 学 报40卷