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  

SEASONAL DYNAMICS OF SOIL MICROBIAL BIOMASS AND ITS SIGNIFICANCE TO INDICATE SOIL QUALITY UNDER DIFFERENT VEGETATIONS RESTORED ON DEGRADED RED SOILS

作　　者：刘满强[1] 胡锋[1] 何园球[2] 李辉信[1] 

机构地区：[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

出　　处：《土壤学报》2003年第6期937-944,共8页Acta Pedologica Sinica

基　　金：国家自然科学基金项目 (4 9871 0 46);国家重点基础研究发展规划项目 (G1 9990 1 1 80 1 );中国科学院红壤生态开放实验站基金项目资助

摘　　要：不同植被恢复下退化红壤恢复 1 0a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 <0 0 1 ) ,0～5cm土层的季节平均值顺序为 :保护荒草地 >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<0 0 1 ) ,但季节的影响低于植被 ;植被和季节的影响主要反映在 0～ 5cm土层。微生物量与土壤有机质及其它生物活性指标高度相关 (p<0 0 1 ) ,且能很好地区分不同植被间的差异 ,在红壤质量指示方面潜力很大。利用微生物量监测红壤质量恢复 ,建议春季为采样期 ,至少单独分析 0～ 1Seasonal dynamics of soil microbial biomass C and N were measured under six vegetations restored for 10 years on degraded red soils. Vegetation increased soil microbial biomass(C and N) markedly in comparison with the eroded bare soil (CK). Soil microbial biomass expressed by seasonal means in 0～5cm soil layer differed significantly (p<0.01) among vegetations, and they were decreased in the following order: protected grassland (G2) >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 vegetations 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 vegetations had 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 seasons mainly happened in the surface layer of soil (0～5cm). Soil microbial biomass was significantly and positively correlated with soil organic matter and other biological properties, also it was capable of discriminating 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 in spring was suitable and at least 0～10cm soil layer should be analyzed separately. Some possible highlights in future study of red soil microbial biomass were also briefly given.

关 键 词：退化红壤 植被恢复 土壤微生物量 季节动态 红壤质量 

分 类 号：S154.2[农业科学—土壤学]