摘要
退化喀斯特植被的恢复机理一直是近年来土壤学和生态学研究的热点。通过分析退化喀斯特植被恢复过程中土壤微生物数量、土壤生化作用强度、土壤微生物生物量,研究了贵州花江喀斯特高原生态综合治理示范区内土壤微生物活性的变化。结果表明:退化喀斯特植被恢复过程中土壤的微生物活性存在较大差异。随着退化喀斯特植被的恢复,土壤细菌、真菌、放线菌三大微生物数量及微生物总数明显上升,表现为乔木群落阶段>灌木群落阶段>草本群落阶段>裸地阶段,且细菌较真菌和放线菌相比占绝对优势,其在微生物总数中分别占95.95%,93.49%,92.32%和92.48%;各主要生理类群的数量呈上升趋势,且氨化细菌>固氮菌>纤维素分解菌>硝化细菌,土壤生化作用强度增强;土壤微生物生物量碳明显增加,微生物生物量碳与土壤有机碳(P<0.01)呈显著正相关关系。土壤微生物是表征退化喀斯特植被恢复过程中土壤质量的重要特征之一,反映出随着退化喀斯特植被的恢复土壤质量也在逐渐恢复。
The regeneration mechanism of the degraded karst vegetation has been the research focus of soil science and ecology in China for the last decade. The amount of soil microbes, soil biochemical function and soil microbial biomass are analyzed during restoration of the degraded karst vegetation and the change of soil microbial activities was studied on ecological synthesis control demonstrated area in Huajiang karst plateau, Guizhou. The results showed that,with degraded karst vegetation restoration, the amount of bacteria, fungi, antinomies and total microbial amount ascend obviously, performing bare land stag〉herbaceous community stag 〉shrubby community stag 〉 arboreal community stag. Compared with the fungi and antinomies, the bacterium is dominant and the proportion is 95. 95%, 93. 49%, 92. 32% and 92. 48% in microbial amount. The amount of major physiological group are increasing, ammoniating bacteria〉nitrifying bacteria 〉cellulose decomposing microbes〉 nitrogen-fixing bacteria. Soil biochemical function, including ammonification, nitrification, cellulose decomposition, respiration and nitrogen fixation are increasing. The soil microbial biomass C ascended significantly. There is a significant positive relationship between soil microbial biomass C and organic C （P〈0.01）. Soil microbes are recommended as one of major characteristics of soil quality during degraded karst vegetation restoration. It reflects that soil quality is restoring gradually with degraded karst vegetation succession.
出处
《中国岩溶》
CAS
CSCD
北大核心
2008年第1期63-67,共5页
Carsologica Sinica
基金
国家重点基础研究发展规划(973)项目(2006CB403206-6)
国家“十一五”科技支撑计划项目(2006BAC01A09)
贵州省优秀科技青年人才计划项目(黔科合人字(2005)0529号)
教育部重点项目(编号205141)
关键词
退化喀斯特植被
恢复过程
土壤微生物
贵州花江
degraded karst vegetation
restoration processes
soil-microorganisms
Huajiang,Guizhou
