贵阳喀斯特地区植被类型与季节变化对土壤微生物生物量和微生物呼吸的影响

土壤微生物特性是土壤修复的指示因子，近年来西南喀斯特地区退化土壤的相关研究较多，但不同植被类型的土壤微生物特性的变化研究相对较少。对贵阳郊区耕作土壤、灌丛、女贞人工纯林和马尾松人工纯林表层土壤（0～10cm）微生物生物量碳（SMBC）、微生物呼吸（MR）和微生物代谢熵（qCO2）的研究结果表明，土壤SMBC和MR均表现为次生林高于耕作土壤，灌丛最高；与qCO2相反，马尾松林土壤微生物活动显著弱于其他样地，不同植被类型土壤微生物活动均表现为在秋季相对较强。与植被类型的显著影响相比，季节变化、植被与季节的交互作用对SM—BC和MR的影响不明显。SMBC与土壤温度不相关，与土壤含水量呈极显著相关而土壤含水量季节变化不明显。MR与土壤温度和含水量均无显著相关性可能是季节变化对两者影响不明显的主要原因，但需要大量区域样本进一步证实。认为演替初期的灌丛比人工阔叶或针叶纯林更有利于土壤微生物群落的生长，土壤有机质积累较快，植被自然恢复是喀斯特退化土壤恢复初期更适合的徐径．

Influence of vegetation types and seasonal variation on soil microbial biomass and microbial respiration in Karst region of Guiyang,southwest China

Soil microbial properties are direct indicators to soil remediation. Great efforts have been made to combat the soil degradation in the Karst regions in southwest China recent years, fewer researches, however, have been performed to examine changes of microbial characteristics of soils in different vegetation types. We measured soil microbial biomass C (SMBC),microbial respiration (MR) and microbial metabolic quotient ( qCO2) on surface soil (0 - 10 cm) in tilled field, shrub, Ligustrum lucidum forest and P...