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【目的】揭示连栽马尾松林根际土壤环境在垂直方向上的变化。【方法】以不同栽植代数的马尾松人工林作为研究对象,采用配对样地法,于2015年10月,对比研究不同代马尾松人工林的根际与非根际土壤可培养微生物数量及土壤酶活性土层垂直变化特征。【结果】两代马尾松人工林根际土壤可培养微生物数量与酶活性的土层垂直分布特征明显,均表现为在0~10cm土层最高,在>10~20cm土层较低,在>20~30cm土层最低;同层次不同代之间比较,二代林根际土壤可培养微生物数量及酶活性均高于一代林,除土壤脲酶活性在代际间没有统计学意义上的差异外,其余酶的活性和3大类微生物数量在代际间的差异具有统计学意义(p<0.05);两代马尾松人工林各土层根际可培养微生物数量与酶活性皆高于非根际,随着土层加深,根际与非根际间没有呈现出明显相关规律;两代马尾松林微生物与土壤酶呈统计学意义上的正相关关系(p<0.01)。【结论】连栽提高了马尾松林根际土壤微生物数量和酶活性,二代林根际土壤性质在土层垂直方向上的表现均优于一代林。
【Objective】 The objective of this study was to reveal the vertical variation of rhizosphere soil environment in a replanted Pinus massoniana forest. 【Method】 With different alpine-planted Pinus massoniana plantations as the object of study, the method of paired plots was used to compare the numbers of culturable microorganisms and soils in rhizosphere and non-rhizosphere soil of Pinus massoniana plantations in October 2015 Vertical variation of soil enzyme activity. 【Result】 The results showed that the vertical distribution of soil microbial biomass and enzyme activity in rhizosphere soil of Pinus massoniana plantations was obvious, with the highest in 0-10cm soil layer, the lowest in> 10-20cm soil layer, 20-30 cm soil layer was the lowest. Compared with different generations, the number and enzyme activities of culturable microorganisms in the rhizosphere soil of the second generation forest were higher than those of the generation forest. In addition to no significant difference in soil urease activity between generations , The activity of other enzymes and the quantity of three kinds of microorganisms in intergenerational were statistically significant (p <0.05). The number of rhizosphere culturable microorganisms and enzyme activity in two generations of Pinus massoniana plantation were higher than those in non-root However, there was no significant correlation between rhizosphere and non-rhizosphere soil layers with the deepening of soil layers. There was a statistically significant positive correlation between soil microorganisms and soil enzymes (P <0.01). 【Conclusion】 Continuous cropping increased soil microbial biomass and enzyme activity in the rhizosphere of Pinus massoniana forest. The soil properties of the second generation forests in the vertical direction of the soil layers were superior to those of the first generation forests.