摘要
本文以冀北辽河源地区不同林龄油松天然林为研究对象,研究其土壤微生物生物量碳、微生物呼吸及微生物代谢熵随油松林龄的变化趋势。结果表明:随着油松天然林林龄的增加,土壤微生物生物量碳逐渐增加;而土壤微生物呼吸则呈现出先减小后增加的趋势;微生物代谢熵表现为随油松林林龄的增加而降低。相关性分析表明,土壤微生物生物量碳、微生物呼吸分别与微生物代谢熵之间呈现高度的极显著线性负相关。微生物生物量碳与微生物呼吸呈极显著正相关,但线性相关程度较弱。土壤微生物生物量碳和微生物呼吸与土壤温度和含水量均呈极显著正相关,而土壤微生物代谢熵则与土壤温度、土壤含水量呈极显著负相关。上述结果表明,在冀北辽河源地区,土壤微生物生物量碳、微生物呼吸、微生物代谢熵与油松天然林林龄密切相关。随着油松天然林林龄的增加,其土壤微生物活性增强,碳代谢效率增加,土壤质量及可持续利用潜力更高,土壤生态体系更加成熟。
Taking Pinus tabulaeformis with different ages in Liao River source region of northern Hebei as study objects, the variations of MBC, MR and qCO2 were studied. The results showed that with the incrase of forest age, MBC increased gradually, MR decreased first and then increased, soil microbial metabolic quotient decreased. Both MBC and MR had extremely significant negative linear correlation with qCO2, MBC and MR had an extremely significant positive correlation, while the linear correlation was weaker. Both MBC and MR had extremely significant positive correlation with soil temperature and water content, qCO2 had extremely significant negative correlation with soil temperature and water content. These results demonstrated that MBC, MR and qCO2 was closely related to forest age. With the increasing age ofPinus tabulaeformis, soil microbial activity was enhanced and the efficiency of carbolic metabolism increased, which give the soil a higher quality and a greater potential of sustainable use and a more stable ecosystem.
出处
《土壤》
CAS
CSCD
北大核心
2015年第3期550-557,共8页
Soils
基金
林业公益性行业科研专项(201204101)资助
关键词
油松天然林
土壤微生物生物量碳
土壤微生物呼吸
土壤微生物代谢熵
Pinus tabulaeformis forest
Soil microbial biomass carbon
Soil microbial respiration
Soil microbialmetabolic quotient
