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为揭示大兴安岭北部不同森林类型土壤微生物量碳和水溶性有机碳变化特征,选择大兴安岭北部典型植被类型白桦林、山杨林、兴安落叶松林、樟子松林和白桦-山杨林为研究对象,分析不同月份及不同土层间土壤微生物量碳和水溶性有机碳变化规律。结果表明:大兴安岭北部5种主要森林类型0~32 cm土壤微生物量碳和水溶性有机碳含量波动范围分别为220.40~909.54 mg kg-1和21.22~211.93 mg kg-1,不同林型之间差异显著,微生物量碳表现出阔叶林大于针叶林的趋势,水溶性有机碳则表现为落叶松林>白桦-山杨林>山杨林>白桦林>樟子松林。5种森林类型微生物量碳和水溶性有机碳有着明显的季节动态,微生物量碳总体表现为在6月或10月达到较高值,在7~9月出现较低值。水溶性有机碳总体表现为在6、8、10月的含量较高,7月和9月较低。两种活性碳均表现为随土壤深度的加深而逐渐降低。不同林型各月份微生物量碳和水溶性有机碳占总有机碳的比例范围分别为0.64%~7.60%和0.08%~0.67%,微生物量碳分配比例随土壤深度加深表现出上升趋势,水溶性有机碳则波动性较大。土壤蔗糖酶、脲酶、碱性磷酸酶和总有机碳与两种活性碳的相关关系均达极显著水平(P<0.01),表明这些指标可以对活性碳预测起到指示性作用。
In order to reveal the characteristics of soil microbial biomass carbon and water-soluble organic carbon in different forest types in the northern part of the Greater Hinggan Mountains, the typical vegetation types of Betula platyphylla, Populus davidiana, Larix gmelinii, Pinus sylvestris var. Mongolica and Betula platyphylla stand in the northern part of Daxinganling were studied. Changes of soil microbial biomass carbon and water - soluble organic carbon in different months and different soil layers. The results showed that the fluctuation range of soil microbial biomass carbon and water-soluble organic carbon in 0 ~ 32 cm soil layer of the five main forest types in the northern part of Daxinganling ranged from 220.40 to 909.54 mg kg-1 and 21.22 to 211.93 mg kg-1, respectively. The differences among different forest types Significantly, microbial biomass carbon showed a trend of broadleaved forest larger than that of coniferous forest, while water-soluble organic carbon showed the larch forest> birch-poplar forest> poplar forest> birch forest> Pinus sylvestris forest. There were obvious seasonal dynamics of microbial biomass carbon and water-soluble organic carbon in the five forest types. The overall microbial biomass carbon showed a higher value in June or October and a lower value in July-September. Water-soluble organic carbon as a whole showed a higher content in June, August and October, lower in July and September. Both activated carbon showed a gradual decrease with the deepening of soil depth. The percentage of microbial biomass carbon and water-soluble organic carbon to total organic carbon in different forest types ranged from 0.64% to 7.60% and 0.08% to 0.67%, respectively. The distribution of microbial biomass carbon showed an upward trend with the deepening of soil depth, Organic carbon is more volatile. The correlation between soil invertase, urease, alkaline phosphatase and total organic carbon and the two activated carbons reached extremely significant levels (P <0.01), indicating that these indicators could play an indicative role in the prediction of activated carbon.