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土壤活性有机碳既是土壤微生物的活动能源,又是土壤养分循环的主要驱动力。2013年5~10月中旬,在吉林省辉南县孤山屯泥炭沼泽中,对瘤囊薹草(Carex schmidtii)—小叶章(Calamagrostis angustifolia)群落、薹草(Carex spp.)群落和薹草—柳叶绣线菊(Spiraea salicifolia)群落泥炭沼泽0~40 cm深度土壤微生物量碳和水中可溶性有机碳含量分布及其影响因素进行了研究。研究结果表明,各植物群落泥炭沼泽0~20 cm深度土层中的微生物量碳质量浓度在92.40~478.96 g/m~3范围内变化,瘤囊薹草—小叶章群落泥炭沼泽土壤中的微生物量碳含量最低;20~40 cm深度土层中的微生物量碳质量浓度在48.45~348.88 g/m~3范围内变化,在20~40 cm深度土层,各采样日都是薹草—柳叶绣线菊群落泥炭沼泽土壤的微生物量碳质量浓度相对最大,其它依次为薹草群落、瘤囊薹草—小叶章群落;各植物群落泥炭沼泽0~20 cm和20~40 cm深度水中的可溶性有机碳质量浓度的变化范围分别为28.99~53.69 mg/L和22.20~66.71 mg/L;6个采样日,薹草群落和薹草—柳叶绣线菊群落泥炭沼泽0~20 cm深度土层微生物量碳含量明显大于20~40 cm深度土层,而薹草群落泥炭沼泽20~40 cm深度水中的可溶性有机碳含量都高于上层;微生物量碳含量的对数与可溶性碳含量的对数为负相关关系;土壤微生物量碳含量的主要影响因素是土壤有机碳含量、全氮含量、全磷含量、氮磷比、硝态氮含量和水位,水中可溶性有机碳含量的主要影响因素是总氮含量、总磷含量和0 cm土壤温度。
Soil active organic carbon is not only the active energy of soil microorganisms, but also the main driving force of soil nutrient cycle. From May to the middle of October 2013, in Carex schmidtii-Calamagrostis angustifolia community, Carex spp. Community and Carex spp. Community in Gushanlu peat swamp in Huinan County of Jilin Province, The distributions of soil microbial biomass carbon and water-soluble organic carbon in the depth of 0-40 cm in the peat swamp of the Spiraea salicifolia community and their influencing factors were studied. The results showed that the microbial biomass carbon concentration in the depth of 0 ~ 20 cm in the peat swamp of each plant community varied from 92.40 to 478.96 g / m ~ 3. The growth of microorganisms in the soil of peat bog The lowest content of carbon in soil; the mass concentration of microbial biomass carbon in 20 ~ 40 cm soil depth ranged from 48.45 ~ 348.88 g / m ~ 3; in 20 ~ 40 cm soil depth, The biomass of the soil in the Phyllostachys meyeri community in peat swamp was relatively the largest, followed by the sedge community and S. angustifolia community; in the peat swamps of 0-20 cm and 20-40 cm, The concentration range of soluble organic carbon was 28.99-53.69 mg / L and 22.20-66.71 mg / L, respectively. Six sampling days, the sedge community and the sedge grass-Willow Spiraea community peat swamp 0-20 cm depth soil The content of soil microbial biomass C was significantly higher than that of soil layer 20 ~ 40 cm, while the content of soluble organic carbon was higher in 20-40 cm depth of the peat swamp than that in the upper layer. The logarithm of microbial biomass C and soluble carbon The number of negative correlation; soil microbial biomass carbon content of the main The main influencing factors are soil organic carbon content, total nitrogen content, total phosphorus content, N / P ratio, nitrate nitrogen content and water level, and total nitrogen, total phosphorus and 0 cm soil temperature.