五台山土壤水稳性团聚体有机碳分布特征

发布时间：2018-01-27 00:51

本文关键词： 五台山水稳性团聚体颗粒有机碳矿物结合有机碳　出处：《水土保持学报》2017年04期 　论文类型：期刊论文

【摘要】：为揭示五台山垂直带土壤不同形态团聚体有机碳的分布特征,以五台山垂直带土壤为研究对象,于2016年8月从高海拔至低海拔对亚高山草甸土、山地草甸土、棕壤、淋溶褐土、石灰性褐土样品进行采集,并且通过湿筛法和物理分组技术获得不同土壤类型中2,2~0.25,0.25~0.053,0.053mm水稳性团聚体,进一步分析了土壤及各级水稳性团聚体的总有机碳、颗粒有机碳(POC)和矿物结合有机碳(MOC)。结果表明:亚高山草甸土、山地草甸土和棕壤均以2mm团聚体为最多,达到总水稳性团聚体的45.13%。然而,淋溶褐土和石灰性褐土中分别以2~0.25mm和0.25~0.053mm团聚体为最多,分别达到33.79%和39.95%。随着海拔高度的降低土壤有机碳含量依次降低,且不同土壤类型中,2mm和2~0.25mm团聚体有机碳含量与其对应的土壤有机碳含量呈极显著正相关关系,相关系数分别为r2mm=0.986和r2~0.25mm=0.966(P0.01)。随着土壤团聚体粒径的减小,亚高山草甸土、山地草甸土、棕壤的POC含量呈现下降趋势,而淋溶褐土和石灰性褐土的POC含量呈现升高趋势。亚高山草甸土、山地草甸土、棕壤的MOC含量都以2mm团聚体为最大,淋溶褐土和石灰性褐土分别以2~0.25mm和0.25~0.053mm团聚体的MOC含量为最大。各土壤及团聚体中MOC的含量要明显大于POC的含量,而且在土壤和各级大团聚体中二者呈现正相关关系(P0.05)。此外,各土壤POC和MOC的含量与土壤有机碳含量也呈现正相关关系(P0.05)。因此,随着海拔高度的降低,各土壤团聚体组成由大团聚体向微团聚体转变,亚高山草甸土、山地草甸土、棕壤的碳截获能力强于淋溶褐土和石灰性褐土。
[Abstract]:In order to reveal the distribution characteristics of organic carbon in soil aggregates of different forms in the vertical zone of Wutai Mountain, the soil in the vertical zone of Wutai Mountain was studied from high altitude to low altitude in August 2016 to subalpine meadow soil. The samples of mountain meadow soil, brown soil, leached cinnamon soil and calcareous cinnamon soil were collected, and different soil types were obtained by wet sieve method and physical grouping technique. The total organic carbon of soil and water stable aggregates of different levels were further analyzed by 0.053mm water stable aggregates. The results showed that the subalpine meadow soil, mountain meadow soil and brown soil had the most 2mm aggregates. 45.13% of the total water-stable aggregates were obtained. However, the most common aggregates in leached cinnamon soil and calcareous cinnamon soil were 0.25mm and 0.250.53mm, respectively, in leached cinnamon soil and calcareous cinnamon soil. It reached 33.79% and 39.95, respectively. With the decrease of altitude, the content of soil organic carbon decreased in turn, and in different soil types. The content of organic carbon in 2mm and 0.25mm aggregates was positively correlated with the corresponding soil organic carbon content. The correlation coefficients were r _ 2mm ~ (0.986) and r _ (2) ~ (0.25) mm ~ (-1) ~ 0.966p _ (0.01), respectively. With the decrease of soil aggregate size, subalpine meadow soil and mountain meadow soil were found to be subalpine meadow soil and mountainous meadow soil. The POC content of brown soil decreased while that of leached cinnamon soil and calcareous cinnamon soil increased. The MOC content of brown soil was the highest in 2mm aggregate. The content of MOC in leaching cinnamon soil and calcareous cinnamon soil was the highest in 0.25mm and 0.255mm aggregate, respectively. The MOC content in each soil and aggregates was obviously higher than that in POC soil. Content. In addition, there was a positive correlation between soil and macroaggregates. There was a positive correlation between the contents of POC and MOC and the content of soil organic carbon. Therefore, with the decrease of altitude, the contents of POC and MOC were positively correlated with the content of soil organic carbon. The composition of soil aggregates changed from large aggregates to microaggregates. The carbon interception ability of subalpine meadow soil, mountain meadow soil and brown soil was stronger than that of leached cinnamon soil and calcareous cinnamon soil.
【作者单位】：山西农业大学资源环境学院;山西农业大学农业资源与环境国家级实验教学示范中心;
【基金】：山西省科技攻关项目(20120313011-1)
【分类号】：S152.4
【正文快照】： 土壤是陆地最大的有机碳库,含碳量大约2 400Pg(深2m),是目前大气中二氧化碳含碳量的3倍和年平均化石燃料排放量的240倍[1],土壤有机碳的固存对全球气候的改善至关重要。土壤团聚体是土粒通过各种自然过程的作用而形成的直径10mm的基本结构单元,对土壤的基本理化性质有较大的

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