塔里木盆地北缘绿洲不同土地利用方式土壤有机碳、无机碳变化及其土壤影响因子

发布时间：2018-03-13 12:12

本文选题：土壤有机碳　切入点：土壤无机碳　出处：《中国农业大学学报》2017年12期 　论文类型：期刊论文

【摘要】：以塔里木盆地北缘典型绿洲阿拉尔垦区为靶区,结合经典统计学和冗余分析技术,研究绿洲7种土地利用类型土壤有机碳、无机碳含量与土壤理化因子的分异规律及相关性。统计分析显示,研究区不同土地利用类型土壤有机碳、无机碳含量在各土层具有不同的分布格局,相同土层不同类型间的分布存在一定差异。0~20、20~50和50~80cm土层有机碳含量均值分别为6.97、2.95和2.45g/kg,无机碳含量为4.83、5.25和3.48g/kg;在0~20cm土层中,有机碳含量以天然林最高、沙地最低,无机碳表现为棉田、盐碱地、荒草地、沙地含量显著高于其他3种类型;20~50cm土层中,有机碳含量最高值出现在天然林、人工林中,且显著高于荒草地和沙地,无机碳分布与0~20cm土层保持一致;50~80cm土层中,果园、棉田有机碳含量显著高于沙地,各类型无机碳含量差异不显著。冗余分析结果表明:土壤有机碳含量与全氮、土壤含水量呈极显著正相关(P0.01),与容重极显著负相关(P0.01),无机碳含量与全盐呈极显著正相关(P0.01),与全氮、土壤含水量、速效钾呈极显著负相关(P0.01),pH、有效磷则与土壤有机碳和无机碳含量的相关性均未达显著水平(P0.05);各理化因子对土壤有机碳、无机碳含量影响的重要性排序为:全氮容重土壤含水量有效磷速效钾全盐pH。
[Abstract]:Taking Alar Reclamation area, a typical oasis in the northern margin of Tarim Basin, as the target area, combined with classical statistics and redundancy analysis techniques, the soil organic carbon (SOC) of seven land use types in oasis was studied. Statistical analysis showed that soil organic carbon and inorganic carbon content in different land use types had different distribution patterns in different soil layers. There were some differences in the distribution of organic carbon between different types of soil layers. The mean values of organic carbon content in different soil layers were 6.97 ~ 2.95 and 2.45 g / kg, respectively, and the inorganic carbon contents were 4.83 ~ 5.25 and 3.48 g / kg 路kg ~ (-1) respectively. In 0 ~ 20 cm soil layer, the organic carbon content was the highest in natural forest, the lowest in sandy land, and the lowest in cotton field. The content of organic carbon in saline-alkali land, barren grassland and sandy land was significantly higher than that in the other three types of soil layers (20 ~ 50cm), and the highest value of organic carbon was found in natural forest and artificial forest, and was significantly higher than that in barren grassland and sandy land. The distribution of inorganic carbon was consistent with that of 0 ~ 20cm soil layer (50 ~ 80cm). The content of organic carbon in orchard and cotton field was significantly higher than that in sandy land, but there was no significant difference in the content of inorganic carbon among different types. The results of redundancy analysis showed that the content of soil organic carbon and total nitrogen, Soil water content was significantly positively correlated with P0.01N, and negatively correlated with bulk density (P0.01A). Inorganic carbon content was significantly positively correlated with total salt (P0.01N), total nitrogen (TN) and soil water content (soil moisture). There was a very significant negative correlation between available potassium and soil organic carbon and inorganic carbon, but no significant correlation between available phosphorus and soil organic carbon and inorganic carbon. The order of importance of the effect of inorganic carbon content was: soil moisture content of total nitrogen bulk density, available phosphorus, available potassium, total salt pH.
【作者单位】：新疆大学资源与环境科学学院/绿洲生态教育部重点实验室;
【基金】：自治区青年科技创新人才培养工程(qn2015yx002) 国家自然科学基金项目(41461105)
【分类号】：S153.6

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