Control factor of the spatial variations in the soil organic carbon content in the topsoil of the Xingkai Lake Plain
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摘要: 准确获取兴凯湖平原土壤有机碳含量及空间变异主控因素,对土壤有机碳调控、恢复及农业可持续发展具有重要意义。本研究基于野外实地采集的4 151个表层(0~20 cm)土样,探讨兴凯湖土壤平原有机碳空间分布特征及其主控因素。运用地统计学、回归分析等方法对比了成土母质、土壤质地、土壤类型、土地利用方式和土地开垦年限这5种因素对兴凯湖平原土壤有机碳空间分布的影响。结果表明: 研究区表层土壤有机碳含量为0.35%~14.49%,平均值2.80%,变异系数为 0.44,属中等强度的空间变异性。块金效应 C0/(C0+C)为 47.06%,表明空间分布受结构性因素和随机性因素的共同影响,土壤有机碳总体呈现“中、西部低,东、北部高”的分布格局。上述5种因素对土壤有机碳的影响均为极显著(P<0.01),其中成土母质、土壤类型、土地利用方式及开垦年限分别能够独立解释6.8%、3.8%、9.2%和3.3%的土壤有机碳空间变异,而土壤质地能独立解释30.1%的土壤有机碳空间变异,远大于其余4种因素,是研究区土壤有机碳空间分布的主控因素。Abstract: Obtaining accurate soil organic carbon (SOC) content in the Xingkai Lake Plain and the main factor controlling its spatial variation is greatly significant for controlling and restoring the SOC content and achieving sustainable agricultural development. This study investigated the spatial distribution characteristics of the SOC content in the Xingkai Lake Plain and their control factor based on 4,151 topsoil samples collected at a depth of 0~20 cm in the field. Moreover, it compared the effects of soil parent materials, soil texture, soil type, land use type, and land reclamation duration (year) on the spatial distribution of the SOC content in the plain through geostatistical and regression analyses. The results are as follows. The SOC content in the topsoil of the study area is 0.35%~14.49% (average: 2.80%). It has a coefficient of variation of 0.44, indicating moderate spatial variations. It has a nugget-to-sill ratio of 47.06%, indicating that its spatial distributions are affected by both structural and random factors. It is low in the middle and west and is high in the east and north overall. All these five factors have significant effects on the SOC content (P<0.01). Among them, soil parent materials, soil type, land use type, and land reclamation duration can independently account for 6.8%, 3.8%, 9.2%, and 3.3% of the spatial variations in the SOC content, respectively. By contrast, soil texture can independently account for 30.1% of the spatial variations of the SOC content, which is far greater than that of the other four factors. Therefore, soil texture is the main control factor in the spatial distribution of the SOC content in the study area.
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Key words:
- SOC /
- spatial variation /
- main control factor /
- Xingkai Lake Plain
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