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半干旱区县域尺度土壤有机碳的空间变异特征

李龙,姚云峰*,秦富仓,郭月峰,高玉寒,张美丽   

  1. (内蒙古农业大学生态环境学院,呼和浩特010018)
  • 出版日期:2016-08-10 发布日期:2016-08-10

Spatial variability of soil organic carbon in semi-arid zone at a county scale.

LI Long, YAO Yun-feng*, QIN Fu-cang, GUO Yue-feng, GAO Yu-han, ZHANG Mei-li   

  1. (College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010018, China).
  • Online:2016-08-10 Published:2016-08-10

摘要: 选择赤峰市敖汉旗为研究对象,收集0~20、20~40、40~60、60~80、80~100 cm深度土壤样品,采用半变异函数及克里格插值方法,分析研究区土壤有机碳的空间变异及其垂直分布特征。结果表明,研究区0~100 cm土壤深度内,土壤有机碳含量在0.23~20.71 g·kg-1,主要富集在0~40 cm深度的土壤中(47.80%)。呈现出随着土壤深度的增加,有机碳含量逐渐降低的趋势。表层(0~20 cm)土壤有机碳的空间相关度\[C0/(C+C0)\]为36.61%,具有中等强度的空间相关性。20~100 cm间4层土壤有机碳的C0/(C+C0)均小于25%,具有强烈的空间相关性。土壤类型是决定土壤有机碳空间分布的主导因素。防止土壤沙化、控制水土流失是提高研究区土壤有机碳含量的有效措施。

关键词: 火烧强度, 大兴安岭, 火干扰, 地上碳储量

Abstract: The semivariograms and geostatistical method were used to analyze the spatial variations of soil organic carbon (SOC) in Aohan Chifeng, Inner Mongolia, based on soil samples from 0-20, 20-40, 40-60, 60-80 and 80-100 cm layers. The results showed that SOC contents ranged between 0.23 and 20.71 g·kg-1 and decreased gradually with increasing soil depth. The spatial correlations \[C0/(C+C0) ratio\] of SOC contents in the soil layer of 0-20 cm was 36.61% with a moderate spatial correlation, and the C0/(C+C0) ratio of SOC contents in the soil layers of 20-100 cm was <25% with a strong spatial correlation. Soil type was the major factor affecting the spatial variability of SOC content. Prevention of soil and water loss and control of soil desertification might be the effective measures to increase SOC content in the study region.

Key words: fire disturbance, fire severity, aboveground carbon storage, Great Xing’an Mountains.