LI Long,ZHOU Fei,TIAN Jie,et al.Effects of Topographic Factors on Soil Organic Carbon Content in Semi-arid Regions[J].Northern Horticulture,2019,43(16):104-109.[doi:10.11937/bfyy.20190162]
地形因子对半干旱地区土壤有机碳含量的影响
- Title:
- Effects of Topographic Factors on Soil Organic Carbon Content in Semi-arid Regions
- Keywords:
- soil organic carbon; soil depth; topographic factors; semi-arid zone
- 文献标志码:
- A
- 摘要:
- 以内蒙古赤峰市敖汉旗为研究对象，以实地调查数据为基础，综合考虑研究区海拔、坡度和坡向因素，根据全旗182个土壤采样剖面数据，分析0～100 cm深度各土层有机碳含量的垂直分布特征及地形因素对有机碳含量的影响。结果表明：土壤有机碳含量随土壤深度的增加而显著降低。海拔对土壤有机碳含量的影响表现为，0~60 cm土壤深度有机碳含量呈现出随着海拔的升高而逐级上升的趋势；而60 cm土壤深度以下土壤有机碳含量与海拔的变化并未表现出显著的相关关系。坡度对土壤有机碳含量的影响表现为，随着坡度的增加各深度土壤有机碳含量均表现为先升高后降低的分布特征。不同坡向上各层土壤有机碳的平均含量由高到低表现为阴坡>半阴坡>半阳坡>阳坡，其中阴坡与半阴坡上土壤有机碳含量显著高于阳坡与半阳坡。当土壤深度达到40 cm以下时，坡度和坡向对土壤有机碳含量的影响并未表现出显著的差异性。
- Abstract:
- Aohan county in Chifeng，Inner Mongolia was collected as the research object.Based on soil survey data，considering the factors of elevation，slope and aspect of the study area，182 soil sampling profiles of the whole Banner were collected.The effect of topographic factors on the organic carbon content of the soil layers in 0-100 cm depth was analyzed.Soil organic carbon(SOC) content decreased significantly with the increase of soil depth.The effect of elevation on SOC content showed that the SOC in 0-60 cm soil depth showed a trend of rising at the elevation of altitude.However，the SOC content under 60 cm depth showed no significant correlation with the change of elevation.As the slope increased，the SOC of each depth soil was shown as increased at first and decreased subsequently.The average SOC content in different slope aspects from high to low was shady slope>half shady slope>half sunny slope>sunny slope，SOC content of shady slope and half shady slope was significantly higher than those of sunny slope and half sunny slope.When the depth of soil reached 40 cm，slope and slope aspect had no influence on SOC content.
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备注/Memo
第一作者简介：李龙（1989-），男，博士，讲师，研究方向为水土保持与荒漠化防治。E-mail:lilongdhr@126.com.基金项目：国家自然科学基金青年基金资助项目（41807079）。收稿日期：2019-03-05