祁连山森林草原带坡面尺度土壤有机碳分布

发布时间：2018-03-05 01:34

本文选题：祁连山　切入点：坡向　出处：《中国沙漠》2016年03期 　论文类型：期刊论文

【摘要】：以祁连山森林草原带3个山头为研究对象,在坡面尺度上分析了坡向和坡位对不同深度(0~10、10~20、20~40、40~60cm)土壤有机碳浓度和密度的影响。结果表明:坡肩、背坡及坡脚各层有机碳浓度变化趋势为北坡西坡西南坡南坡,不同沟谷土壤有机碳浓度差异不显著。有机碳浓度的坡位分布因坡向而异,在南坡、西南坡及西坡,沟谷各层有机碳浓度均显著高于其他坡位(P0.05),坡脚高于坡肩与背坡;在北坡,坡肩、背坡及坡脚有机碳浓度无显著差异,沟谷20~40、40~60cm土层有机碳浓度显著低于坡肩(P0.05)。不同层次土壤有机碳密度的变化特征与有机碳浓度相似,0~60cm有机碳密度最大值出现在北坡(33.64±0.91kg·m-2)及沟谷(34.30±2.55kg·m-2),约为南坡的3.20倍,西南坡的2.87倍、西坡的1.90倍。
[Abstract]:The effects of slope direction and position on soil organic carbon concentration and density in different depths were analyzed on the scale of slope scale with three hilltops in the forest steppe belt of Qilian Mountains. The change trend of organic carbon concentration in the back slope and the foot of the slope is the south slope of the southwest slope of the north slope and the west slope of the slope, but there is no significant difference in the soil organic carbon concentration in different gullies. The slope distribution of organic carbon concentration varies with the slope direction, in the south slope, the southwest slope and the west slope. The organic carbon concentrations in each layer of the gully were significantly higher than those in other slope positions (P 0.05) and at the foot of the slope were higher than those in the shoulder and the back slope, but there was no significant difference in organic carbon concentration in the north slope, the slope shoulder, the back slope and the foot of the slope. The soil organic carbon density of different soil layers is similar to that of soil organic carbon concentration. The maximum value of organic carbon density in the north slope is 33.64 卤0.91 kg 路m ~ (-2) and in the gully is 34.30 卤2.55 kg 路m ~ (-2), about 3.20 times of that in the south slope and 2.87 times in the southwest slope. 1.90 times the west slope.
【作者单位】：中国科学院寒区旱区环境与工程研究所内陆河流域生态水文重点实验室;中国科学院大学;甘肃省白龙江林业管理局林业科学研究所;西北师范大学地理与环境科学学院;
【基金】：国家自然科学基金项目(31270482)
【分类号】：S153.6

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