Distribution of Soil Organic Carbon at Hillslope Scale in Forest-steppe Zone of Qilian Mountains

Zhu Meng; Liu Wei; Qin Yanyan; Cao Jianjun; Li Huiya; Zhao Yu

doi:10.7522/j.issn.1000-694X.2015.00155

Journal of Desert Research >

2016 , Vol. 36 >Issue 3: 741 - 748

DOI: https://doi.org/10.7522/j.issn.1000-694X.2015.00155

Distribution of Soil Organic Carbon at Hillslope Scale in Forest-steppe Zone of Qilian Mountains

Zhu Meng ,
Liu Wei ,
Qin Yanyan ,
Cao Jianjun ,
Li Huiya ,
Zhao Yu

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1. Key Laboratory of Ecohydrology of Inland River Basin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Research Institute of Forestry Science of Bailongjiang Forestry Management Bureau, Lanzhou 730070, China; ;
4. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China

Received date: 2015-07-26

Revised date: 2015-09-29

Online published: 2016-05-20

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Abstract

This study examined the effect of slope aspects and positions on SOC concentration and density of different soil depths (0-10, 10-20, 10-20, 20-40,40-60 cm) in forest-steppe zone of Qilian Mountains. Results showed that SOC concentration of whole soil profile increased continuously from south, southwest, west to north-facing slopes at shoulderslope, backslope and footslope positions, while no significant differences were found among valleys. The distribution pattern of SOC concentration among slope positions varied with slope aspects. On south, southwest, and west-facing slopes, SOC concentration at valleys was significantly higher than other slope positions (P<0.05), and footslope position tended to be higher than shoulderslope and backslope positions. On north-facing slope, there was no significant difference among shoulderslope, backslope and footslope positions, and SOC concentration at 20-40 cm and 40-60 cm depths of valley was significantly lower than shoulderslope position (P<0.05). The distribution pattern of SOC density was similar to concentration. SOC density at 0-60 cm depth was maximal on north-facing slope (33.64±0.91 kg·m^-2) and valley (34.30±2.55 kg·m^-2), and was significantly larger than south, southwest and west-facing slopes by factors of 3.20, 2.87 and 1.90, respectively.

Key words： Qilian Mountains; slope aspects; slope positions; soil organic carbon

Cite this article

Zhu Meng , Liu Wei , Qin Yanyan , Cao Jianjun , Li Huiya , Zhao Yu . Distribution of Soil Organic Carbon at Hillslope Scale in Forest-steppe Zone of Qilian Mountains[J]. Journal of Desert Research, 2016 , 36(3) : 741 -748 . DOI: 10.7522/j.issn.1000-694X.2015.00155

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