甘肃河西山地土壤有机碳储量及分布特征

doi:10.7522/j.issn.1000-694X.2018.00067

摘要/Abstract

摘要： 山地土壤具有强异质性和较高的碳密度，研究山地土壤有机碳的储量、空间分布特征和影响因素，对理解未来气候变化情景下该区土壤碳-大气反馈具有重要意义。河西山地地形复杂，水热梯度明显，是研究土壤有机碳空间格局的理想区域。利用河西山地126个土壤剖面数据，分析了0~100 cm土壤有机碳的储量、空间分布特征及其与环境因素的关系。结果表明：河西山地0~100 cm土壤有机碳密度均值15.04±7.24 kg·m^-2，区域土壤有机碳储量1.37±0.66 Pg，其中50%储存在高寒草甸和亚高山灌丛草甸。研究区土壤有机碳密度从高到低依次为亚高山灌丛草甸（41.15±18.47 kg·m^-2）、山地草甸草原（40.26±9.59 kg·m^-2）、山地森林（34.57±14.52 kg·m^-2）、高寒草甸（29.19±14.58 kg·m^-2）、山地草原（19.28±11.33 kg·m^-2）、荒漠草原（9.83±4.14 kg·m^-2）、高寒草原（8.59±2.47 kg·m^-2）、高寒荒漠（5.89±3.18 kg·m^-2）、草原化荒漠（5.16±3.06 kg·m^-2）、温带荒漠（5.00±3.35 kg·m^-2）。土壤有机碳的空间分布与地形和气候因子显著相关。土壤有机碳密度随着海拔的升高呈现出先增加后减少的趋势，阴坡土壤有机碳密度显著高于阳坡和半阴坡。土壤有机碳密度随年平均降水量增多而增多，随年平均温度的升高呈现出先增加后减少的趋势。

关键词: 土壤有机碳, 空间分布, 植被类型, 河西山地

Abstract: Mountain soil has strong heterogeneity and high carbon density. Studying the storage, spatial distribution patterns and influencing factors of soil organic carbon in mountainous area is of great significance for understanding the soil carbon-atmosphere feedback under the future climate change scenarios. Mountainous areas in the Hexi Region are characterized by complex topography, large gradients of water and heat, thus an ideal area to study the pattern of soil organic carbon and its influencing factors. In this study, 126 soil profiles were used to investigate the storage and spatial distribution of 0-100 cm soil organic carbon and its relationship with environmental factors in mountainous areas in the Hexi Region in Gansu. The results showed that the average soil organic carbon density of 0-100 cm in mountainous areas in the Hexi Region was 15.04±7.24 kg·m^-2 and the area of soil organic carbon storage was 1.37±0.66 Pg, of which 50% was stored in alpine meadow and sub-alpine shrub meadow zone. Specifically, the soil organic carbon density in different vegetation types decreased as the following order:sub-alpine shrub meadow. In addition, the spatial distribution of soil organic carbon was significantly correlated with topography and climatic factors. Soil organic carbon tended to increase at first and then decrease with the elevation. The organic carbon density on the shady slopes was significantly higher than that on the sunny and semi-shady slopes. Soil organic carbon density increased with the annual mean precipitation. The relationships between soil organic carbon and mean annual temperature were characterized by an increasing trend at first, then an decreasing trend.

Key words: soil organic carbon, spatial distribution, vegetation type, mountainous areas in the Hexi Region

中图分类号:

S153.6

张梦旭, 刘蔚, 朱猛, 李若麟. 甘肃河西山地土壤有机碳储量及分布特征[J]. 中国沙漠, 2019, 39(4): 64-72.

Zhang Mengxu, Liu Wei, Zhu Meng, Li Ruolin. Soil Organic Carbon Storage and Distribution Patterns in the Mountainous Areas of the Hexi Region, Gansu, China[J]. Journal of Desert Research, 2019, 39(4): 64-72.

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