Effects of vegetation rehabilitation on soil organic and inorganic carbon stocks in the Mu Us Desert, northwest China

土壤碳 植被(病理学) 干旱 固碳 播种 环境科学 中国 总有机碳 碳纤维 土壤科学 农学 土壤水分 化学 环境化学 二氧化碳 材料科学 地理 生态学 生物 医学 有机化学 考古 复合材料 复合数 病理
作者
Yang Gao,Peng Dang,Qingxia Zhao,Jinliang Liu,Jiabin Liu
出处
期刊:Land Degradation & Development [Wiley]
卷期号:29 (4): 1031-1040 被引量:42
标识
DOI:10.1002/ldr.2832
摘要

Abstract In arid and semiarid areas, the importance of soil inorganic carbon (SIC) is at least as high as that of soil organic carbon (SOC) in affecting the regional carbon budget following vegetation rehabilitation. However, variations in SIC have been uncertain, and few studies have analyzed the interactions between the SOC and SIC pools. We measured SIC, SOC, δ 13 C‐SIC, and δ 13 C‐SOC after planting Mongolian pine (MP) and Artemisia ordosica (AO) on shifting sand land (SL) over 10 years in the Mu Us Desert , northwest China. The results showed that, compared to SL, SIC stocks at 0–100 cm in MP and AO lands significantly increased by 12.6 and 25.8 Mg ha −1 , respectively; SOC stocks in MP and AO lands significantly increased by 24.0 and 38.4 Mg ha −1 , respectively. Both δ 13 C‐SIC and δ 13 C‐SOC in the 2 plantation lands were significantly lower than those in SL were. All 315 samples exhibited a negatively linear relationship between SIC content and δ 13 C‐SIC ( R 2 = .70, p < .01) and showed positively linear relationships between SIC content and SOC content ( R 2 = .69, p < .01) and between δ 13 C‐SIC and δ 13 C‐SOC ( R 2 = .61, p < .01). The results demonstrated that vegetation rehabilitation on SL has a high potential to sequester SIC and SOC in semiarid deserts. The reduction in δ 13 C‐SIC and the relationship of SIC with δ 13 C‐SIC following vegetation rehabilitation suggested that SIC sequestration is likely caused by the formation of pedogenic inorganic carbon. The relationships between SIC and SOC and between δ 13 C‐SIC and δ 13 C‐SOC implied that the pedogenic inorganic carbon formation may be closely related to the SOC accumulation.
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