文献类型： 外文期刊
作者： Liu, Shangshi 1 ; Zhou, Luhong 1 ; Li, He 1 ; Zhao, Xia 1 ; Yang, Yuanhe 1 ; Zhu, Yankun 1 ; Hu, Huifeng 1 ; Chen, Leiyi; 1 ;
作者机构： 1.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Peking Univ, Inst Ecol, Coll Urban & Environm, Beijing, Peoples R China
4.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing, Peoples R China
5.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot, Peoples R China
关键词： carbon budget; carbon source; shrub encroachment; soil acidification; soil inorganic carbon; temperate grassland
期刊名称：JOURNAL OF ECOLOGY （ 影响因子：6.256； 五年影响因子：7.125 ）
ISSN： 0022-0477
年卷期：
页码：
收录情况： SCI
摘要： Widespread shrub encroachment in global drylands may increase plant biomass and change soil organic carbon stocks of grassland ecosystems. However, the response of soil inorganic carbon (SIC), which is a major component of dryland carbon pools, to this vegetation shift remains unknown. We conducted a systematic field survey in 75 pairs of shrub-encroached grassland (SEG) and control plots at 25 sites in the grasslands of the Inner Mongolia Plateau to evaluate how shrub encroachment affects SIC density (SICD) in these ecosystems. We found that shrub encroachment significantly reduced SICD in the upper 100 cm (3.85 vs. 4.74 kg C m(-2), p < .05), especially in the subsurface soil (20-50 cm layer). The magnitude of SICD changes was related to the change in soil pH, shrub patch size and initial SICD, reflecting that the reduction in SICD might be attributed to the shrub encroachment-related soil acidification. Our results also revealed that the lost SIC was mainly released into the atmosphere rather than redistributed into deeper soil layers. Synthesis. We provide the first evidence for the soil acidification-induced SIC loss caused by shrub encroachment. Our findings highlight the non-negligible role of SIC dynamics in the C budget of SEG ecosystems and the need to consider these dynamics in terrestrial C cycle research.
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