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Vertical distribution and storage of soil organic and inorganic carbon in a typical inland river basin, Northwest China


Knowledge of soil carbon (C) distribution and its relationship with the environment can improve our understanding of its biogeochemical cycling and help to establish sound regional models of C cycling. However, such knowledge is limited in environments with complex landscape configurations. In this study, we investigated the vertical distribution and storage of soil organic carbon (SOC) and soil inorganic carbon (SIC) in the 10 representative landscapes (alpine meadow, subalpine shrub and meadow, mountain grassland, mountain forest, typical steppe, desert steppe, Hexi Corridor oases cropland, Ruoshui River delta desert, Alxa Gobi desert, and sandy desert) with contrasting bioclimatic regimes in the Heihe River Basin, Northwest China. We also measured the 87Sr/86Sr ratio in soil carbonate to understand the sources of SIC because the ratio can be used as a proxy in calculating the contribution of pedogenic inorganic carbon (PIC) to total SIC. Our results showed that SOC contents generally decreased with increasing soil depth in all landscapes, while SIC contents exhibited more complicated variations along soil profiles in relation to pedogenic processes and parent materials at the various landscapes. There were significant differences of C stocks in the top meter among different landscapes, with SOC storage ranging from 0.82 kg C/m2 in sandy desert to 50.48 kg C/m2 in mountain forest and SIC storage ranging from 0.19 kg C/m2 in alpine meadow to 21.91 kg C/m2 in desert steppe. SIC contributed more than 75% of total C pool when SOC storage was lower than 10 kg C/m2, and the proportion of PIC to SIC was greater than 70% as calculated from Sr isotopic ratio, suggesting the critical role of PIC in the C budget of this region. The considerable variations of SOC and SIC in different landscapes were attributed to different pedogenic environments resulted from contrasting climatic regimes, parent materials and vegetation types. This study provides an evidence for a general trade-off pattern between SOC and SIC, showing the compensatory effects of environmental conditions (especially climate) on SOC and SIC formation in these landscapes. This is largely attributed to the fact that the overall decrease in temperature and increase in precipitation from arid deserts to alpine mountains simultaneously facilitate the accumulation of SOC and depletion of SIC.
Download Comment From cooperative journals:《Journal of Arid Land》 Hits:12570 Downloads:1387
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1 论文以黑河流域中10个不同生态系统为例,研究了中国东北部干旱和半干旱地区土壤剖面碳库(有机碳和无机碳)的变化和组成特征,最后结合植被分布,气候变化特点等进一步研究了驱动黑河流域土壤碳库中有机碳和无机碳分布机理。该研究表明:1.在干旱地区,土壤无机碳含量占土壤总碳的70%左右。2.有机碳的分布主要受植被的分布影响,而无机碳主要受土壤母质和气候的影响。通过这篇文章,我们了解到在该地区的土壤碳研究中,研究人员要关注无机碳的研究。最重要的,弄清楚该地区土壤碳库变化特征和驱动机理,有助给于当地土壤管理提供科学依据。 (Comment time:2018-10-18 20:45:26,From: ,0 )
Recommended references: YANG Fan,HUANG Laiming,YANG Renmin,YANG Fei,LI Decheng,ZHAO Yuguo,YANG Jinling,LIU Feng,ZHANG Ganlin.(2018).Vertical distribution and storage of soil organic and inorganic carbon in a typical inland river basin, Northwest China.Journal of Arid Land.[ChinaXiv:201801.00773] (Click&Copy)
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[V1] 2018-01-29 12:23:50 chinaXiv:201801.00773V1 Download
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