Abstract:
:The assessment of soil organic carbon (SOC) in mountainous karst areas is very challenging, due to the high spatial heterogeneity in SOC content and soil type. To study and assess the SOC storage in mountainous karst areas, a total of 22,786 soil samples were collected from 2,854 soil profiles in Guizhou Province in Southwest China. The SOC content in the soil samples was determined by the oxidation of potassium dichromate (K2Cr2O7), followed by titration with iron (II) sulfate (FeSO4). The SOC storage was assessed based on different land uses. The results suggested that the average SOC density in the top 1.00 m of soil associated with different land uses decreased in the following order: Croplands (9.58 kg m-2) > garden lands (9.07 kg m-2) > grasslands (8.07 kg m-2) > forestlands (7.35 kg m-2) > uncultivated lands (6.94 kg m-2). The SOC storage values in the 0.00-0.10 m, 0.00-0.20 m, 0.00-0.30 m and 0.00-1.00 m soil layers of Guizhou Province were 0.50, 0.87, 1.11 and 1.58 Pg, respectively. The SOC in the top 0.30 m of soil accounted for 70.25% of the total within the 0.00-1.00 m layer in Guizhou Province. It was concluded that assessing SOC storage in mountainous karst areas was more accurate when using land use rather than soil type. This result can supply a scientific reference for the accurate assessment of the SOC storage in the karst areas of southwestern China, the islands of Java, northern and central Vietnam, Indonesia, Kampot Province in Cambodia and in the general area of what used to be Yugoslavia, along with other karst areas with similar ecological backgrounds.
journal_name
Int J Environ Res Public Healthauthors
Zhang Z,Huang X,Zhou Y,Zhang J,Zhang Xdoi
10.3390/ijerph16214199subject
Has Abstractpub_date
2019-10-30 00:00:00issue
21eissn
1661-7827issn
1660-4601pii
ijerph16214199journal_volume
16pub_type
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