Changes in quantity and quality of dissolved organic carbon in purple soil

Roles of land use and soil depth

Bibliographic Data

ID21648955
AuthorsKe Liang (0000-0001-7271-9047, College of Resources and Environment Southwest University Chongqing PR China), Liang Ke (0009-0008-2954-1827, Southwest University), Yunfei Bi (College of Resources and Environment Southwest University Chongqing PR China), Binghui He (0009-0000-5599-5939, College of Resources and Environment Southwest University Chongqing PR China, corresponding author), Mengdie Feng (College of Resources and Environment Southwest University Chongqing PR China), Peidong Xi (College of Resources and Environment Southwest University Chongqing PR China), Tianyang Li (0000-0002-2913-5596, College of Resources and Environment Southwest University Chongqing PR China)
Year2023
Volume34
Issue2
Pages327-337
Publication date2023-01-30
Open AccessYes
TypeARTICLE
VenueLand Degradation and Development (JOURNAL)
Journal identifiersISSN: 1085-3278 • E-ISSN: 1099-145X
PublisherWiley (PUBLISHER • GB)
DOI10.1002/ldr.4461
OpenAlexW4294408484
LanguageEN
Citations received2
References cited44

Dissolved organic carbon (DOC) is the substrate for microbial activities and regulates the biogeochemical cycle of carbon. Considerable areas of croplands have been converted to secondary forest and economic plantation following the implementation of Grain‐for‐Green Program projects in China, markedly altering the quantity and quality of topsoil DOC. However, the extent and magnitude of these land use changes affecting soil DOC remain largely unclear. This study aimed to elucidate the effects of different land uses and soil depths on topsoil DOC quantity and quality. Soil samples were collected from secondary forest (SF), orchards/plantations (OP), and cropland (CL) at 0–5, 5–10, 10–15, and 15–20 cm soil depths, respectively, from a representative purple soil hillslope, Southwest China. Soil DOC concentration and related UV–visible absorbance characteristics were determined to assesss respectively the quantity and quality of DOC. Results showed that DOC concentration was 44% lower in the OP than in the SF and CL. Higher ratios of UV absorbance value at 254, 260, and 400 nm to DOC concentration (i.e., SUAV 254 , SUVA 260 , and C:C ratio), electronic conductivity (EC), cation exchange capacity (CEC), soil organic carbon (SOC), and total nitrogen (TN) concentration were found in the OP rather than in the SF and CL. The SUAV 254 , SUVA 260 , SOC, and TN concentration were the highest at 0–5 cm soil depth. DOC concentration showed negative relationships with most UV absorbance values, SUAV 254 , SUVA 260 , and C:C ratio. Soil EC, CEC, and pH were closely correlated with the DOC concentration and its UV–visible variables. Our results indicated that DOC was relatively richer in aromatic and humic substances in the OP, providing valuable information for sustainable ecological restoration and land use management

Absorbance · Biogeochemical cycle · Cation-exchange capacity · Dissolved organic carbon · Soil carbon · Soil pH · Soil Quality · Soil test · Soil water · Topsoil · Total organic carbon · Chemistry · Environmental Science · Marine and coastal ecosystems · Microbial Community Ecology and Physiology · Soil and Water Nutrient Dynamics · Environmental Chemistry · Soil Science

Tools

Open DOI