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[1]WANG Fei,MA Ruihao,XIA Kai,et al.Response of Soil Labile Organic Carbon Fractions to Forest Conversions[J].Research of Soil and Water Conservation,2023,30(01):233-240.[doi:10.13869/j.cnki.rswc.2023.01.021]

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Response of Soil Labile Organic Carbon Fractions to Forest Conversions

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 233-240 Column: Public date: 2023-01-10

Title:: Response of Soil Labile Organic Carbon Fractions to Forest Conversions

Author(s):: WANG Fei, MA Ruihao, XIA Kai, WEN Zhengyu, XU Xiaoniu; (School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036, China)

Keywords:: forest conversion; stand type; soil organic carbon; labile organic carbon

CLC:: S714.2

DOI:: 10.13869/j.cnki.rswc.2023.01.021

Abstract:: In order to study the effect of forest type conversion on soil active organic carbon components, three forest types, Pinus massoniana secondary forest, P. ellimattii plantation and Cunninghamia lanceolata plantation, were selected in Caijiaqiao Forest Farm in southern Anhui Province. The samples were collected from soil depths of 0—10 cm, 10—30 cm and 30—50 cm, respectively. The soil organic carbon(SOC), particulate organic carbon(POC), easily-oxidized organic carbon(EOC), microbial biomass carbon(MBC), dissolved organic carbon(DOC)and physicochemical properties were determined. The change characteristics of soil organic carbon components after forest type transformation and their relationship with soil physicochemical factors were analyzed. The results showed that:(1)the conversion of P. massonensis secondary forest to P. elliottii plantation and C. lanceolata plantation mainly affected the soil active organic carbon components in 0—10 cm soil layer; the SOC, POC and EOC contents in soil decreased after the conversion, and DOC content increased, while MBC had no significant differences before and after the conversion;(2)after forest type conversion, the proportion of POC to SOC in each soil layer decreased, while the proportions of DOC and EOC to SOC increased; the proportion of MBC to SOC did not show obvious regularity;(3)there were significant positive correlations between SOC and active carbon components, as well as TN, EC, NH⁺₄-N and NO^-₃-N, and there were also extremely significant positive correlations among the labile organic carbon fractions. From what has been discussed above, the conversion of P. massoniana secondary forest to P. elliottii plantation and C. lanceolata plantation mainly resulted in SOC loss and its stability decrease in surface soil layer, had little effect on SOC and its active components in the deep soil layer due to the comprehensive effects of such factors as different forest types, microbial activities and management interferences.

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Last Update: 2023-01-10