Objective To explore the changes in soil organic matter in the short term during vegetation restoration in bauxite mining areas and their driving factors, in order to provide basic data for rapidly increasing soil organic carbon in mining areas. Methods Taking a typical bauxite mining area in Guizhou Province as the research area, we analyzed soil environment, soil organic carbon and its active organic carbon components (particulate organic carbon, POC; readily oxidizable organic carbon, ROC; light fraction organic carbon, LFOC), carbon pool management index (CPMI), and the factors driving changes in soil organic carbon and its active components during the short term of vegetation restoration (recovery years include the current year, 1 year, 2 years and 3 years). Results 1) Soil organic carbon content in the bauxite mining area was low, ranging from 13.781 to 24.566 g/kg, with the proportion of readily oxidizable organic carbon to total organic carbon increasing with the recovery years. 2) Compared to the current year of recovery, short-term vegetation restoration significantly increased the carbon pool management index, with specific values ranked in the order of 3 years (39.46)>1 year (38.88)>2 years (32.26)>current year (16.65). 3) Redundancy analysis showed that soil pH and bacterial community richness explained 40.2% and 22.8% of the variation in the content of organic carbon and its active organic carbon components, respectively. Conclusion During the short term of vegetation restoration in bauxite mining areas, readily oxidizable organic carbon is an important indicator of soil carbon pool, short-term vegetation restoration has increased the carbon pool management index, and the main factors influencing changes in soil organic carbon and its active organic carbon components are pH and bacterial richness.
LIJ C, WANGX, YUEJ Y, et al. Evaluation on soil ecologic fertility during vegetation succession in Antaibao open pit[J].Research of Soil and Water Conservation,2015,22(1):66-71.
[4]
LALR. Soil carbon sequestration impacts on global climate change and food security[J].Science,2004,304(5677):1623-1627.
LIUR J, WUY C, ZHANGY, et al. Comparison of soil labile organic carbon in Chinese fir plantations and natural secondary forests in north subtropical areas of China[J].Chinese Journal of Plant Ecology,2012,36(5):431-437.
ZHAOY, ZHANGW, HUP L, et al. Responses of soil organic carbon fractions to different vegetation restoration in a typical karst depression[J].Acta Ecologica Sinica,2021,41(21):8535-8544.
WANGD F, DONGL B, LIA, et al. Soil organic carbon and moisture effects of different vegetation restoration types in the Mu us sandy land[J].Journal of Soil and Water Conservation,2024,38(3):101-110.
ZHANGS L, SHENGM Y, WANGL J, et al. Effects of long term vegetation restorations on soil organic carbon fractions in the karst rocky desertification ecosystem, southwest China[J].Acta Ecologica Sinica,2023,43(20):8476-8492.
[13]
FANGX, ZHAOL, ZHOUG Y, et al. Increased litter input increases litter decomposition and soil respiration but has minor effects on soil organic carbon in subtropical forests[J].Plant and Soil,2015,392(1):139-153.
[14]
CONANTR T, STEINWEGJ M, HADDIXM L, et al. Experimental warming shows that decomposition temperature sensitivity increases with soil organic matter recalcitrance[J].Ecology,2008,89(9):2384-2391.
[15]
FONTAINES, MARIOTTIA, ABBADIEL. The priming effect of organic matter: A question of microbial competition?[J].Soil Biology and Biochemistry,2003,35(6):837-843.
ZHANGZ M, HAOG C. Short-term effect of slope direction on soil organic carbon recovery of highway slope[J/OL].China Industrial Economics,2024:1-12.(2024-05-07).
LIQ Y, WENGB L, LIZ X, et al. Soil physicochemical characteristics and microbial evolution during vegetation restoration in ionic rare earth ore heap leaching waste land[J].China Environmental Science,2019,39(10):4360-4368.
[22]
鲍士旦.土壤农化分析[M].北京:中国农业出版社,2000.
[23]
BAOS D. Soil and agricultural chemistry analysis[M].Beijing: China Agriculture Press,2000.
[24]
CAMBARDELLAC A, ELLIOTTE T. Particulate soil organic-matter changes across a grassland cultivation sequence[J].Soil Science Society of America Journal,1992,56(3):777-783.
[25]
JANZENH H, CAMPBELLC A, BRANDTS A, et al. Light-fraction organic matter in soils from long-term crop rotations[J].Soil Science Society of America Journal,1992,56(6):1799-1806.
[26]
BLAIRG J, LEFROYR, LISLEL. Soil carbon fractions based on their degree of oxidation, and the development of a carbon management index for agricultural systems[J].Australian Journal of Agricultural Research,1995,46(7):e1459.
LIB, WANGJ M, WANGH D, et al. Progress on measurement and factors of soil organic carbon in mineral area[J].Soils,2016,48(3):434-441.
[29]
HORSTW J, WANGY X, ETICHAD. The role of the root apoplast in aluminium-induced inhibition of root elongation and in aluminium resistance of plants: A review[J].Annals of Botany,2010,106(1):185-197.
WANGY N, XUZ W, WANGS Z. Concentrations of active organic carbon components in soils in Baijianghe natural and drained peat bogs and their influencing factors[J].Wetland Science,2021,19(6):691-701.
HUANGY Y, QUL Y, QUX C, et al. Soil microbial community characteristics under different vegetation types at the Holocene-basalt Platform, Jingpo Lake area, northeast China[J].Acta Ecologica Sinica,2012,32(9):2827-2836.
CHENJ Q, JIAY N, HEQ F, et al. Effect of land use on the stability of soil organic carbon in a karst region[J].Environmental Science,2024,45(1):335-342.
[36]
GRYBOSM, DAVRANCHEM, GRUAUG, et al. Increasing pH drives organic matter solubilization from wetland soils under reducing conditions[J].Geoderma,2009,154(1/2):13-19.
[37]
XUC, KUANGS P, HEL, et al. Effects of changing restoration years on soil nutrient traits and plant community diversity in a phosphate mining area[J].Forests,2023,14(7):e1468.
[38]
FINND, KOPITTKEP M, DENNISP G, et al. Microbial energy and matter transformation in agricultural soils[J].Soil Biology and Biochemistry,2017,111:176-192.
YUANJ H, RENQ, ZHOUL Y, et al. Characteristics and influencing factors of soil organic carbon components under different environmental conditions in Poyang Lake wetland[J].Chinese Journal of Ecology,2023,42(6):1323-1329.
ZHUH Y, WANGZ F, LUC, et al. Variation characteristics of soil active organic carbon and carbon pools under five vegetation types in Jinyun Mountain[J].Soils,2021,53(2):354-360.
[45]
赵敏.喀斯特区不同植被类型对土壤有机碳及其活性组分的影响[D].贵阳:贵州大学,2023.
[46]
ZHAOM. Effects of different vegetation types on soil organic carbon and its active components in karst area[D].Guiyang: Guizhou University,2023.
[47]
ZHANGX X, WANGL J, ZHOUW X, et al. Changes in litter traits induced by vegetation restoration accelerate litter decomposition in Robinia pseudoacacia plantations[J].Land Degradation and Development,2022,33(1):179-192.
[48]
EZEOKOLIO T, BEZUIDENHOUTC C, MABOETAM S, et al. Structural and functional differentiation of bacterial communities in post-coal mining reclamation soils of South Africa: Bioindicators of soil ecosystem restoration[J].Scientific Reports,2020,10(1):e1759.