Abstract：[Background] The stability of soil aggregates, the basic units of soil structure, is a key property for many soil ecological processes and functions such as soil and water conservation and soil carbon sequestration potential. The stability of aggregates is strongly correlated with labile carbon, and soil aggregation is mainly affected by labile organic carbon. The periglacial landform of eastern Liaoning is experiencing severe soil erosion and loss of soil fertility due to its special geological conditions. This study aims to reveal the stability of soil carbon and its regulation mechanism. [Methods] In June 2019, about 1 kg of undisturbed soil blocks were collected at depths of 0-10 cm at 4 vegetation types(mid-mountain grassland, natural secondary forest, larch plantation and riparian grassland) according to elevations in periglacial landforms in the mountain areas of eastern Liaoning. Aggregate distribution and stability were determined using dry-sieving methods: 2.000, 1.000, 0.250 and 0.038 mm mesh sieves from top to bottom. After separation, the fractions of the aggregates were dried at 60 ℃ and then weighed. SOC(soil organic carbon) was determined by the digestion method with K2Cr2O7-H2SO4. Labile organic carbon was determined by the oxidation of 333 mmol/L KMnO4. [Results] The content of labile organic carbon in the soil aggregates with particle size >2.000, >1.000-2.000 and >0.250-1.000 mm of different vegetation types was basically the same, showing the following order: mid-mountain grassland > natural secondary forest > larch plantation > riparian grassland, decreasing with altitude. The contribution rate of soil aggregate liable organic carbon decreased with aggregate size in mid-mountain grassland, natural secondary forest and larch plantation. Nevertheless, the contribution rate of labile organic carbon within aggregate size >0.25 mm was higher, and the contribution rate of >0.038-0.250 mm was lower. The linearly positive correlation was found between content of the soil aggregate labile organic carbon and total organic carbon. And the correlation between soil aggregate labile organic carbon and total organic carbon was more significant at the larger size. Soil aggregate organic carbon, labile organic carbon and non-labile organic carbon were positively correlated with vegetation coverage, litter biomass, root biomass and Eh, and negatively correlated with soil total nitrogen, bulk density, pH and water content. [Conclusions] The characteristics of liable organic carbon in soil aggregates are mainly affected by vegetation characteristics, and soil physical and chemical characteristics were caused by vegetation type and temperature change-driven elevational changes. Therefore, more attentions should be paid to the impact of vegetation change and climate warming on soil carbon pool of periglacial landform in eastern Liaoning. The results of this study may provide a reference for the regulation of soil carbon pool stability in periglacial landforms in the mountain areas of eastern Liaoning.
王琼, 范志平, 陈寒, 韩青, 李新仓, 李一凡. 辽东冰缘地貌表层土壤团聚体活性有机碳分布特征[J]. 中国水土保持科学, 2023, 21(6): 23-31.
WANG Qiong, FAN Zhiping, CHEN Han, HAN Qing, LI Xincang, LI Yifan. Distribution characteristics of labile organic carbon in the soil aggregate in periglacial landforms of eastern Liaoning. SSWC, 2023, 21(6): 23-31.
徐香茹,汪景宽.土壤团聚体与有机碳稳定机制的研究进展[J].土壤通报,2017,48(6):7.XU Xiangru,WANG Jingkuan.A review on different stabilized mechanisms of soil aggregates and organic carbon[J].Chinese Journal of Soil Science,2017,48(6):7.
[2]
SIX J,ELLIOTT E T,PAUSTIAN K.Soil macroaggregate turnover and microaggregate formation:A mechanism for C sequestration under no tillage agriculture [J].Soil Biology and Biochemistry,2000,32(14):2099.
[3]
LI X Q,VOGELER I,SCHWENDENMANN L.Soil aggregation and soil fraction associated carbon under different vegetation types in a complex landscape[J].Soil Research,2019,57(3):215.
[4]
POST W M,KWON K C.Soil carbon sequestration and land-use change:Processes and potential[J].Global Change Biology,2000,6(3):317.
[5]
CHEN Yuanqi,ZHANG Yu,YU Shiqin,et al.Responses of soil labile organic carbon and water-stable aggregates to reforestation in southern subtropical China[J].Journal of Plant Ecology,2020,14(2):191.
[6]
李睿,江长胜,郝庆菊.缙云山不同土地利用方式下土壤团聚体中活性有机碳分布特征[J].环境科学,2015,36(9):3429.LI Rui,JIANG Changsheng,HAO Qingju.Impact of land utilization pattern on distributing characters of labile organic carbon in soil aggregates in Jinyun Mountain [J].Environmental Science,2015,36(9):3429.
[7]
华娟,赵世伟,张扬,等.云雾山草原区不同植被恢复阶段土壤团聚体活性有机碳分布特征[J].生态学报,2009,29(9):4613.HUA Juan,ZHAO Shiwei,ZHANG Yang,et al.Distribution characteristics of labile organic carbon in soil aggregates in different stages of vegetation restoration of grassland in Yunwu Mountain[J].Acta Ecologica Sinica,2009,29(9):4613.
[8]
沈玉娟,赵琦齐,冯育青,等.太湖湖滨带土壤活性有机碳沿水分梯度的变化特征[J].生态学杂志,2011,30(6):1119.SHEN Yujuan,ZHAO Qiqi,FENG Yuqing,et al.Variation characteristics of soil active organic carbon along a soil moisture gradient in a riparian zone of Taihu Lake[J].Chinese Journal of Ecology,2011,30(6):1119.
[9]
WITZGALL K,VIDAL A,SCHUBERT D,et al.Particulate organic matter as a functional soil component for persistent soil organic carbon[J].Nature Communications,2021,12(1):4115.
[10]
WEI Hui,CHEN Xiaomei,KONG Mimi,et al.Three-year-period nitrogen additions did not alter soil organic carbon content and lability in soil aggregates in a tropical forest[J].Environmental Science and Pollution Research,2021,28(28):37793.
[11]
廖洪凯,龙健,李娟.不同小生境对喀斯特山区花椒林表土团聚体有机碳和活性有机碳分布的影响[J].水土保持学报,2012,26(1):156.LIAO Hongkai,LONG Jian,LI Juan.Effect of different micro-habitats types on organic carbon and labile organic carbon distribution in surface soil aggregates in Chinese prickly Ash Orchard of Karst Mountain area[J].Journal of Soil and Water Conservation,2012,26(1):156.
[12]
梁彩群,刘国彬,王国梁,等.黄土高原人工刺槐林土壤团聚体中不同活性有机碳从南到北的变化特征[J].环境科学学报,2020,40(3):1095.LIANG Chaiqun,LIU Guobin,WANG Guoliang,et al.Variation characteristics of different labile organic carbon in soil aggregates of Robinia pseudoacacia plantation from south to north in the Loess Plateau[J].Acta Scientiae Circumstantiae,2020,40(3):1095.
[13]
景航,刘国彬,王国梁,等.恢复措施对皆伐油松林团聚体活性有机碳含量的影响:以黄土丘陵区松峪沟流域为例[J].中国水土保持科学,2017,15(1):113.JING Hang,LIU Guobin,WANG Guoliang,et al.Effects of restoration measure on labile organic carbon in aggregates after clear-cutting Chinese pine forest:A case study of Songyugou Watershed of the Loess Plateau[J].Science of Soil and Water Conservation,2017,15(1):113.
[14]
NDZELU B S,DOU S,ZHANG X W.Corn straw return can increase labile soil organic carbon fractions and improve water-stable aggregates in Haplic Cambisol[J].Journal of Arid Land,2020,12(6):1018.
[15]
马志良,赵文强.植物群落向土壤有机碳输入及其对气候变暖的响应研究进展[J].生态学杂志,2020,39(1):270.MA Zhiliang,ZHAO Wenqiang.Research progress on input of plant community-derived soil organic carbon and its responses to climate warming[J].Chinese Journal of Ecology,2020,39(1):270.
[16]
刘剑刚,张华,伏捷,等.辽东山地老秃顶子冰缘地貌特征及其环境意义[J].冰川冻土,2014,36(6):1420.LIU Jiangang,ZHANG Hua,FU Jie,et al.Periglacial landforms in the Mt.Laotudingzi of eastern Liaoning province:Characteristics and environmental significance[J].Journal of Glaciology and Geocryology,2014,36(6):1420.
[17]
CAO Sheng,ZHOU Yuzhou,ZHOU Yaoyu,et al.Soil organic carbon and soil aggregate stability associated with aggregate fractions in a chronosequence of citrus orchards plantations[J].Journal of Environmental Management,2021,293:112847.
[18]
GUIDI P,FALSONE G,WILSON C,et al.New insights into organic carbon stabilization in soil macroaggregates:An in situ study by optical microscopy and SEM-EDS technique[J].Geoderma,2021,397:115101.
[19]
王春燕,何念鹏,吕瑜良.中国东部森林土壤有机碳组分的纬度格局及其影响因子[J].生态学报,2016,36(11):3176.WANG Chunyan,HE Nianpeng,LÜ Yuliang.Latitudinal patterns and factors affecting different soil organic carbon fractions in the eastern forests of China[J].Acta Ecologica Sinica,2016,36(11):3176.
[20]
SEQUEIRA C H,ALLEY M M,JONES B P.Evaluation of potentially labile soil organic carbon and nitrogen fractionation procedures[J].Soil Biology and Biochemistry,2011,43(2):438.
[21]
LIDDLE K,MCGONIGLE T,KOITER A.Microbe biomass in relation to organic carbon and clay in soil[J].Soil Systems,2020,4(3):41.
2023, Vol. 21 
