湖南省水稻土有机碳剖面分布特征及影响因素  

Profile Distribution Characteristics of Paddy Soil Organic Carbon and Its Influencing Factors in Hunan Province

作　　者：沈璇玚 段良霞 欧阳宁相 盛浩[1] 袁红[1] 张亮[1] 张扬珠[1] 周清[1] 谢红霞[1] SHEN Xuan-yang;DUAN Liang-xia;OUYANG Ning-xiang;SHENG Hao;YUAN Hong;ZHANG Liang;ZHANG Yang-zhu;ZHOU Qing;XIE Hong-xia(College of Resources and Environment,Hunan Agricultural University,Changsha 410000,China;College of Engineering Management,Hunan University of Finance and Economics,Changsha 410000,China)

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410000 [2]湖南财政经济学院工程管理学院,湖南长沙410000

出　　处：《土壤通报》2024年第1期84-92,共9页Chinese Journal of Soil Science

基　　金：国家科技基础性工作专项项目课题(2014FY110200)资助。

摘　　要：【目的】按土壤剖面发生层分析水稻土有机碳剖面分布特征及其影响因素。【方法】通过测定湖南省58个水稻土剖面各发生层土壤有机碳含量,分析水稻土剖面有机碳分布特征,并利用地理探测器解析水稻土有机碳含量空间分异的影响因素。【结果】①湖南省水稻土剖面土壤有机碳平均含量为9.30 g kg^(−1),其在发生层上的分布表现为耕作层(22.94 g kg^(−1))>犁底层(15.09 g kg^(−1))>底土层(6.93 g kg^(−1))。②不同成土母质发育的土壤中,石灰岩风化物发育的水稻土发生层有机碳含量最大;不同质地的土壤中,水稻土各类发生层有机碳含量整体上表现为随粉粒含量的增加而增大。③各发生层有机碳空间分布均呈现西南高,东北低的格局。④地理探测器结果显示,容重对各发生层水稻土有机碳含量空间分异解释程度最高,且与其他因子交互之后解释力显著增强。【结论】湖南省水稻土有机碳含量在不同剖面发生层存在显著性差异,其空间分布是由多因子交互作用形成的,容重对各发生层有机碳解释力最高。[Objective]This study aims to analyze the distribution characteristics of soil organic carbon(SOC)in paddy soil profile and its influencing factors according to the genetic horizon.[Method]By measuring SOC content in each occurrence layer of 58 paddy soil profiles in Hunan Province,the SOC distribution characteristics in the occurrence layer of paddy soil profiles were determined,and to further identify the factors influencing the spatial variation.[Result]①The average SOC content in the entire paddy soil profile was 9.30 g kg^(−1),in the genetic horizon,the cultivated horizon had the greatest content,with the average of 22.94 g kg^(−1),followed by plow pan and subsoil layer,with the averages of 15.09 g kg^(−1) and 6.93 g kg^(−1).②Among the different soil parent material,the paddy soil developed from the weathering product of limestone had the largest SOC in each generation layer.For different textures,the overall performance of SOC in each genetic horizon increased with an increase in proportion of silt.③Kriging interpolation analysis indicated that the SOC of each genetic horizon had high and low values in the southwest and low in the northeast,respectively.④Geographic detector showed that the soil bulk density generally exhibited the greatest explanatory power in each genetic horizon.Furthermore,the interaction forces between the soil bulk density and other factors were clearly strengthened.[Conclusion]Significant differences in SPC content in paddy soils at teach genetic horizon of the profile.The spatial distribution of SOC in paddy soils is shaped by the interaction of multiple factors,and bulk density showed the most significant explanatory power for the SOC in genetic horizon.

关 键 词：土壤有机碳 发生层 成土母质 质地 地理探测器 

分 类 号：S155[农业科学—土壤学]