文献类型：期刊文献

中文题名：木质素酚类物质对内蒙古退化草地土壤有机碳的影响

英文题名：Influence of lignin phenols on soil organic carbon in degraded grassland in Nei Mongol,China

作者：杜淑辉[1] 褚建民[2] 段俊光[2] 薛建国[3] 徐磊[4] 徐晓庆[2] 王其兵[3] 黄建辉[3] 张倩[2]

第一作者：杜淑辉

机构：[1]山西农业大学林学院,山西太谷030800;[2]中国林业科学研究院林业研究所,北京100091;[3]中国科学院植物研究所植被与环境变化国家重点实验室,国家植物园,北京100093;[4]乌鲁木齐种苗场,乌鲁木齐830013

年份：2025

卷号：49

期号：1

起止页码：30-41

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

收录：;北大核心:【北大核心2023】；

基金：中国科学院战略性先导科技专项(A类)(XDA26020102)。

语种：中文

中文关键词：草原生态学;退化草地;木质素酚类;苯环开环;土壤有机碳;退化因子解析

外文关键词：grassland ecology;degraded grassland;lignin phenols;benzene ring opening;soil organic carbon;degradation factor analysis

分类号：S15

摘要：退化草地土壤有机碳流失与积累的影响因素亟需深入研究。植物残体来源的木质素酚类物质是土壤有机碳的重要组成部分,苯环开环导致的木质素酚类物质分解是否是退化草地土壤有机碳流失的重要过程,尚未见研究报道。该研究针对内蒙古锡林郭勒典型草原4个退化阶段草地,测定了土壤中木质素酚类物质含量、苯环开环关键功能基因(邻苯二酚-1,2-双加氧酶基因,cat A)丰度和分解产物(顺,顺-已二烯二酸)丰度,分析了其沿退化梯度的变化规律及其与土壤有机碳含量的关系。主要结果:1)与未退化草地相比,轻、中、重度退化草地土壤木质素酚类物质含量均显著降低,且随退化程度加剧呈下降趋势,木质素酚类物质含量与土壤有机碳含量呈显著正相关关系;2)cat A基因丰度在退化草地中显著升高,顺,顺-已二烯二酸丰度在中、重度退化草地显著高于轻度和未退化草地;3)相关性分析结果表明,cat A基因丰度和顺,顺-已二烯二酸丰度显著正相关,而木质素酚类物质含量与cat A基因丰度显著负相关,cat A基因丰度和顺,顺-已二烯二酸丰度均与土壤有机碳含量显著负相关。该研究发现,在样地尺度上,苯环开环导致的木质素酚类物质分解可以用于解释内蒙古退化草地土壤有机碳含量的变化,土壤木质素酚类物质降解是土壤有机碳流失的重要原因。该研究有望为退化草原土壤有机碳流失、积累特征及驱动机制研究提供新的视角,为退化草原恢复提供一定的理论依据。
Aims The influencing factors on the loss and accumulation of soil organic carbon in degraded grasslands need to be clarified.The lignin phenols derived from plant are important composition of soil organic carbon,and the decomposition of lignin phenols caused by benzene ring opening is an important process of soil organic carbon loss in degraded grasslands,however,studies on this point are not fully understood.Methods Soil samples were collected in four degradation severities of typical grasslands in Xilin Gol,Nei Mongol.The content of lignin phenolic and the abundance of the key functional gene for benzene ring opening,catechol-1,2-dioxygenase gene(catA),and product(cis,cis-muconic acid)were measured.And variations of lignin phenols and the abundance of catA gene along the degradation gradient and their correlation with soil organic carbon content were also analyzed.Important findings The results showed that 1)compared to the non-degraded grasslands,the content of lignin phenols in the soil of light,medium,and severe degraded grasslands decreased significantly,and showed a decreasing trend with increasing degradation.The content of lignin phenols showed the same pattern withsignificantly positively correlation with soil organic carbon content.2)The abundance of catA gene significantlyincreased in degraded grasslands,and the abundance of its decomposition product cis,cis-muconic acid wassignificantly higher in moderate and severe degradation compared to that in the light and non-degradationgrasslands.3)The abundance of catA gene was significantly positively correlated with the abundance ofcis,cis-muconic acid,while the content of lignin phenols was significantly negatively correlated with theabundance of catA gene.The abundance of catA gene and cis,cis-muconic acid were both significantly negativelycorrelated with soil organic carbon content.The results showed that,at the sample site scale,the decomposition oflignin phenols caused by benzene ring opening could be a potential mechanism in explaining the changes in soilorganic carbon content in degraded typical grasslands in Nei Mongol.Thus,our results are expected to provide anew perspective for the driving mechanism of soil organic carbon loss and accumulation in degraded grasslands,and thereby providing a certain theoretical basis for the restoration of degraded grasslands.