氮添加对土壤可溶性有机碳和微生物生物量碳的影响:基于Meta分析  

Effect of Nitrogen Addition on Soil Dissolved Organic Carbon and Microbial Biomass Carbon:A Meta-analysis

作　　者：裴志福 红梅 尚星玲 沈钦国 郑飞宇 PEI Zhifu;HONG Mei;SHANG Xingling;SHEN Qinguo;ZHENG Feiyu(Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources,College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古自治区土壤质量与养分资源重点实验室,农业生态安全与绿色发展自治区高等学校重点实验室,呼和浩特010018

出　　处：《土壤》2024年第5期1129-1136,共8页Soils

基　　金：国家重点研发计划项目(2018YFD0800802)资助。

摘　　要：通过收集氮添加条件下土壤可溶性有机碳(DOC)、微生物生物量碳(MBC)以及相关环境因子数据,共纳入86篇文献和1910对观测数据,运用Meta分析方法量化了土壤DOC和MBC对氮输入的响应及其潜在的驱动过程。结果显示:氮输入显著改变土壤化学性质,促进植物地上和地下生物量增加,显著降低土壤微生物生物量(包括真菌、细菌及放线菌);土壤DOC和MBC对氮输入响应并不一致,氮输入显著提高土壤DOC(7.48%),显著降低土壤MBC(4.03%),随试验地点累积氮输入量的增加,土壤DOC显著增加,土壤MBC显著降低。随机森林预测结果表明,氮添加条件下地上生物量和pH是DOC最重要的预测因子,而p H、总微生物生物量和真菌生物量是MBC最重要的预测因子。综上可见,氮输入条件下土壤DOC增加主要与植物源碳输入增加有关,而土壤MBC的下降则由于氮富集对微生物生长的抑制作用,这可能与土壤pH显著下降有关。氮输入对土壤DOC和MBC的不同驱动途径是导致其表现出差异化响应的根本原因。In this study,the data of soil dissolved organic carbon(DOC),microbial biomass carbon(MBC)and related environmental factors under nitrogen addition conditions were collected from a total of 86 literatures,and 1910 pairs of observation data were obtained to quantify the responses of soil DOC and MBC to nitrogen input and their potential driving processes by the method of meta analysis.The results showed that nitrogen input significantly altered soil chemical properties,promoted the increases in plant aboveground and underground biomass,and significantly reduced soil microbial biomass(including fungi,bacteria,and actinomycetes).The responses of soil DOC and MBC to nitrogen input were not consistent.Nitrogen input significantly increased soil DOC(7.48%)and significantly reduced soil MBC(4.03%).With the increase of accumulated nitrogen input at the experimental site,soil DOC significantly increased but soil MBC significantly decreased.The results of random forest prediction indicated that aboveground biomass and soil pH were the most important predictive factors for DOC under nitrogen addition conditions,while soil pH,total microbial biomass,and fungal biomass were the most important predictive factors for MBC.In summary,the increase in soil DOC under nitrogen input conditions was mainly related to the increase in plant-based carbon input,while the decrease in soil MBC was due to the inhibitory effect of nitrogen enrichment on microbial growth,which was related to a significant decrease in soil pH.And the different driving pathways of nitrogen input on soil DOC and MBC were the fundamental reasons for their differentiated responses.

关 键 词：氮输入 可溶性有机碳 微生物生物量碳 META分析 

分 类 号：S153.6[农业科学—土壤学]