Organic-inorganic fertilization promotes paddy soil macroaggregate organic carbon accumulation associated with key bacterial populations in subtropical China

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外文摘要：Macroaggregate organic carbon(Macro-OC)accumulation in paddy soils is of great significance in promoting multiple agroecosystem services.However,the effects of different fertilization practices on Macro-OC accumulation in paddy soils at the regional scale have not been comprehensively investigated.Here,we conducted long-term fertilization field experiments at four sites,Taoyuan,Wangcheng,Jinxian,and Suzhou,in the subtropical area of China to reveal the effects of inorganic and organic-inorganic(OIF)fertilization on Macro-OC accumulation and its relationships with important microbial traits(the abundance ratio of GH48:cbhl genes and the richness of keystone bacterial taxa)in paddy soils.The results showed that long-term fertilization(particularly OIF)significantly increased the content of Macro-OC,which mainly consisted of particulate organic carbon(C).Organic-inorganic fertilization decreased the percentage of O-alkyl C but increased the percentages of alkyl,aromatic,and phenolic C.Organic-inorganic fertilization promoted the abundance of the bacterial cellulose-degrading gene GH48 retrieved from macroaggregates.The orders Anaerolineales,Bacillales,and Clostridiales were identified as keystone bacterial taxa in macroaggregates and were significantly correlated with the physical fraction and chemical structure of Macro-OC.Structural equation modeling revealed that fertilization-induced changes in soil pH and C:N ratio affected the richness of Anaerolineales,Bacillales,and Clostridiales,which was strongly associated with the increase of percentages of aromatic and phenolic C and further facilitated Macro-OC accumulation.Together,these results suggested that OIF promoted Macro-OC accumulation associated with key bacterial populations in paddy soils.The results provide an important basis for boosting soil C accrual in the subtropical rice-growing areas.

外文关键词：

bacterial communitykeystone bacterial taxamean weight diametermineral-associated organic carbonparticulate organic carbonstructural equation modeling

作者：

Jinhua ZHAO、Lin CHEN、Guixiang ZHOU、Fang LI、Jiabao ZHANG、Congzhi ZHANG、Donghao MA、Biao FENG

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作者单位：

Fengqiu Experimental Station of National Ecosystem Research Network of China,State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008(China)

University of Chinese Academy of Sciences,Beijing 100049(China)

College of Resources and Environment,Henan Agricultural University,Zhengzhou 450002(China)

基金：

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of Chinese Academy of SciencesStrategic Priority Research Program of Chinese Academy of SciencesChina Agriculture Research SystemChina Agriculture Research System

项目编号：

2022YFD15004012022YF-D15002034217733241967002XDA24020104XDA28020203CARS-03-15CARS-52

出版年：

2024

DOI：

10.1016/j.pedsph.2023.07.004

土壤圈(英文版)

中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD

影响因子：0.477

ISSN：1002-0160

年,卷(期)：2024.34(5)