The microbial community,nutrient supply and crop yields differ along a potassium fertilizer gradient under wheat-maize double-cropping systems  

作　　者：Zeli Li Fuli Fang Liang Wu Feng Gao Mingyang Li Benhang Li Kaidi Wu Xiaomin Hu Shuo Wang Zhanbo Wei Qi Chen Min Zhang Zhiguang Liu 

机构地区：[1]Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection,College of Resources andEnvironment,Linyi University,Linyi 276000,China [2]National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources,College of Resources and theEnvironment,Shandong Agricultural University,Tai’an 271018,China [3]Key Laboratory of Crop Specific Fertilizer,Ministry of Agriculture and Rural Affairs/Xinyangfeng Agricultural Technology Co.,Ltd.,Jingmen 448001,China [4]Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110000,China

出　　处：《Journal of Integrative Agriculture》2024年第10期3592-3609,共18页农业科学学报（英文版）

基　　金：funded by the National Key Research and Development Program of China(2023YFD150050504);the Key Research and Development Program of Shandong Province,China(2022SFGC0301);the Strategic Priority Research Program of the Chinese Academy of Sciences-Development and Application Technology of Special Package Fertilizer for Improving Albic Soil(XDA28100203)。

摘　　要：Soil microorganisms play critical roles in ecosystem function.However,the relative impact of the potassium(K)fertilizer gradient on the microbial community in wheat-maize double-cropping systems remains unclear.In this long-term field experiment(2008-2019),we researched bacterial and fungal diversity,composition,and community assemblage in the soil along a K fertilizer gradient in the wheat season(K0,no K fertilizer;K1,45 kg ha^(-1) K_(2)O;K_(2),90 kg ha^(-1)K_(2)O;K3,135 kg ha^(-1)K_(2)O)and in the maize season(K0,no K fertilizer;K_(1),150 kg ha^(-1) K_(2)O;K_(2),300 kg ha^(-1)K_(2)O;K_(3),450 kg ha^(-1)K_(2)O)using bacterial 16S rRNA and fungal internally transcribed spacer(ITS)data.We observed that environmental variables,such as mean annual soil temperature(MAT)and precipitation,available K,ammonium,nitrate,and organic matter,impacted the soil bacterial and fungal communities,and their impacts varied with fertilizer treatments and crop species.Furthermore,the relative abundance of bacteria involved in soil nutrient transformation(phylum Actinobacteria and class Alphaproteobacteria)in the wheat season was significantly increased compared to the maize season,and the optimal K fertilizer dosage(K2 treatment)boosted the relative bacterial abundance of soil nutrient transformation(genus Lactobacillus)and soil denitrification(phylum Proteobacteria)bacteria in the wheat season.The abundance of the soil bacterial community promoting root growth and nutrient absorption(genus Herbaspirillum)in the maize season was improved compared to the wheat season,and the K2 treatment enhanced the bacterial abundance of soil nutrient transformation(genus MND1)and soil nitrogen cycling(genus Nitrospira)genera in the maize season.The results indicated that the bacterial and fungal communities in the double-cropping system exhibited variable sensitivities and assembly mechanisms along a K fertilizer gradient,and microhabitats explained the largest amount of the variation in crop yields,and improved wheat?maize yields by 11.2-22.6 and

关 键 词：potassium fertilizer gradient microbial community wheat-maize double cropping climate change yield 

分 类 号：S154.3[农业科学—土壤学]