Soil bacterial community response to rhizoma peanut incorporation into Florida pastures

被引:8
|
作者
Guerra, Victor A. [1 ]
Beule, Lukas [2 ]
Mackowiak, Cheryl L. [1 ]
Dubeux, Jose C. B. [3 ]
Blount, Ann R. S. [1 ]
Wang, Xiao-Bo [4 ,5 ]
Rowland, Diane L. [6 ,7 ]
Liao, Hui-Ling [1 ]
机构
[1] Univ Florida, North Florida Res & Educ Ctr, 155 Res Rd, Quincy, FL 32351 USA
[2] Julius Kuhn Inst JKI, Fed Res Ctr Cultivated Plants, Inst Ecol Chem Plant Anal & Stored Prod Protect, Konigin Luise Str 19, D-14195 Berlin, Germany
[3] Univ Florida, North Florida Res & Educ Ctr, 3925 Highway 71, Marianna, FL 32446 USA
[4] Lanzhou Univ, State Key Lab Grassland Agroecosyst, Ctr Grassland Microbiome, Lanzhou 730020, Peoples R China
[5] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730020, Peoples R China
[6] Univ Florida, Agron Dept, Gainesville, FL 32611 USA
[7] Univ Maine, Coll Nat Sci Forestry & Agr, Orono, ME 04469 USA
基金
美国食品与农业研究所;
关键词
MICROBIAL COMMUNITIES; PLANT DIVERSITY; NITROGEN; BAHIAGRASS; FERTILIZATION; PRODUCTIVITY; GRASSLANDS;
D O I
10.1002/jeq2.20307
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Incorporating legumes is one option for improving pasture fertility, sustainability, and biodiversity. Diazotrophic microorganisms, including rhizobia that form symbioses with legumes, represent a small fraction of the total soil microbial community. Yet, they can offset nitrogen (N) fertilizer inputs through their ability to convert atmospheric N-2 into plant-usable N via biological N-2 fixation (BNF). This study used amplicon sequencing of 16S rRNA genes to investigate soil bacterial community composition and diversity in grazed 'Argentine' bahiagrass (Paspalum notatum Flugge) pastures where N fertilizer was supplanted with legume-derived N from BNF in some treatments. Treatments consisted of bahiagrass fertilized with (a) mineral N (224 kg N ha(-1) yr(-1)), (b) combination mineral N (34 kg N ha(-1) yr(-1)) and legume-derived N via cool-season clover (CSC) (Trifolium spp.) mix, or (c) combination mineral N (34 kg N ha(-1) yr(-1)) and legume-derived N via CSC mix and strips of Ecoturf rhizoma peanut (Arachis glabrata Benth.). Bradyrhizobium spp. relative abundance was 44% greater in the mixed pasture. Other bacterial genera with BNF or denitrification potentials were greater in pastures with legumes, whereas sequences assigned to genera associated with high litter turnover were greater in bahiagrass pastures receiving only mineral N. Soil bacteria alpha diversity was greater in pastures receiving 34 kg ha(-1) yr(-1) N fertilizer application and the CSC mix than in pastures with the CSC mix and rhizoma peanut strips. Our results demonstrate soil microbial community shifts that may affect soil C and N cycling in pastures common to the southeastern United States.
引用
收藏
页码:55 / 65
页数:11
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