兰州大学机构库 >草地农业科技学院
Microbial extracellular polysaccharide production and aggregate stability controlled by switchgrass (Panicum virgatum) root biomass and soil water potential
Sher, Yonatan1; Baker, Nameer R.2; Herman, Don2,3; Fossum, Christina2; Hale, Lauren4; Zhang, Xingxu5; Nuccio, Erin6; Saha, Malay7; Zhou, Jizhong3,8; Pett-Ridge, Jennifer6; Firestone, Mary2,3
2020
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY   Impact Factor & Quartile Of Published Year  The Latest Impact Factor & Quartile
ISSN0038-0717
Volume143
page numbers12
AbstractDeep-rooting perennial grasses are promising feedstocks for biofuel production, especially in marginal soils lacking organic material, nutrients, and/or that experience significant water stress. Perennial grass roots influence surrounding soil conditions and microbial activities, and produce extracellular polymeric substances (EPS) composed primarily of extracellular polysaccharides (EPSac). These polymers can alleviate microbial moisture and nutrient stress, and enhance soil characteristics through improved water retention and aggregate stability—which may in turn enhance carbon persistence. In this study we used a 13CO2 greenhouse tracer experiment to examine the effect of switchgrass cultivation on EPSac production and origin in a marginal soil with five fertilization/water treatments (control, +N, +NP, +P, low water), and compared these results with measurements of field soils collected after long-term switchgrass cultivation. Soils with added nitrogen and phosphorus (+NP) had the highest root biomass, EPSac and percentage of water-stable soil aggregates. Multiple linear regression analyses revealed that root biomass and soil water potential were important determinants of soil EPSac production, potentially by controlling carbon supply and diurnal changes in moisture stress. Path analysis showed that soil aggregation was positively correlated with bulk soil EPSac content and also regulated by soil water potential. High mannose content indicated the majority of EPSac was of microbial origin and 13CO2 labeling indicated that 0.18% of newly fixed plant carbon was incorporated into EPSac. Analysis of field soils suggests that EPSac is significantly enhanced after long-term switchgrass cultivation. Taken as a whole, our greenhouse and field results demonstrate that switchgrass cultivation can promote microbial production of EPSac, providing a mechanism to enhance aggregation in marginal soils.
© 2020 Elsevier Ltd
KeywordEPSac Marginal soil Stable soil aggregate Switchgrass Root biomass C-13 labeling
PublisherPERGAMON-ELSEVIER SCIENCE LTD
DOI10.1016/j.soilbio.2020.107742
Indexed BySCIE ; EI
Language英语
Funding ProjectNational Institute of Food and Agriculture[] ; University of Oklahoma[] ; [DE-SC0014079] ; University of California Berkeley[] ; Lawrence Livermore National Laboratory[SCW1555]
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000523634500009
PublisherElsevier Ltd
EI Accession Number20200808206845
EI KeywordsAgglomeration ; Aggregates ; Biomass ; Carbon ; Forestry ; Greenhouse effect ; Greenhouses ; Linear regression ; Nutrients ; Plants (botany) ; Polymers ; Soil moisture
EI Classification NumberHighway Engineering:406 ; Air Pollution:451 ; Soils and Soil Mechanics:483.1 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Polymeric Materials:815.1 ; Farm Buildings and Other Structures:821.6 ; Mathematical Statistics:922.2
Original Document TypeJournal article (JA)
Citation statistics
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/417177
Collection草地农业科技学院
Corresponding AuthorBaker, Nameer R.
Affiliation
1.Migal Galilee Research Institute, Kiryat Shmona, Israel
2.University of California, Berkeley; CA, United States
3.Lawrence Berkeley National Laboratory, Berkeley; CA, United States
4.USDA-Agricultural Research Service, Parlier; CA, United States
5.Lanzhou University, Lanzhou, China
6.Lawrence Livermore National Laboratory, Livermore; CA, United States
7.Noble Research Institute, Ardmore; OK, United States
8.University of Oklahoma, Norman; OK, United States
Recommended Citation
GB/T 7714
Sher, Yonatan,Baker, Nameer R.,Herman, Don,et al. Microbial extracellular polysaccharide production and aggregate stability controlled by switchgrass (Panicum virgatum) root biomass and soil water potential[J]. SOIL BIOLOGY & BIOCHEMISTRY,2020,143.
APA Sher, Yonatan.,Baker, Nameer R..,Herman, Don.,Fossum, Christina.,Hale, Lauren.,...&Firestone, Mary.(2020).Microbial extracellular polysaccharide production and aggregate stability controlled by switchgrass (Panicum virgatum) root biomass and soil water potential.SOIL BIOLOGY & BIOCHEMISTRY,143.
MLA Sher, Yonatan,et al."Microbial extracellular polysaccharide production and aggregate stability controlled by switchgrass (Panicum virgatum) root biomass and soil water potential".SOIL BIOLOGY & BIOCHEMISTRY 143(2020).
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