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Title: Farm management, not soil microbial diversity, controls nutrient loss from smallholder tropical agriculture

Journal Article · · Frontiers in Microbiology
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9]
  1. Columbia Univ., New York, NY (United States). Dept. of Ecology, Evolution and Environmental Biology; Columbia Univ., New York, NY (United States). The Earth Inst. Agriculture and Food Security Center
  2. Brown Univ., Providence, RI (United States). Dept. of Ecology and Evolutionary Biology
  3. Yale Univ., New Haven, CT (United States). School of Forestry and Environmental Studies
  4. Columbia Univ., New York, NY (United States). Dept. of Ecology, Evolution and Environmental Biology; Barnard College of Coumbia Univ., New York, NY (United States). Dept. of Biology
  5. Columbia Univ., New York, NY (United States). Dept. of Ecology, Evolution and Environmental Biology
  6. Brown Univ., Providence, RI (United States). Dept. of Ecology and Evolutionary Biology; Marine Biological Laboratory, Woods Hole, MA (United States). The Ecosystems Center
  7. Columbia Univ., New York, NY (United States). The Earth Inst. Agriculture and Food Security Center
  8. Columbia Univ., New York, NY (United States). The Earth Inst. Agriculture and Food Security Center; Univ. of Maryland, College Park, MD (United States). Dept. of Plant Science and Landscape Architecture
  9. Univ. of Oklahoma, Norman, OK (United States). Inst. for Environmental Genomics and Dept. of Microbiology and Plant Biology; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division; Tsinghua Univ., Beijing (China). School of Environment. Beijing Key State Joint Lab. of Environmental Simulation and Pollution Control

Tropical smallholder agriculture is undergoing rapid transformation in nutrient cycling pathways as international development efforts strongly promote greater use of mineral fertilizers to increase crop yields. These changes in nutrient availability may alter the composition of microbial communities with consequences for rates of biogeochemical processes that control nutrient losses to the environment. Ecological theory suggests that altered microbial diversity will strongly influence processes performed by relatively few microbial taxa, such as denitrification and hence nitrogen losses as nitrous oxide, a powerful greenhouse gas. Whether this theory helps predict nutrient losses from agriculture depends on the relative effects of microbial community change and increased nutrient availability on ecosystem processes. We find that mineral and organic nutrient addition to smallholder farms in Kenya alters the taxonomic and functional diversity of soil microbes. However, we find that the direct effects of farm management on both denitrification and carbon mineralization are greater than indirect effects through changes in the taxonomic and functional diversity of microbial communities. Changes in functional diversity are strongly coupled to changes in specific functional genes involved in denitrification, suggesting that it is the expression, rather than abundance, of key functional genes that can serve as an indicator of ecosystem process rates. Our results thus suggest that widely used broad summary statistics of microbial diversity based on DNA may be inappropriate for linking microbial communities to ecosystem processes in certain applied settings. Our results also raise doubts about the relative control of microbial composition compared to direct effects of management on nutrient losses in applied settings such as tropical agriculture.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1628131
Journal Information:
Frontiers in Microbiology, Vol. 6; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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Tree Plantation Systems Influence Nitrogen Retention and the Abundance of Nitrogen Functional Genes in the Solomon Islands journal December 2015
Plant growth and oil contamination alter the diversity and composition of bacterial communities in agricultural soils across China journal May 2018
Seasonal Changes in a Maize-Based Polyculture of Central Mexico Reshape the Co-occurrence Networks of Soil Bacterial Communities journal December 2017
Agricultural intensification and the functional capacity of soil microbes on smallholder African farms journal March 2015
Tree Plantation Systems Influence Nitrogen Retention and the Abundance of Nitrogen Functional Genes in the Solomon Islands journal December 2015
Agroforestry coffee soils increase the insect‐suppressive potential offered by entomopathogenic fungi over full‐sun soils: A case proposing a “bait survival technique” journal August 2019
Agroforestry coffee soils increase the insect‐suppressive potential offered by entomopathogenic fungi over full‐sun soils: A case proposing a “bait survival technique” journal August 2019
Impact of Cropping Systems, Soil Inoculum, and Plant Species Identity on Soil Bacterial Community Structure journal September 2016

Figures / Tables (6)