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Dynamic microbial assembly processes correspond to soil fertility in sustainable paddy agroecosystems

Journal Article · · Functional Ecology
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [5]
  1. Institute of Soil Science, Chinese Academy of Sciences
  2. BATTELLE (PACIFIC NW LAB)
  3. Pennsylvania State University
  4. Chinese Academy of Sciences
  5. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science
1. Microorganisms underpin the sustainability of agroecosystems, but we have a poor understanding of how the assembly processes that govern microbial community structure interact through time to maintain soil fertility. 2. Ancient rice paddies have a history of cultivation spanning hundreds or thousands of years and provide an ideal opportunity to explore relationships between community assembly processes and long-term agroecosystem sustainability. We used statistical null models to evaluate temporal patterns of bacterial community assembly processes across rice cultivation years and their associations with increases in soil fertility in paddy agroecosystems. 3. We found that stochasticity was a persistent force structuring paddy soil microbial communities, putatively due to frequent flooding that facilities dispersal. However, determinism gradually increased over centuries of agriculture and corresponded to increases in soil fertility. Accordingly, multifunctionality, calculated using enzymes catalyzing key soil functions in carbon, nitrogen, phosphorous and sulfur cycling significantly increased along rice cultivation years. We therefore propose that balanced assembly processes preserve a diverse array of traits that can dominate under various circumstances (stochasticity) while allowing for traits relevant to soil fertility to be selected for by soil fertility (determinism), thus supporting multifunctionality that underlies sustainable agroecosystems. 4. In total, our results highlight that knowledge on temporal microbial assembly processes, community composition, and ecological function in context of soil fertility is key to understanding ecological mechanisms maintaining agroecosystems sustainability.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1719129
Report Number(s):
PNNL-SA-151048
Journal Information:
Functional Ecology, Journal Name: Functional Ecology Journal Issue: 6 Vol. 34
Country of Publication:
United States
Language:
English

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