1. Micobial community (diversity and functional traits) underpin the sustainability of 11 agroecosystems. Assembly processes influence microbial community composition 12 and in turn determine their functional traits. However we have a poor 13 understanding of how assembly processes that govern microbial community 14 interact through time to maintain soil fertility. 15 2. Flooded rice fields are one kind of agroecosystems with high level of 16 sustainability. Ancient rice paddies have a history of cultivation spanning 17 hundreds or thousands of years and thus provide an ideal opportunity to explore 18 relationships between community assembly processes and agroecosystem 19 sustainability. In this study, we used statistical null models to evaluate temporal 20 patterns of bacterial community assembly processes along rice cultivation years 21 and their associations with increases in soil fertility in paddy agroecosystems. 22 3. We found that stochasticity was a persistent force structuring paddy soil microbial 23 communities, putatively due to frequent flooding that facilities dispersal. However, 24 determinism gradually increased over centuries of agriculture and corresponded to 25 increases in soil fertility. Accordingly, multifunctionality, calculated using 26 enzymes catalyzing key soil functions in carbon, nitrogen, phosphorous and sulfur 27 cycling significantly increased along rice cultivation years. We therefore propose 28 that balanced assembly processes preserve a diverse array of traits that can dominate under various circumstanceswhile allowing for traits relevant to soil fertility to be selected for by soil fertility, thus supporting multifunctionality that underpins agroecosystem sustainability. 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 agroecosystem sustainability.
Dynamic microbial assembly processes correspond to soil fertility in sustainable paddy agroecosystems
Wenjing Liu,E. Graham,L. Zhong,Jianwei Zhang,Weitao Li,Zhongpei Li,Xiangui Lin,Youzhi Feng
Published 2020 in Functional Ecology
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- Publication year
2020
- Venue
Functional Ecology
- Publication date
2020-03-24
- Fields of study
Agricultural and Food Sciences, Biology, Environmental Science
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Semantic Scholar
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