Pedosphere 34(6): 1014--1025, 2024
ISSN 1002-0160/CN 32-1315/P
©2024 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Long-term fallowing produces specific fungal taxa associated with soil carbon storage |
Fang LI1, Lin CHEN2, Yue LI1, Yanlai HAN1,3, Yi WANG1, Peipei LI1, Shuiqing ZHANG4, Jiabao ZHANG2 |
1 College of Resources and Environment, Henan Agricultural University, Zhengzhou 450044 (China)
2 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135 (China)
3 Co-Construction State Key Laboratory of Wheat and Maize Crop Science, College of Resources and Environment, Henan Agricultural University, Zhengzhou 450044 (China)
4 Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002 (China) |
| ABSTRACT |
| Cropland expansion has caused the loss of soil organic carbon (SOC) and the degradation of microbial communities. Fallowing is an important strategy for soil restoration, and fungi are critical in soil fertilization. This study compared the soil properties and fungal assemblage in two adjacent environments (farmland vs. fallowing) using a 30-year field experiment composed of five treatments: fallowing and agricultural management under no fertilization, chemical fertilization, and chemical fertilization plus cow manure or crop straw. The fallowed soil had more diverse fungi and maintained higher SOC than the artificially managed treatments. Importantly, the relative abundance of Chaetomiaceae was positively correlated with all the carbon components (SOC, dissolved organic carbon, and microbial biomass carbon) simultaneously. An RNA-Seq of Trichocladium uniseriatum, the key fungus affiliated with Chaetomiaceae, showed that straw addition significantly upregulated the genes for T. uniseriatum melanogenesis, resulting in recalcitrant necromass formation. A remarkable carbon dioxide (CO2) assimilation capacity of T. uniseriatum was revealed using 13C-labelling assay. Therefore, T. uniseriatum improved SOC storage directly by CO2 fixation and indirectly by melanogenesis. Fertilization of agricultural systems can stimulate the growth of T. uniseriatum. Inoculation of T. uniseriatum promoted crop growth, facilitating carbon absorption from the roots. This study highlights that the valuable microbial species resources preserved in fallowed soils can improve farmland ecosystems. |
| Key Words: 13C-labelling assay,Chaetomiaceae,CO2 fixation,long-term fertilization,microbial species resources,soil fungal community,soil organic C,Trichocladium |
| Citation: Li F, Chen L, Li Y, Han Y L, Wang Y, Li P P, Zhang S Q, Zhang J B. 2024. Long-term fallowing produces specific fungal taxa associated with soil carbon storage. Pedosphere. 34(6): 1014-1025. |
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