Long-term fallowing produces specific fungal taxa associated with soil carbon storage

文献类型： 外文期刊

第一作者： Li, Fang

作者： Li, Fang;Li, Yue;Han, Yanlai;Wang, Yi;Li, Peipei;Chen, Lin;Zhang, Jiabao;Han, Yanlai;Zhang, Shuiqing

作者机构：

关键词： 13 C-labelling assay; Chaetomiaceae; CO2 fixation; long-term fertilization; microbial species resources; soil fungal community; soil organic C; Trichocladium

期刊名称：PEDOSPHERE （ 影响因子：7.3； 五年影响因子：6.2 ）

ISSN： 1002-0160

年卷期： 2024 年 34 卷 6 期

页码：

收录情况： SCI

摘要： 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 13 C-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.

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