Legacy effect of long-term rice-crab co-culture on N2O emissions in paddy soils

文献类型： 外文期刊

第一作者： Li, Weijing

作者： Li, Weijing;Zhang, Yibin;Wang, Hongyuan;Fan, Bingqian;Bashir, Muhammad Amjad;Liu, Hongbin;Li, Weijing;Jin, Ke

作者机构：

关键词： Rice; Rice-crab co-culture; Soil fertility; Microbial community; N2O

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.8； 五年影响因子：5.1 ）

ISSN： 0929-1393

年卷期： 2024 年 196 卷

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收录情况： SCI

摘要： Recent evidence suggests that rice-crab (RC) co-culture impacts N2O emissions; however, the underlying mechanisms of this remain unclear. To identify N2O emission characteristics and reveal the mechanisms involved in paddy soils under the regimes of rice monoculture (RM) and RC co-culture with different levels of soil fertility, a 30-day flooded incubation experiment was conducted using four long-term (> 12 years) paddy soils: a) RM with low-fertility (RM-L); b) RM with high-fertility (RM-H); c) RC with low-fertility (RC-L); and d) RC with highfertility (RC-H). The results showed that cumulative N2O emissions from RM-H soil were 952 mu g kg( -1), 2.1 times that of RM-L soil. The cumulative N2O emissions from RC-L soil and RC-H soil were 751 and 742 mu g kg( -1), respectively. Pearson correlation analysis showed that cumulative N2O emissions showed a strong positive relationship with the community composition of denitrifiers (nirK, nirS, and nosZ). In terms of soil properties, the changes in the soil pH, NH4+-N, NO3--N, dissolved organic nitrogen, soil organic carbon, and dissolved organic carbon (43 %-99 %) in the RM system were greater than in the co-culture system (3 %-35 %), irrespective of soil fertility. The greater abundance of Azospirillum in the high-fertility soils under co-culture was an important reason for the lower N2O emissions. In addition, genera with higher relative abundances associated with N2O emissions were not present in RC-L soil, while in RM systems, the microbial community structure of low- and high-fertility soil differed significantly. These findings suggested that RC co-culture systems could mitigate enhanced N2O emissions resulting from higher soil fertility, which was ascribed primarily to the more stable soil properties and microbial community structure of the RC system in high-fertility soil.

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