Microbial metabolism strengths carbon sequestration and crop yield in upland red soil after long-term ex situ incorporation of straw

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Li Tang, Xiaobin Guo, Daoyou Huang, Xiaomeng Wei, Hao Sheng, Pei Luo, Ping Zhou, Wei Gao, Yan Li, Miaomiao Zhang, Wei Zheng, Jinshui Wu
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引用次数: 0

Abstract

Purpose

Incorporating rice straw into upland has been adopted as a strategy to increase crop productivity and decrease poisoning to rice from reducing substances accumulation as well as mitigate methane emission from paddy fields in South China. However, the mechanism underlying long-term ex situ incorporation of rice straw in upland on soil organic carbon (SOC) and crop yields through microbial metabolism remains unclear.

Materials and methods

Hence, a field experiment was established to investigate the response mechanism of SOC and crop yields underlying microbe-mediated carbon dynamics with nutrient stoichiometry by ex situ incorporation of rice straw in upland.

Results and discussion

The results showed that the treatment of cropping with chemical fertilizers plus rice straw (SCF) had the highest SOC accumulation rate (0.14 ± 0.03 g C kg−1 yr−1) during the 22-year experimental period. The mean yields of rapeseed and sweet potato were increased by 5.0% and 4.7% in the SCF treatment, correspondingly, compared with the treatment of cropping with chemical fertilizers (CF). Additionally, based on ecoenzymatic stoichiometry, soil microorganisms were found to be co-limited by carbon and phosphorus, which was aggravated by the decrease of soil available nutrients. The SCF treatment exhibited a higher soil microbiomass, resulting in an increased secretion of ecoenzymatic activities to mediate stoichiometric imbalance and mitigate nutrient competition between plant and microbial nutrient limitations. The findings revealed a significant association between stoichiometric imbalance and both SOC and crop yields, respectively.

Conclusions

Therefore, our study indicated that long-term ex situ incorporation of rice straw in upland could be adopted as an effective agricultural management strategy to improve SOC and crop yields.

Abstract Image

高地红壤中长期异地掺入秸秆后的微生物代谢优势固碳和作物产量
目的在华南地区,将水稻秸秆掺入高地是提高作物产量、减少还原性物质积累对水稻的毒害以及缓解稻田甲烷排放的一种策略。材料与方法建立了一个田间试验,研究在高地长期原位掺入水稻秸秆对土壤有机碳(SOC)和作物产量的影响机制。结果与讨论结果表明,在 22 年的实验期内,化肥加稻草(SCF)处理的 SOC 积累率最高(0.14 ± 0.03 g C kg-1 yr-1)。与施用化肥(CF)相比,SCF 处理的油菜籽和甘薯平均产量分别增加了 5.0% 和 4.7%。此外,根据生态酶化学计量学,发现土壤微生物受到碳和磷的共同限制,而土壤可用养分的减少又加剧了这种限制。SCF 处理的土壤微生物量较高,导致生态酶活性分泌增加,从而调解了化学计量失衡,缓解了植物和微生物养分限制之间的养分竞争。结论因此,我们的研究表明,在高地长期异地掺入水稻秸秆可作为一种有效的农业管理策略,以提高土壤有机碳含量和作物产量。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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