Effect of peanut straw mulching on the soil nitrogen change and functional genes in the Camellia oleifera intercropping system

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Wei Zheng, Lei Hu, Yuanying Peng, Jinshui Wu, Wende Yan
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引用次数: 0

Abstract

Purpose

This study aims to evaluate the impact of peanut straw mulching on the N change and the functional genes in Camellia oleifera intercropping systems.

Methods

A field experiment with different types of straw mulch treatments (conventional tillage, whole, and crushed) and timing was (50 d and 150 d) established between 2018–2022; the soil N fractions, N transformation rates, the abundance and dominant species compositions of ammonia-oxidizing archaea (AOA), nirK, and nirS-harboring genes were investigated.

Results

The whole peanut straw mulching of 150 d significantly improved (P < 0.05) the content of soil microbial biomass N (MBN), ammonia N (NH4+), and nitrate N (NO3-). The soil nitrification and ammonification rates increased by 96.8% and 132% in the 150 d of peanut crushed and whole straw mulching, respectively. Notably, the peanut straw mulching of 50 d mainly affects the diversity and relative abundance of AOA while the soil nirK and nirS-harboring genes were affected by 150 d crushed and whole peanut straw mulching, respectively. Redundancy analysis showed that crushed and whole peanut straw mulching affects nitrate reductase as the primary factor in regulating the soil N cycle via functional genes and soil variables.

Conclusions

Long-term whole peanut straw or whole and crushed mixed straw mulching could hence be recommended to dryland farming communities to increase the soil N cycle and crop productivity in the C.oleifera-peanut intercropping system.

Abstract Image

花生秸秆覆盖对山茶油间作系统土壤氮素变化和功能基因的影响
目的 本研究旨在评估花生秸秆覆盖对油茶间作系统中氮素变化和功能基因的影响。方法 在2018-2022年期间,建立了不同类型秸秆覆盖处理(常规耕作、全秸秆覆盖和粉碎秸秆覆盖)和时间(50 d和150 d)的田间试验;研究了土壤氮组分、氮转化率、氨氧化古菌(AOA)、nirK和nirS-有害基因的丰度和优势物种组成。结果 整株花生秸秆覆盖 150 d 后,土壤微生物生物量氮(MBN)、氨氮(NH4+)和硝酸根氮(NO3-)含量显著提高(P < 0.05)。在花生秸秆粉碎覆盖和全秸秆覆盖的 150 d 内,土壤硝化率和氨化率分别提高了 96.8% 和 132%。值得注意的是,50 d 的花生秸秆覆盖主要影响 AOA 的多样性和相对丰度,而 150 d 的花生秸秆粉碎覆盖和全秸秆覆盖则分别影响土壤中的 nirK 和 nirS 负载基因。冗余分析表明,粉碎的花生秸秆和整根花生秸秆覆盖影响硝酸还原酶,这是通过功能基因和土壤变量调节土壤氮循环的主要因素。
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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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