Microbial Community of Subsoiling Have a Stronger Ability to Utilize Carbon Sources Across Aggregate Classes in an Anniversary Rotation

IF 3.4 3区 农林科学 Q2 ENVIRONMENTAL SCIENCES
Ruxin Li, Xinkun Liu, Yi Lv, Qisong Gao, Yingxin Yu, Huifang Han
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Abstract

Purpose

The goal of global carbon (C) neutralization has raised concerns about the potential of soil organic carbon (SOC) storage, particularly regarding the role of soil microbial activities across aggregate classes. Reasonable tillage methods drive microbial community within soil aggregates, so have a stronger ability to utilize carbon sources. However, simultaneously studying the effects of tillage methods through microbial activity, functional and structural diversity at the aggregate level is relatively rare, and seasonal changes in the ability to utilize carbon sources of microbial communities remain largely unknown.

Methods

Initial from 2002, a 14-year long-term tillage experiment started; then in 2016–2017, we tested the following tillage methods: no tillage (NT), rotary tillage (RT), subsoiling (ST) and conventional tillage (CT).

Results

Compared with CT, ST had the most significant promoting effect on microbial activity across aggregate classes, and microbial activity (ATP and SIR) decreased with the aggregate classes decreasing. ATP and SIR increased by 3.23 µmol·g− 1 and 15.94 µg CO2·g− 1·d− 1 in winter wheat growth, and increased by 2.39 µmol·g− 1 and 31.16 µg CO2·g− 1·d− 1 in summer maize growth. Microbial communities in aggregates under ST and NT had greater diversity and ability to utilize carbon sources compared with CT, and those function showed the order of 5 − 2 > 2-0.25 > 0.25–0.053 mm. The microbial activity and diversity were higher in summer maize growth.

Conclusions

Therefore, ST is a promising tillage method for enhancing the soil microbial activity and diversity. Our study provides a fundamental understanding for the utilization of carbon sources by microbial community whithin aggregate level and highlights the importance of reasonable tillage methods.

Abstract Image

在周年轮作中,土壤下层微生物群落利用各种骨料类碳源的能力更强
目的 全球碳(C)中和的目标引起了人们对土壤有机碳(SOC)储存潜力的关注,尤其是对不同类别的土壤团聚体中土壤微生物活动的作用的关注。合理的耕作方法能推动土壤团聚体中微生物群落的发展,因此具有更强的利用碳源的能力。然而,通过微生物活动、功能和结构多样性同时研究耕作方法对团聚体的影响的研究相对较少,而且微生物群落利用碳源能力的季节性变化在很大程度上仍是未知的。方法最初从2002年开始,我们进行了为期14年的长期耕作试验;然后在2016-2017年,我们测试了以下耕作方法:免耕(NT)、旋耕(RT)、覆土(ST)和常规耕作(CT)。结果与CT相比,ST对各骨料等级的微生物活性具有最显著的促进作用,微生物活性(ATP和SIR)随着骨料等级的降低而降低。冬小麦生长过程中的 ATP 和 SIR 分别增加了 3.23 µmol-g- 1 和 15.94 µg CO2-g- 1-d-1,夏玉米生长过程中的 ATP 和 SIR 分别增加了 2.39 µmol-g- 1 和 31.16 µg CO2-g- 1-d-1。与 CT 相比,ST 和 NT 条件下聚集体中的微生物群落具有更高的多样性和利用碳源的能力,其功能呈现 5 - 2 > 2-0.25 > 0.25-0.053 mm 的顺序。因此,ST 是一种很有前景的提高土壤微生物活性和多样性的耕作方法。我们的研究从根本上了解了微生物群落在集聚水平上对碳源的利用,并强调了合理耕作方法的重要性。
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来源期刊
Journal of Soil Science and Plant Nutrition
Journal of Soil Science and Plant Nutrition Agricultural and Biological Sciences-Soil Science
CiteScore
5.90
自引率
10.30%
发文量
331
审稿时长
9 months
期刊介绍: The Journal of Soil Science and Plant Nutrition is an international, peer reviewed journal devoted to publishing original research findings in the areas of soil science, plant nutrition, agriculture and environmental science. Soil sciences submissions may cover physics, chemistry, biology, microbiology, mineralogy, ecology, pedology, soil classification and amelioration. Plant nutrition and agriculture submissions may include plant production, physiology and metabolism of plants, plant ecology, diversity and sustainability of agricultural systems, organic and inorganic fertilization in relation to their impact on yields, quality of plants and ecological systems, and agroecosystems studies. Submissions covering soil degradation, environmental pollution, nature conservation, and environmental protection are also welcome. The journal considers for publication original research articles, technical notes, short communication, and reviews (both voluntary and by invitation), and letters to the editor.
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