Adoption of no-tillage alters the pools of SOM with various thermal stability and their chemical composition by changing their sources in Northeast China

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
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Abstract

The stability and chemical composition of SOM are related to the changes of the proportions of old and young SOM. However, there are few studies that investigated the effects of no-tillage (NT) on the stability, chemical composition, and sources of SOM. In this study, the effects of 9-years of NT on the contents of total, thermally labile and stable SOM, their chemical composition and the contributions from C3 and C4 plants were determined. Before application of NT, the field has been used for C4 maize cultivation under conventional tillage (CT) management about 80 years after initial C3 grassland reclamation. Soil samples were collected in the 0–20 cm soil profile. Under NT treatment, the contents of total SOC, thermally labile and stable SOC, and C4-SOC decreased with soil depths. However, they were greater in the 0–10 cm layers than that in the 10–20 cm layer under CT. The contents of C3-SOC showed no change with depths under both of tillage treatments. NT had greater contents of total SOC, C4-SOC, thermal-labile SOC, and C4-SOCthermal-labile than CT in the 0–5 cm layer, but lower in the subsoil layers. The contents of C3-SOCthermal-labile decreased in the 0–5 cm layer under NT. The alkyl-C and O-alkyl-C were the main fractions of thermal-labile SOM and aromatic-C was the dominant fraction of thermal-stable SOM. C4-SOC (young SOC) was significantly positively correlated with alkyl-C and O-alkyl-C and negatively correlated with aromatic-C. Our results indicated that: (1) compared with continuously CT, applying NT resulted in SOC accumulation in the surface layer, (2) more maize residue input increased the new thermally labile and stable SOM yet lead to decrease the C3-SOCthermal-labile under NT, (3) the contributions of C3 and C4-direved SOM determined the chemical compositions of various SOM pools.

免耕改变了中国东北地区不同热稳定性的 SOM 库及其化学成分来源
SOM 的稳定性和化学成分与新老 SOM 比例的变化有关。然而,很少有研究调查免耕(NT)对 SOM 的稳定性、化学成分和来源的影响。本研究测定了 9 年免耕对总 SOM、热易变 SOM 和稳定 SOM 的含量、化学成分以及 C 和 C 植物贡献的影响。在施用氮磷钾之前,这片草地在最初的 C 类草地开垦后约 80 年,一直在常规耕作(CT)管理下种植 C 类玉米。土壤样本采集于 0-20 厘米的土壤剖面。在 NT 处理下,总 SOC、热易变和稳定 SOC 以及 C-SOC 的含量随土壤深度的增加而减少。但是,在 CT 条件下,0-10 厘米土层中的 SOC 含量高于 10-20 厘米土层中的 SOC 含量。在两种耕作处理下,C-SOC 的含量没有随深度变化而变化。与 CT 相比,NT 在 0-5 厘米土层中的总 SOC、C-SOC、热稳定 SOC 和 C-SOC 含量更高,但在底土层中含量较低。在 NT 条件下,0-5 厘米土层中的 C-SOC 含量下降。烷基-C和O-烷基-C是热敏性SOM的主要组分,芳香族-C是热稳定性SOM的主要组分。C-SOC(年轻 SOC)与烷基-C 和邻烷基-C 呈显著正相关,而与芳香族-C 呈显著负相关。我们的研究结果表明(1) 与持续的 CT 相比,施用 NT 会导致 SOC 在表层积累;(2) 更多的玉米秸秆投入会增加新的热敏性和稳定性 SOM,但会导致 NT 条件下 C-SOC 的减少;(3) C 和 C-direved SOM 的贡献决定了各种 SOM 池的化学组成。
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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