[Changes in Physical Fractions within Soil Aggregates Under Nitrogen Reduction and Film Mulching Measures in Dryland Wheat Field].

Q2 Environmental Science Huanjing Kexue/Environmental Science Pub Date : 2024-10-08 DOI:10.13227/j.hjkx.202311136
Jun-Yu Xie, Yu-Yan Bai, Han-Bing Cao, Feng-Mao Zhang, Xin-Ge Shi, Yi-Fan Liu, Ting-Liang Li
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Abstract

We studied the changes in various physical fractions within aggregates in the arid plateau of southern Shanxi Province, which has great significance for synergistically improving soil fertility and crop productivity in this region. Bulk soil samples were collected from 0-20 cm layers during a 7-year long-term experiment in Hongtong County, Shanxi Province. Wheat grain yields, SOC concentrations, proportions, and OC contents within soil aggregates were analyzed. OC contents included: unprotected coarse particulate organic carbon within macroaggregate (M-cPOC) and fine particulate organic carbon within macroaggregate (M-fPOC), physically protected intra-aggregate particulate organic carbon within macroaggregate (M-iPOC), chemically/biochemically protected mineral organic carbon within macroaggregate (M-MOC), unprotected fine particulate organic carbon within microaggregate (m-fPOC), physically protected intra-aggregate particulate organic carbon within microaggregate (m-iPOC), and chemically/biochemically protected mineral organic carbon within microaggregate (m-MOC). The treatments were ① farmer fertilization (FP), ② nitrogen reduction monitoring and control fertilization (MF), ③ nitrogen reduction monitoring and control fertilization plus ridge film and furrow sowing (RF), and ④ nitrogen reduction monitoring and control fertilization plus flat film hole sowing (RF). The results showed that compared with that in the FP treatment, MF reduced SOC concentration while maintaining wheat grain yield, RF and FH synergistically improved soil fertility and crop yield, especially for the FH with SOC concentration, and wheat grain yield increased by 8.44% and 48.86%, respectively. MF significantly reduced the content of M-cPOC, RF significantly increased the content of M-iPOC, and FH significantly increased the contents of M-fPOC, M-iPOC, M-MOC, and m-iPOC by 64.00%, 98.39%, 6.16%, and 17.48%, respectively. In addition, combined with redundancy analysis, we found that the M-iPOC fraction played a major role in increasing SOC concentration and wheat grain yield, with a contribution rate of 61.5%. Therefore, the contribution of macroaggregates to soil fertility and crop productivity was higher than that of microaggregates in the arid plateau area of southern Shanxi, and flat film hole sowing could increase the content of M-iPOC, thereby synergistically increasing SOC sequestration and wheat grain yield, which could promote this cultivation technology in the region and even in the country's arid agricultural areas.

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[旱地麦田减氮和薄膜覆盖措施下土壤团聚体内部物理组分的变化]。
我们研究了山西省南部干旱高原地区团聚体内部各种物理组分的变化,这对协同提高该地区的土壤肥力和作物产量具有重要意义。在山西省洪洞县进行的一项为期 7 年的长期试验中,采集了 0-20 厘米土层的大量土壤样本。分析了土壤团聚体中小麦籽粒产量、SOC 浓度、比例和 OC 含量。有机碳含量包括:大团聚体(M-cPOC)中未受保护的粗颗粒有机碳和大团聚体(M-cPOC)中的细颗粒有机碳。和大团聚体(M-fPOC)中的细颗粒有机碳、大团聚体(M-iPOC)中受物理保护的团聚体内部颗粒有机碳、大团聚体(M-MOC)中受化学/生物化学保护的矿物有机碳、微团聚体(m-fPOC)中未受保护的细颗粒有机碳、微团聚体(m-iPOC)中受物理保护的团聚体内部颗粒有机碳以及微团聚体(m-MOC)中受化学/生化保护的矿物有机碳。处理为①农户施肥(FP)、②减氮监测和对照施肥(MF)、减氮监控施肥加脊膜沟播(RF)和④减氮监控施肥加平膜穴播(RF)。结果表明,与 FP 处理相比,MF 在保持小麦籽粒产量的同时降低了 SOC 浓度,RF 和 FH 协同提高了土壤肥力和作物产量,尤其是 FH 提高了 SOC 浓度,小麦籽粒产量分别增加了 8.44% 和 48.86%。MF 明显降低了 M-cPOC 的含量,RF 明显提高了 M-iPOC 的含量,而 FH 则明显提高了 M-fPOC、M-iPOC、M-MOC 和 m-iPOC 的含量,增幅分别为 64.00%、98.39%、6.16% 和 17.48%。此外,结合冗余分析,我们发现 M-iPOC 部分在提高 SOC 浓度和小麦产量方面发挥了重要作用,贡献率达 61.5%。因此,在陕南干旱高原地区,宏观团粒结构对土壤肥力和作物产量的贡献率高于微观团粒结构,平膜穴播可以增加 M-iPOC 的含量,从而协同提高 SOC 固碳量和小麦籽粒产量,可在该地区乃至全国干旱农业区推广该栽培技术。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
期刊最新文献
[Advances in the Separation and Removal of Microplastics in Water Treatment Processes]. [Analysis of Ozone Pollution and Precursor Control Strategies in the Pearl River Delta During Summer and Autumn Transition Season]. [Changes in Physical Fractions within Soil Aggregates Under Nitrogen Reduction and Film Mulching Measures in Dryland Wheat Field]. [Changes in Phytoplankton Community Structure in Qingcaosha Reservoir Based on Time Series Analysis]. [Characteristics and Drivers of Soil Carbon, Nitrogen, and Phosphorus Ecological Stoichiometry at the Heavy Degradation Stage of the Alpine Meadow].
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