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首页> 外文期刊>Science of the total environment >Variations in soil organic carbon content with chronosequence, soil depth and aggregate size under shifting cultivation
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Variations in soil organic carbon content with chronosequence, soil depth and aggregate size under shifting cultivation

机译：耕作栽培中含有血管型，土壤深度和骨料大小的土壤有机碳含量的变化

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摘要

Shifting cultivation is a globally important form of agriculture covering over 280 million hectares in the tropics, but it has often been blamed for deforestation and forest degradation. In North East India (NEI) it has been practiced for millennia and it is an important element of the cultural identity of indigenous communities. It is often practiced on slopping lands with fragile soils (mostly Acrisols), which are prone to rapid degradation with cultivation. The shortened fallow cycle as practised currently is ecologically unsustainable and economically not viable. This study aimed to quantify (ⅰ) changes in soil bulk density, aggregate stability and compaction in relation to chronosequence and soil depth, (ⅱ) changes in the proportion of macro, meso, and micro aggregates and associated soil organic carbon (SOC) content in relation to soil depth and fallow chronosequence, and (ⅲ) determine the minimum fallow length that achieves SOC stocks comparable with adjacent intact forest land. The proportion of soil macro-aggregates and meso-aggregates significantly varied with land-use and soil depth as well as their interactive effects. Across all soil depths, forest land had the highest proportion of macro-aggregates (75.6%), while the currently cultivated land had the least proportion (51.1%). The SOC contents in macro-aggregates increased with fallow age and decreased with soil depth; the highest (1.95%) being in the top 10 cm soil of 20 years old fallows and the lowest (0.39%) in 21-30 cm depth of 5 years old fallows. Multivariate analysis identified bulk density and porosity as the most important variables to discriminate between land use practices. The analysis provided evidence for significant changes in soil compaction, aggregate stability and SOC content with the transition from undisturbed forest to slash-and-burn cultivation and fallow phases. It is concluded that a minimum of 20 years of fallow period is required to achieve SOC content and C stocks comparable with intact forest land.
机译：移位种植是一种全球重要的农业形式，在热带地区占地超过2.8亿公顷，但它经常被归咎于森林砍伐和森林退化。印度东北（内部）已经为千年实施而且是土着社区的文化认同的重要因素。它通常在倾斜的土地上练习脆弱的土壤（大多是acriasols），其易于培养快速降解。缩短的休耕周期，目前正在生态不可持续，经济上不可行。本研究旨在量化（Ⅰ）土壤堆积密度，聚集稳定性和对铬和土壤深度相关的压实的变化，（Ⅱ）宏观，中索和微聚集和相关土壤有机碳（SOC）含量的变化关于土壤深度和休耕时间，（Ⅲ）确定最小休耕长度，实现与相邻的完整林地相当的SoC股。土壤宏观聚集体和中学聚集体的比例显着变化了土地利用和土壤深度以及它们的互动效果。跨越所有土壤深度，林地的宏观聚集体比例最高（75.6％），而目前耕地的比例最少（51.1％）。宏观聚集体中的SOC内容随着休耕年龄的增加，并且土壤深度减少;最高（1.95％）位于20岁的10厘米的土壤中为20岁的休息和最低（0.39％）21-30厘米深度5岁的休息。多变量分析将堆积密度和孔隙度鉴定为最重要的变量，以区分土地利用实践。分析为土壤压实，综合稳定性和SoC含量的显着变化提供了证据，从未受到森林过渡到砍伐栽培和休耕阶段。得出结论，至少需要20年的休耕期，以实现与完整林地相当的SoC含量和C库存。

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  • 来源
    《Science of the total environment》 |2021年第25期|143114.1-143114.13|共13页
  • 作者

    Sabina Yasmin Laskar; Gudeta Weldesemayat Sileshi; Karabi Pathak; Nirmal Debnath; Arun Jyoti Nath; Kaynath Yasmin Laskar; Pator Singnar; Ashesh Kumar Das;

  • 作者单位

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India;

    Department of Plant Biology and Biodiversity Management Addis Ababa University Addis Ababa Ethiopia University of KwaZulu-Natal Private Bag X01 Pietermaritzburg 3209 South Africa;

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India Carbon Management and Sequestration Center The Ohio State University Columbus OH 43210 USA;

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India;

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India;

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India;

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India;

    Department of Ecology and Environmental Science Assam University Silchar 788011 Assam India;

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  • 正文语种 eng
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  • 关键词

    Acrisols; Aggregate stability; Fallow land; Forest degradation; Slash-and-bum;

    机译：acrisols;总稳定性;休耕地;森林退化;斜线和屁股;

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