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首页> 外文期刊>Land Degradation and Development >Temporal heterogeneity has no effect on the direction of succession in abandoned croplands in a semiarid area of northwest China
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Temporal heterogeneity has no effect on the direction of succession in abandoned croplands in a semiarid area of northwest China

机译：颞异质性对中国西北地区的半干旱地区的废弃农田的连续方向没有影响

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摘要

Space for time substitution has been widely used in the study of succession in abandoned croplands worldwide but it is often accompanied by time heterogeneity. However, the effect of temporal heterogeneity on succession dynamics over decades is not well understood. Here, we studied croplands with the same history that were abandoned in 1998, 1999, and 2000 in northwest China (temporal heterogeneity) and continuously monitored for vegetation characteristics for 10 years. Aboveground biomass, taxonomic, and functional diversity were compared in the three cropland groups over time. Our results showed that the direction of succession in the three cropland groups was similar, from a community with single dominant species with higher aboveground biomass to a community with multiple dominant species with lower aboveground biomass. Taxonomic and functional diversity increased rapidly in the first 5-6 years, followed by slow increase, decrease, or stabilization. In years 1-5, aboveground biomass, taxonomic, and functional diversity were affected by rainfall, time of abandonment, time since abandonment, or their interactions. However, in years 6-10, biomass was only affected by rainfall, and functional evenness was affected by rainfall and time since abandonment; there was no time of abandonment effect. We conclude that temporal heterogeneity can initially affect the succession process but has no effect on the direction of community succession in the longer term. Our findings provide evidence for using space for time substitution with temporal heterogeneity to study succession in abandoned croplands in semiarid areas.
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  • 来源
    《Land Degradation and Development》 |2021年第1期|共10页
  • 作者

    Hu An; Chang Sheng-Hua; Chen Xian-Jiang; Hou Fu-Jiang; Nan Zhi-Biao;

  • 作者单位

    Lanzhou Univ Coll Pastoral Agr Sci &

    Technol State Key Lab Grassland Agroecosyst Key Lab Grassland Livestock Ind Innovat Minist Ag Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Coll Pastoral Agr Sci &

    Technol State Key Lab Grassland Agroecosyst Key Lab Grassland Livestock Ind Innovat Minist Ag Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Coll Pastoral Agr Sci &

    Technol State Key Lab Grassland Agroecosyst Key Lab Grassland Livestock Ind Innovat Minist Ag Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Coll Pastoral Agr Sci &

    Technol State Key Lab Grassland Agroecosyst Key Lab Grassland Livestock Ind Innovat Minist Ag Lanzhou 730000 Gansu Peoples R China;

    Lanzhou Univ Coll Pastoral Agr Sci &

    Technol State Key Lab Grassland Agroecosyst Key Lab Grassland Livestock Ind Innovat Minist Ag Lanzhou 730000 Gansu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;
  • 关键词

    abandoned cropland; aboveground biomass; functional diversity; taxonomic diversity; temporal heterogeneity;

    机译：被遗弃的耕地;上面的生物量;功能多样性;分类学多样性;时间异质性;

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