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<p>Monoculture <i>Hevea brasiliensis</i> plantations often exhibit reduced soil nitrogen (N) and soil organic carbon (SOC) levels due to insufficient vegetation cover. To improve management, we evaluated the effects of intercropping with the legume <i>Centrosema pubescens</i> (<i>C. pubescens</i>) and retaining natural weeds on soil N and SOC variation in inter-rows (between tree rows) and intra-rows (within tree rows). We measured SOC, total N, available N, ammonium N (NH₄⁺-N), and nitrate N (NO₃⁻-N) monthly (July-December 2018) at 0–60&#xa0;cm depth in a 14-year-old plantation during three years. We used four treatments: <i>C. pubescens</i> in inter-rows (Inter-CP), no legume in intra-rows (Intra-CP), weeds in inter-rows (Inter-W), and no weeds in intra-rows (Intra-W). All parameters varied significantly with depth and time. The average concentrations of SOC, total N, available N, NH₄⁺-N, and NO₃⁻-N in the 0–60&#xa0;cm profile were significantly higher under Inter-CP than under Inter-W. Available N and NO₃⁻-N accumulated in greater amounts in inter-rows than in intra-rows. Total N and available N levels were linked to seasonally fluctuating total N reserves. <i>Centrosema pubescens</i> and natural weeds increased inorganic N availability in their respective inter-row settings; however, the legume provided a greater supply. Therefore, planting <i>C. pubescens</i> and/or maintaining weed cover in inter-rows is recommended to enhance soil N and C accumulation and improve long-term plantation productivity.</p>

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Effects of Centrosema pubescens intercropping and naturally growing weeds on soil nitrogen and organic carbon in a Hevea brasiliensis plantation

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Yongchuan Chen,
  • Qiao Chen,
  • Yueye Deng,
  • Degang Zhang,
  • Xinhua He

摘要

Monoculture Hevea brasiliensis plantations often exhibit reduced soil nitrogen (N) and soil organic carbon (SOC) levels due to insufficient vegetation cover. To improve management, we evaluated the effects of intercropping with the legume Centrosema pubescens (C. pubescens) and retaining natural weeds on soil N and SOC variation in inter-rows (between tree rows) and intra-rows (within tree rows). We measured SOC, total N, available N, ammonium N (NH₄⁺-N), and nitrate N (NO₃⁻-N) monthly (July-December 2018) at 0–60 cm depth in a 14-year-old plantation during three years. We used four treatments: C. pubescens in inter-rows (Inter-CP), no legume in intra-rows (Intra-CP), weeds in inter-rows (Inter-W), and no weeds in intra-rows (Intra-W). All parameters varied significantly with depth and time. The average concentrations of SOC, total N, available N, NH₄⁺-N, and NO₃⁻-N in the 0–60 cm profile were significantly higher under Inter-CP than under Inter-W. Available N and NO₃⁻-N accumulated in greater amounts in inter-rows than in intra-rows. Total N and available N levels were linked to seasonally fluctuating total N reserves. Centrosema pubescens and natural weeds increased inorganic N availability in their respective inter-row settings; however, the legume provided a greater supply. Therefore, planting C. pubescens and/or maintaining weed cover in inter-rows is recommended to enhance soil N and C accumulation and improve long-term plantation productivity.