Scholarlink

Background and aims <p>In the context of climate change and climatic phenomena such as El Niño, understanding how resource availability shapes ecosystem functional responses is essential for evaluating nutrient availability and conservation in tropical ecosystems. However, the long-term residual effects of resource manipulation on soil chemical properties and litter dynamics remain poorly understood. This study aimed to assess the lasting impacts of irrigation and nutrient manipulation on litter dynamics and soil nutrient status, 16&#xa0;years after the experimental treatments had ceased.</p> Methods <p>We evaluated the chemical properties of soil and litter in a secondary forest in Eastern Amazonia, and we calculated the nutrient use efficiency (NUE) and litter nutrient release rate in three treatments: CTL (Control), IRR (Irrigation), REM (Nutrient Removal).</p> Results <p>Resource manipulation had a long-lasting effect on the dynamics of K, Ca, Mg, and P nutrients. IRR increased soil K availability (40.47&#xa0;mg&#xa0;dm<sup>−3</sup>) in 0–10&#xa0;cm depth, while REM reduced pH in 10–20&#xa0;cm depth (4.31) and monthly production of Ca, Mg, and P. The NUE of Ca and Mg could be impaired with increased rainfall, while higher temperatures provided greater N and P NUE. IRR was the treatment with the highest litter K release.</p> Conclusions <p>Litter removal disrupts nutrient cycling, whereas periodic irrigation improved better soil conditions. However, irrigation is economically unfeasible for most smallholder farmers. The results also support concerns about climate change impacts, which can interfere litterfall, nutrients availability, and water supply, potentially affecting forest growth in Amazonia even beyond a decade.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Litter removal has long-lasting harmful effects on nutrient dynamics in a tropical secondary forest

  • 期刊论文

  • 发表日期：

    2025年6月2日

查看全文
  • Julia Isabella de Matos Rodrigues,
  • Walmer Bruno Rocha Martins,
  • Victor Pereira de Oliveira,
  • Luiz Fernandes Silva Dionísio,
  • Hiago Felipe Cardoso Pacheco,
  • Marcos Alexandre Vieira Nascimento Filho,
  • Manoel Tavares de Paula,
  • Francisco de Assis Oliveira,
  • Gustavo Schwartz

摘要

Background and aims

In the context of climate change and climatic phenomena such as El Niño, understanding how resource availability shapes ecosystem functional responses is essential for evaluating nutrient availability and conservation in tropical ecosystems. However, the long-term residual effects of resource manipulation on soil chemical properties and litter dynamics remain poorly understood. This study aimed to assess the lasting impacts of irrigation and nutrient manipulation on litter dynamics and soil nutrient status, 16 years after the experimental treatments had ceased.

Methods

We evaluated the chemical properties of soil and litter in a secondary forest in Eastern Amazonia, and we calculated the nutrient use efficiency (NUE) and litter nutrient release rate in three treatments: CTL (Control), IRR (Irrigation), REM (Nutrient Removal).

Results

Resource manipulation had a long-lasting effect on the dynamics of K, Ca, Mg, and P nutrients. IRR increased soil K availability (40.47 mg dm−3) in 0–10 cm depth, while REM reduced pH in 10–20 cm depth (4.31) and monthly production of Ca, Mg, and P. The NUE of Ca and Mg could be impaired with increased rainfall, while higher temperatures provided greater N and P NUE. IRR was the treatment with the highest litter K release.

Conclusions

Litter removal disrupts nutrient cycling, whereas periodic irrigation improved better soil conditions. However, irrigation is economically unfeasible for most smallholder farmers. The results also support concerns about climate change impacts, which can interfere litterfall, nutrients availability, and water supply, potentially affecting forest growth in Amazonia even beyond a decade.