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<p>Carbon (C), nitrogen (N), and phosphorus (P) are essential elements for plant growth and metabolism, with their stoichiometry playing a pivotal role in ecosystem functioning. In tea plantations, fertilization strongly influences the balance of these elements. However, the effects of organic fertilizers on the leaf C, N, and P contents and their stoichiometry in tropical tea plants remain poorly understood. In this study, we examined the impact of organic fertilizer on the leaf C, N, and P contents and their ratios of <i>Camellia sinensis</i> var. <i>assamica</i> (CSA) and <i>Camellia sinensis</i> var. <i>sinensis</i> (CSS) in Hainan, China. Our findings indicated that organic fertilizer significantly increased leaf N and P contents but had no effect on leaf C content. Additionally, organic fertilizer significantly decreased leaf C: N ratio of CSA and CSS, as well as leaf C: P ratio of CSA, but significantly increased leaf N: P ratio of CSS. Soil organic carbon (SOC), total N, and total P also increased, while their stoichiometric ratios decreased in CSA but not CSS. In the unfertilized tea plantation, leaf C, N, and P contents and their stoichiometry of CSA and CSS were significantly correlated with soil NO<sub>3</sub><sup>−</sup>-N, whereas they were significantly correlated with soil NH<sub>4</sub><sup>+</sup>-N in the fertilized tea plantation. Our results suggest that the differential responses of leaf C, N, and P contents of CSA and CSS to organic fertilizer might be attributed to the distinct leaf physiological characteristics of these two tea plant species.</p>

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Increased organic fertilizer significantly increases leaf nitrogen and phosphorus but not carbon content in a tropical tea plantation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月19日

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  • Jing-li Lu,
  • Ying Wang,
  • Di Li,
  • Qiu Yang,
  • Yamin Jiang,
  • Peng Wang,
  • Tianyan Su,
  • Geming Li,
  • Qian Shi,
  • Huai Yang,
  • Wenjie Liu,
  • Mengyang Fang

摘要

Carbon (C), nitrogen (N), and phosphorus (P) are essential elements for plant growth and metabolism, with their stoichiometry playing a pivotal role in ecosystem functioning. In tea plantations, fertilization strongly influences the balance of these elements. However, the effects of organic fertilizers on the leaf C, N, and P contents and their stoichiometry in tropical tea plants remain poorly understood. In this study, we examined the impact of organic fertilizer on the leaf C, N, and P contents and their ratios of Camellia sinensis var. assamica (CSA) and Camellia sinensis var. sinensis (CSS) in Hainan, China. Our findings indicated that organic fertilizer significantly increased leaf N and P contents but had no effect on leaf C content. Additionally, organic fertilizer significantly decreased leaf C: N ratio of CSA and CSS, as well as leaf C: P ratio of CSA, but significantly increased leaf N: P ratio of CSS. Soil organic carbon (SOC), total N, and total P also increased, while their stoichiometric ratios decreased in CSA but not CSS. In the unfertilized tea plantation, leaf C, N, and P contents and their stoichiometry of CSA and CSS were significantly correlated with soil NO3−-N, whereas they were significantly correlated with soil NH4+-N in the fertilized tea plantation. Our results suggest that the differential responses of leaf C, N, and P contents of CSA and CSS to organic fertilizer might be attributed to the distinct leaf physiological characteristics of these two tea plant species.