Fan Aifei, Jin Songheng, Tan Yangzhou, Huan Weiwei, Chen Wenjing, Wang Xiaoyu, Han Yini
Jiyang College, Zhejiang A&F University, Zhuji, China.
School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China.
Front Plant Sci. 2025 Apr 17;16:1566140. doi: 10.3389/fpls.2025.1566140. eCollection 2025.
The intrinsic relationships among plants, litter, and soil nutrient characteristics, along with the responses of ecological stoichiometry to nutrient utilization, are critical for understanding the mechanisms of nutrient cycling. However, limited research in this area has constrained our comprehension of nutrient dynamics within ecosystems.
To investigate the stoichiometric characteristics and nutrient resorption traits of Torreya grandis plantations across various stand ages, as well as their adaptive strategies and nutrient utilization mechanisms under local growth conditions, we conducted a study in the Forest Park. This study examined five stand age groups: young (20 years), near-mature (50 years), mature (80 years), over-mature (100 years), and thousand (1,000 years). We measured the nutrient contents of soil, fresh leaves, and litterfall, and analyzed their stoichiometric relationships and nutrient resorption characteristics.
1.The growth of plantations was primarily limited by nitrogen (N) during the early stages, transitioning to phosphorus (P) limitation with increasing stand age, particularly in the over-mature stage. High C:N and C:P ratios in leaves indicated low N and P use efficiency. 2.Leaf nutrient concentrations remained relatively stable across different stand ages, whereas nutrient concentrations in litterfall gradually declined, indicating an increase in nutrient cycling efficiency. Meanwhile, soil nutrient accumulation showed a gradual increase with stand development. exhibited distinct nutrient resorption strategies at different stand ages: phosphorus resorption efficiency (PRE) was higher in young stands, whereas nitrogen resorption efficiency (NRE) significantly increased in mature and over-mature stands. Furthermore, this nutrient allocation mechanism influenced the nutritional content of seeds, highlighting the significant impact of stand age on seed quality. 3.The nutrient characteristics of plantations are influenced by both stand age and soil nutrient availability.Management practices should prioritize the supplementation of soil nutrients, particularly P, and the enhancement of nutrient cycling efficiency.
This study offers a scientific foundation for the sustainable management and production of plantations in the region, highlighting the importance of targeted soil nutrient management to improve ecosystem productivity and sustainability.
植物、凋落物和土壤养分特征之间的内在关系，以及生态化学计量对养分利用的响应，对于理解养分循环机制至关重要。然而，该领域的研究有限，限制了我们对生态系统内养分动态的理解。
为了研究不同林龄的榧树人工林的化学计量特征和养分重吸收特性，以及它们在当地生长条件下的适应策略和养分利用机制，我们在森林公园进行了一项研究。本研究调查了五个林龄组：幼龄林（20年）、近熟林（50年）、成熟林（80年）、过熟林（100年）和千年林（1000年）。我们测量了土壤、鲜叶和凋落物的养分含量，并分析了它们的化学计量关系和养分重吸收特征。
1.人工林生长在早期主要受氮（N）限制，随着林龄增加逐渐转变为受磷（P）限制，特别是在过熟阶段。叶片中高的碳氮比和碳磷比表明氮和磷利用效率低。2.不同林龄的叶片养分浓度相对稳定，而凋落物中的养分浓度逐渐下降，表明养分循环效率提高。同时，土壤养分积累随着林分发育逐渐增加。不同林龄表现出不同的养分重吸收策略：幼龄林中磷重吸收效率（PRE）较高，而成熟林和过熟林中氮重吸收效率（NRE）显著增加。此外，这种养分分配机制影响了种子的营养含量，突出了林龄对种子质量的重大影响。3.榧树人工林的养分特征受林龄和土壤养分有效性的影响。管理措施应优先补充土壤养分，特别是磷，并提高养分循环效率。
本研究为该地区榧树人工林的可持续经营和生产提供了科学依据，突出了针对性土壤养分管理对提高生态系统生产力和可持续性的重要性。
