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<p>Soil nutrient limitation conditions change with stand development, however, whether nutrient acquisition strategies are sensitive to nutrient limitation remains unclear. A field nitrogen (N) and phosphorus (P) addition experiment was conducted in Chinese fir (<i>Cunninghamia lanceolata</i>) plantations at seven different stand ages. We used soil coring and ingrowth core to measure biomass and productivity. Mycorrhizal colonization and hyphal length were determined using ink-vinegar dyeing and membrane filtration method. In addition, intact fine roots were excavated for functional trait analysis, and carbon concentration in root exudation was measured using TOC analyzer. The fine root biomass and productivity decreased but the mycorrhizal colonization rate and root exudation increased with stand age. After 2-year N and P additions, the fine root biomass and productivity decreased at early stand development stage (&lt; 21&#xa0;years) and increased at late stage. The mycorrhizal colonization rate and hyphal length density decreased while morphological traits did not change significantly across stand ages. The root exudation increased after N addition but did not significantly change after P addition. In the control plots, Chinese fir shifts the nutrient acquisition strategies from “do-it-yourself” (fine root biomass and productivity) in younger stands to “outsourcing” (collaboration with mycorrhizal fungi) in mature stands. Nutrient additions reduced fine root biomass and productivity in early stands but increased them in later stands, while decreasing mycorrhizal colonization across all ages. These shifts indicate that nutrient addition favors “do-it-yourself” nutrient acquisition strategies by maintaining a low but sufficient biomass. These findings help improve understanding of plant soil interaction on carbon allocation and provide insightful information for soil nutrient management in the context of global change.</p>

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Nitrogen and phosphorus additions induced fine roots decoupling from mycorrhiza and favored nutrient acquisition strategies of do-it-yourself in Chinese fir plantations

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Can Li,
  • Shuai Ouyang,
  • Huili Wu,
  • Liang Chen,
  • Xiangwen Deng,
  • Yanting Hu,
  • Yelin Zeng,
  • Wenhua Xiang

摘要

Soil nutrient limitation conditions change with stand development, however, whether nutrient acquisition strategies are sensitive to nutrient limitation remains unclear. A field nitrogen (N) and phosphorus (P) addition experiment was conducted in Chinese fir (Cunninghamia lanceolata) plantations at seven different stand ages. We used soil coring and ingrowth core to measure biomass and productivity. Mycorrhizal colonization and hyphal length were determined using ink-vinegar dyeing and membrane filtration method. In addition, intact fine roots were excavated for functional trait analysis, and carbon concentration in root exudation was measured using TOC analyzer. The fine root biomass and productivity decreased but the mycorrhizal colonization rate and root exudation increased with stand age. After 2-year N and P additions, the fine root biomass and productivity decreased at early stand development stage (< 21 years) and increased at late stage. The mycorrhizal colonization rate and hyphal length density decreased while morphological traits did not change significantly across stand ages. The root exudation increased after N addition but did not significantly change after P addition. In the control plots, Chinese fir shifts the nutrient acquisition strategies from “do-it-yourself” (fine root biomass and productivity) in younger stands to “outsourcing” (collaboration with mycorrhizal fungi) in mature stands. Nutrient additions reduced fine root biomass and productivity in early stands but increased them in later stands, while decreasing mycorrhizal colonization across all ages. These shifts indicate that nutrient addition favors “do-it-yourself” nutrient acquisition strategies by maintaining a low but sufficient biomass. These findings help improve understanding of plant soil interaction on carbon allocation and provide insightful information for soil nutrient management in the context of global change.