Scholarlink

<p><UnorderedList Mark="Bullet"> <ItemContent> <p>Eleven years of N addition decreased soil soluble P and organic P, consequently reducing P availability.</p> </ItemContent> <ItemContent> <p>Eleven years of N addition reduced soil microbial biomass and fine root biomass.</p> </ItemContent> <ItemContent> <p>Reductions in microbial biomass and fine root biomass mainly drove the declines in soluble P and organic P.</p> </ItemContent> </UnorderedList></p><p>Plant roots and microorganisms are integral to the phosphorus (P) transformation process in forest soils. However, the specific mechanisms by which they affect soil P availability under long-term nitrogen (N) addition remain elusive. Therefore, a long-term N addition experiment was conducted in a temperate forest in China. After 11-year N addition, measurements focused on P fractions, soil microbial biomass (SMB), microbial community (PLFAs), phosphatase activity, fine root biomass (FRB), and fine root biomass P (FRBP). The results demonstrated that N addition significantly decreased Resin-P and total extractable organic P (Po), while having no significant effect on total extractable inorganic P (Pi). Moreover, a strong positive correlation was observed between Resin-P and total extractable Po, suggesting that under N addition, organic P serves as the primary source of soluble P. This implies that continuous N deposition may exhaust the potential P source stored as organic P in forest soils. N addition also led to a reduction in SMB and FRB. Notably, microbial biomass P and FRBP were positively correlated with Resin-P and total extractable Po, indicating that the decrease in SMB and FRB is the main contributor to the decline in soluble P and organic P. Additionally, N addition significantly reduced phosphatase activity, suggesting an inhibition of the organic P hydrolysis process. In conclusion, N addition decreases P input into the soil by reducing SMB and FRB, and inhibits the transformation of different P forms by lowering enzyme activity. Consequently, soil organic P and soluble P decline, further intensifying P limitation.</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

Eleven-year nitrogen addition exacerbates phosphorus limitation by reducing plant roots and soil microbial biomass in a temperate forest

  • 期刊论文

  • 发表日期：

    2025年6月13日

查看全文
  • Xiaoli Gao,
  • Guoqin Wu,
  • Yuanchun Yu,
  • Liang Chen,
  • Yinmei Gao,
  • Kanwal Iqbal,
  • Xiaochun Yuan,
  • Juyan Cui,
  • Shenglei Fu

摘要

Eleven years of N addition decreased soil soluble P and organic P, consequently reducing P availability.

Eleven years of N addition reduced soil microbial biomass and fine root biomass.

Reductions in microbial biomass and fine root biomass mainly drove the declines in soluble P and organic P.

Plant roots and microorganisms are integral to the phosphorus (P) transformation process in forest soils. However, the specific mechanisms by which they affect soil P availability under long-term nitrogen (N) addition remain elusive. Therefore, a long-term N addition experiment was conducted in a temperate forest in China. After 11-year N addition, measurements focused on P fractions, soil microbial biomass (SMB), microbial community (PLFAs), phosphatase activity, fine root biomass (FRB), and fine root biomass P (FRBP). The results demonstrated that N addition significantly decreased Resin-P and total extractable organic P (Po), while having no significant effect on total extractable inorganic P (Pi). Moreover, a strong positive correlation was observed between Resin-P and total extractable Po, suggesting that under N addition, organic P serves as the primary source of soluble P. This implies that continuous N deposition may exhaust the potential P source stored as organic P in forest soils. N addition also led to a reduction in SMB and FRB. Notably, microbial biomass P and FRBP were positively correlated with Resin-P and total extractable Po, indicating that the decrease in SMB and FRB is the main contributor to the decline in soluble P and organic P. Additionally, N addition significantly reduced phosphatase activity, suggesting an inhibition of the organic P hydrolysis process. In conclusion, N addition decreases P input into the soil by reducing SMB and FRB, and inhibits the transformation of different P forms by lowering enzyme activity. Consequently, soil organic P and soluble P decline, further intensifying P limitation.