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Forest and Grassland Resources Research >

2024 , Vol. 0 >Issue 4: 135 - 146

DOI: https://doi.org/10.13466/j.cnki.lczyyj.2024.04.015

Technical Application

Effects of Nitrogen Application and Mixed Planting of Nitrogen-Fixing Tree Species on Phosphorus Distribution and Growth of Eucalyptus urophylla×grandis

  • Zihua LI ,
  • Xianyu YAO ,
  • Zihua LIAO ,
  • Junfei XIONG ,
  • Shaoming YE
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  • 1. School of Forestry,Guangxi University,Nanning 530004,China
    2. South China Botanical Garden,Chinese Academy of Science,Guangzhou 510650,China
    3. Guangxi Key Laboratory of Forest Ecology and Conservation,Nanning 530004,China
    4. Experimental Centre of Tropical Forestry,Chinese Academy of Forestry,Pingxiang 532600,China
    5. Guangxi Key Laboratory of Subtropical Artificial Forest Cultivation and Utilization of Higher Education Institutions,Nanning 530004,China

Received date: 2024-05-15

  Revised date: 2024-08-02

  Online published: 2025-04-18

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Abstract

Mixing nitrogen-fixing tree species with Eucalyptus urophylla×grandis can enhance soil nitrogen(N)content.However,excessive N may disrupt the N:P ratio and intensify phosphorus(P)limitation for Eucalyptus urophylla×grandis.Understanding the effects of N-fixing tree species on soil N and P content and Eucalyptus urophylla×grandis P nutrients is essential for sustainable nutrient management in Eucalyptus urophylla×grandis plantations.This study included three treatments:Eucalyptus urophylla×grandis mixed with N-fixing species(ME),pure Eucalyptus urophylla×grandis plantation with N application(NE)and pure Eucalyptus urophylla×grandis plantation without fertilization(PE).And this study analyze the differences and seasonal dynamics of soil N and P levels,Eucalyptus urophylla×grandis biomass,P concentration and P accumulation in Eucalyptus urophylla×grandis plants.The results showed that both ME and NE treatments significantly increased soil total N content(from 36% to 46%),available N content(from 20% to 40%),Eucalyptus urophylla×grandis biomass(from 16% to 23%)and P accumulation(from 16% to 36%)compared to the PE treatment.In the ME treatment,the soil available N:P ration remained balanced,whereas it significantly increased in the NE treatment.The P concentration in Eucalyptus urophylla×grandis organs showed the order of ME>PE>NE.Correlation analysis revealed that leaf P concentration was influenced by soil available P(16.42%)and the soil available N:P ratio(15.13%).Both N application and introduction of N-fixing tree species treatments significantly increased soil N content.However,N application decreased phosphorus concentration and AP in all organs of Eucalyptus urophylla×grandis,which aggravated the phosphorus limitation in the later stage of Eucalyptus urophylla×grandis.The mixed treatment of nitrogen-fixing tree species maintained the balance of AP content and the AN:AP ration,alleviating N and P limitations and promoting long-term Eucalyptus urophylla×grandis growth.In the short term,introducing nitrogen-fixing tree species improved soil N and P stability and promoted Eucalyptus urophylla×grandis growth.

Key words： mixed forest; nitrogen-fixing tree species; phosphorus concentration; biomass

Cite this article

Zihua LI , Xianyu YAO , Zihua LIAO , Junfei XIONG , Shaoming YE . Effects of Nitrogen Application and Mixed Planting of Nitrogen-Fixing Tree Species on Phosphorus Distribution and Growth of Eucalyptus urophylla×grandis[J]. Forest and Grassland Resources Research, 2024 , 0(4) : 135 -146 . DOI: 10.13466/j.cnki.lczyyj.2024.04.015

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