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FOREST RESOURCES WANAGEMENT ›› 2023›› Issue (4): 62-70.doi: 10.13466/j.cnki.lyzygl.2023.04.008

• Scientific Research • Previous Articles     Next Articles

Ecological Stoichiometry Characteristics of C,N and P of Different Components in Premature Aging Plantation Forests of Hippophae rhamnoides ssp.sinensis

LI Zhongmu1(), NIE Kaihong2, TIAN Dengjuan1, LIU Shenghong1, LU Sai1, LI Genqian1()   

  1. 1. College of Forestry,Southwest Forestry University,Kunming 650224,China
    2. Zhaohua Forestry Bureau of Guangyuan city,Guangyuan,Sichuan 628060,China
  • Received:2023-06-20 Revised:2023-07-09 Online:2023-08-28 Published:2023-10-16

Abstract:

Sprouting regeneration is one of the main ways in which trees recover from harsh environments or disturbances.In order to understand the nutrient allocation pattern of each component of premature aging in Chinese buckthorn plantations,and to explore the relative accumulation rate of nutrients between rejuvenated offspring and aging mother plants.The stoichiometric characteristics of carbon(C),nitrogen(N)and phosphorus(P)of different components of 15a stands with premature aging characteristics were analyzed.The results showed that:1)The C,N and P content of each components ranged from 255.07~563.68,7.34~24.68 and 0.23~0.68 mg/g,and the C∶N,C∶P and N∶P ratios were 19.63~39.86,648.31~1 188.26 and 26.88~45.47,which differed among the components.2)The accumulation rate of C in the leaves,horizontal roots,and vertical roots of the mother plant was less than that of N or P.The accumulation rate of C in the trunk of the daughter plant was greater than that of N and P,and the accumulation rate of N in the horizontal roots was greater than that of P.3)In the combined change of C,N and P content,trunk of daughter plants,leaves of daughter plants and vertical roots contributed the most,while leaves of mother plants and horizontal roots contributed the least.It follows that:the carbon,nitrogen,and phosphorus accumulation capacity of Chinese buckthorn and its stoichiometric ratio differed among the components,with a greater role played by offspring compared to mother plants and vertical roots compared to horizontal roots.The main nutritional characteristics of premature aging plantations are low carbon accumulation capacity and low C∶N and C∶P ratios in mother plant leaves and horizontal roots,which means that "carbon limitation" or "carbon starvation" is the main nutritional reason for premature aging in plantations.

Key words: carbon, nitrogen and phosphorus, ecological chemometric characteristics, structure differences, premature decline, Hippophae rhamnoides ssp.sinensis plantation forest

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