Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (22): 20-30.doi: 10.11924/j.issn.1000-6850.casb2021-0772

Special Issue: 生物技术 园艺

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Leaf Stoichiometric Characteristics of Japanese Red Pine Forest in Shandong Province and Their Correlation with Stand Characteristics and Soil Nutrients

LI Zongtai1,2(), ZHAN Lijie3, LIANG Yan1,2, GE Zhongqiang1,2, CAO Zhenfei4, DU Zhenyu1,2(), DUN Xingjian1,2   

  1. 1Shandong Academy of Forestry, Jinan 250014
    2Forest Ecosystem Research Station of the Yellow River Delta in Shandong,Dongying, Shandong 257000
    3Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan 250100
    4Shandong Territorial Ecological Restoration Center, Jinan 250014
  • Received:2021-08-10 Revised:2021-11-10 Online:2022-08-05 Published:2022-08-22
  • Contact: DU Zhenyu E-mail:lizongtai2005@126.com;zydu@qq.com

Abstract:

Pinus densiflora is one of the important native tree species in Shandong Province. The stoichiometric characteristics of carbon (C), nitrogen (N) and phosphorus (P) in leaves of P. densiflora in Shandong Province and their relationship with stand characteristics and soil nutrients were investigated to assess health status of plantations of P. densiflora and carry out fertilization management. From August to September in 2018, we conducted stand growth surveys on 20 plantations of P. densiflora in Shandong Province, and collected leaf and soil (0-20 cm) samples. Leaf stoichiometric characteristics, stand characteristics and soil nutrients' contents, as well as their relationships were analyzed. The results showed that the average content of C, N and P in the leaves of P. densiflora was 636.35, 12.80 and 0.82 g/kg, respectively, and the average value of C:N, C:P and N:P was 50.74, 800.48 and 15.93, respectively. It was found that the leaf N content was significantly and positively correlated with diameter at breast height and forest age, and significantly and negatively correlated with stand density. However, leaf C:N showed a negative correlation with forest age. Moreover, leaf C content and C:P showed significantly negative linear dependence upon the contents of soil organic matter and soil alkali-hydrolyzed N. In addition, leaf N content was significantly and positively correlated with soil nutrients' contents, whereas leaf C:N was significantly and negatively correlated with soil nutrients' contents. The leaf N content of P. densiflora was significantly and linearly correlated with stand characteristics and soil nutrients. Furthermore, P was a restrictive factor for P. densiflora in Shandong Province during its growth and development.

Key words: stoichiometry, C, N and P, soil nutrient, stand characteristics, Pinus densiflora, leaf

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