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Bulletin of Botanical Research ›› 2021, Vol. 41 ›› Issue (5): 760-774.doi: 10.7525/j.issn.1673-5102.2021.05.015

• Research report • Previous Articles    

Effects of Site and Age Group on Leaf Ecology Stoichiometric Characteristics of Cupressus funebris Plantations in Sichuan Province

Si-Meng SONG1, Yang ZHOU1, Jian ZHANG2,3()   

  1. 1.Agricultural College,Sichuan Minzu College,Research Center for Ecological Restoration and Characteristic Industry Cultivation in Hengduan Mountains Region,Kangding 626001
    2.Institute of Ecology & Forestry,Sichuan Agriculture University,Monitoring Station for Eco-environments in the Rainy Zone of Southwest China,Chengdu 611130
    3.Key Laboratory of Ecological Forestry Engineering of Sichuan Province,Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River,Chengdu 611130
  • Received:2020-05-29 Online:2021-09-20 Published:2021-07-05
  • Contact: Jian ZHANG E-mail:sicauzhangjian@163.com
  • About author:SONG Si-Meng(1993—),female,assistant,master,mainly engaged in forest cultivation and plant resources study.
  • Supported by:
    National Natural Science Foundation of China(31370628);Key Sci-tech Project of China(2011BAC09B05);Key Sci-tech Project of Sichuan Province(12ZC0017);Applied Basis Project of Sichuan Provincial Science and Technology Department(2012JY0047);Technology Innovation Team Project of Sichuan Education Department(11TD006);Characteristic Research Incubation Project of Sichuan Minzu College(KBFHB19014);Scientific Research Project of Sichuan Minzu College“Biomass and agronomic characters of Pennisetum sinese under different water-fertilizer coupling treatment”

Abstract:

The experiment was conducted to study the leaf C, N, P stoichiometric characteristics of Cupressus funebris plantations in Sichuan Province and their responses to site change and age group for understanding the leaf nutrient distribution patterns of C. funebris in different age groups and site types. In order to determine the effects of site and age group on the leaf stoichiometric characteristics of C. funebris plantations, 70 standard plots were selected for the site classification in the main distribution areas of C. funebris plantations. Leaves from different age groups(young stand, half-mature stand, and near mature stand) of C. funebris werecollected, and the C, N, P contents of leaf were measured respectively. The plots were classified into 2 site type districts, 4 site type groups, 8 site type subgroups and 17 site types. The average leaf C, N, P contents of C. funebris in Sichuan were(550.55 ± 18.08) g·kg-1, (9.39 ± 0.20) g·kg-1, (0.95 ± 0.12) g·kg-1, and the C∶N ratio, C∶P ratio, N∶P ratio of which were 58.70 ± 3.04, 583.68 ± 44.59, 9.93 ± 0.37, respectively. Leaf C, N, P contents and C∶N, C∶P, N∶P ratios were all affected by site type and age group significantly(P<0.05). Within the same age group, the leaf C content, C∶N ratio and C∶P ratio of C. funebris in the mountainous site type district were significantly higher than those in the hill site type district; in the acid purple soil site type group were significantly higher than those in the calcareous purple soil site type group in each district; in the lower slope site type subgroup were significantly higher than those in the middle and upper slope site type subgroup and the top slope site type subgroup in each group of hill site type district; in the thin soil site type of hill site type district were significantly higher than those in the medium soil site type; in the sunny slope site type subgroup were significantly higher than those in the shady slope site type subgroup in each group of mountainous site type district; and in the groove site type of mountainous site type district were significantly higher than those in the slope and ridge site type, however, the leaf N and P contents of C. funebris showed the opposite trends. Within the same site type, the leaf C content, C∶N ratio and C∶P ratio increased continuously, and the N and P contents decreased continuously from the young stand to the near mature stand. The growth of C. funebris plantations may be restricted by N and more obvious in the early growth stage. In summary, we suggested to cultivate the C. funebris plantations in the site conditions such as the combination of “acid purple soil in groove on sunny slope of mountain” or “thin acid purple soil on lower slope of hill”, and apply N fertilizer in early growth stage to alleviate the possible nutritional restrictions.

Key words: ecology stoichiometry, Cupressus funebris plantation, leaf, site type, age group

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