%0 Journal Article
%A Jian ZHANG
%A Si-Meng SONG
%A Yang ZHOU
%T Effects of Site and Age Group on Leaf Ecology Stoichiometric Characteristics of <i>Cupressus funebris</i> Plantations in Sichuan Province
%D 2021
%R 10.7525/j.issn.1673-5102.2021.05.015
%J Bulletin of Botanical Research
%P 760-774
%V 41
%N 5
%X <p>The experiment was conducted to study the leaf C， N， P stoichiometric characteristics of <i>Cupressus funebris</i> plantations in Sichuan Province and their responses to site change and age group for understanding the leaf nutrient distribution patterns of <i>C. funebris</i> in different age groups and site types. In order to determine the effects of site and age group on the leaf stoichiometric characteristics of <i>C. funebris</i> plantations， 70 standard plots were selected for the site classification in the main distribution areas of <i>C. funebris</i> plantations. Leaves from different age groups（young stand， half-mature stand， and near mature stand） of <i>C. funebris </i>were<italic/>collected， 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 <i>C. funebris</i> in Sichuan were（550.55 ± 18.08） g·kg<sup>-1</sup>， （9.39 ± 0.20） g·kg<sup>-1</sup>， （0.95 ± 0.12） g·kg<sup>-1</sup>， 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（<i>P&lt;</i>0.05）. Within the same age group， the leaf C content， C∶N ratio and C∶P ratio of <i>C. funebris</i> 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 <i>C. funebris</i> 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 <i>C. funebris</i> plantations may be restricted by N and more obvious in the early growth stage. In summary， we suggested to cultivate the <i>C. funebris</i> 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.</p>
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2021.05.015