%0 Journal Article
%A Dingxu KANG
%A Hongbo LI
%A Huancheng MA
%A Jianrong WU
%A Shi CHEN
%A Yaohua HUANG
%T Ecological Stoichiometry and Homeostasis of Alpine <i>Quercus semicarpifolia</i> Leaves in Subalpine Zone of Hengduan Mountains
%D 2023
%R 10.7525/j.issn.1673-5102.2023.06.014
%J Bulletin of Botanical Research
%P 923-931
%V 43
%N 6
%X <p>To reveal the ecological adaptation mechanism of <i>Quercus semicarpifolia</i> in the subalpine zone of the Hengduan Mountains， the leaves and growing soil of eight plots were selected， and the C， N and P contents and their stoichiometric characteristics of leaves and growing substrate soil were measured， and the growth-limiting elements were determined. The ecological stoichiometry homeostasis model was used to determine the state of the alpine <i>Quercus</i> leaves. The soil C， N and P contents of the selected eight plots ranged from 38.86-70.19， 3.54-9.46 and 0.61-2.05 g?kg<sup>-1</sup>， with soil <i>ω</i>（C）∶<i>ω</i>（N） 5.65-16.07， <i>ω</i>（C）∶<i>ω</i>（P） 36.98-74.42 and <i>ω</i>（N）∶<i>ω</i>（P） 4.41-12.90， mean values were 9.48， 51.79 and 6.54， respectively. Leaf C， N and P contents ranged from 428.31-473.86， 21.22-31.68 and 2.21-3.68 g?kg<sup>-1</sup>， leaf <i>ω</i>（C）∶<i>ω</i>（N）， <i>ω</i>（C）∶<i>ω</i>（P）， and <i>ω</i>（N）∶<i>ω</i>（P） were 14.16-22.46， 121.41-215.86 and 6.99-12.84， with mean values of 17.36， 164.39 and 9.68， respectively. The alpine <i>Quercus</i> leaf N and P contents were higher than the global average. Leaf N and soil P， leaf N and soil <i>ω</i>（C）∶<i>ω</i>（N）， leaf <i>ω</i>（C）∶<i>ω</i>（P） and soil <i>ω</i>（N）∶<i>ω</i>（P）， leaf <i>ω</i>（C）∶<i>ω</i>（N） and soil <i>ω</i>（N）∶<i>ω</i>（P）， and leaf <i>ω</i>（C）∶<i>ω</i>（P） and leaf <i>ω</i>（N）∶<i>ω</i>（P） were highly significantly and positively correlated in each plot （<i>P</i>&lt;0.01）. In addition，the leaf stoichiometric homeostasis index of alpine <i>Quercus</i> were probed in terms of 1/<i>H</i> absolute values， while 1/<i>H<sub>ω</sub></i><sub>（N）</sub> was -0.181-0.141， 1/<i>H<sub>ω</sub></i><sub>（P） </sub>was -1.255-1.206， and 1/<i>H</i><sub>［</sub><i><sub>ω</sub></i><sub>（N）∶</sub><i><sub>ω</sub></i><sub>（P）］ </sub>was 0.391-0.960. The results indicated that each alpine <i>Quercus</i> 1/<i>H<sub>ω</sub></i><sub>（N）</sub> was in the homeostasis state， 1/H <i><sub>ω</sub></i><sub>（P）</sub> and 1/<i>H</i><sub>［</sub><i><sub>ω</sub></i><sub>（N）∶</sub><i><sub>ω</sub></i><sub>（P）］</sub> were mostly in the weakly homeostasis state， weakly sensitive and sensitive state. Leaf <i>ω</i>（N）∶<i>ω</i>（P） ratio was less than or close to 16， illustrating that alpine <i>Quercus</i> in this region tended to be not deficient in both N and P elements. Alpine <i>Quercus</i> might overstore N and P elements to adapt to the changing external habitat， but still had a more conservative strategy for the use of external P elements. The alpine <i>Quercus</i> forests in this region had formed a good nutrient supply and return relationship with the soil in the long-term succession process， which had formed a relatively complete and stable subalpine forest ecosystem.</p>
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2023.06.014