杉木幼树光合特性与生长的季节变化及其对土壤增温的响应

doi:10.13287/j.1001-9332.202401.006

应用生态学报 ›› 2024, Vol. 35 ›› Issue (1): 195-202.doi: 10.13287/j.1001-9332.202401.006

杉木幼树光合特性与生长的季节变化及其对土壤增温的响应

张雅婷^1,2,3, 叶旺敏^2,3, 熊德成^1,2,3*, 吴晨², 黄锦学², 陈仕东^1,2,3, 杨智杰^1,2,3

¹福建师范大学地理研究所, 福州 350007;
²福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007;
³福建三明森林生态系统国家野外科学观测研究站, 福建三明 365002

收稿日期:2023-07-27 接受日期:2023-11-28 出版日期:2024-01-18 发布日期:2024-03-21
通讯作者: * E-mail: xdc104@163.com
作者简介:张雅婷, 女, 1998年生, 硕士研究生。主要从事森林生态系统碳循环对全球变化的响应研究。E-mail: ZYT15254168565@163.com
基金资助:
国家自然科学基金项目(31901132,32071743,32192433)、福建省科技厅公益类项目(2022R1002004)和福建省自然科学基金面上项目(2021J01176)

Seasonal dynamics in photosynthetic characteristics and growth of Cunninghamia lanceolata saplings and their response to soil warming

ZHANG Yating^1,2,3, YE Wangmin^2,3, XIONG Decheng^1,2,3*, WU Chen², HUANG Jinxue², CHEN Shidong^1,2,3, YANG Zhijie^1,2,3

¹Institute of Geography, Fujian Normal University, Fuzhou 350007, China;
²Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350007, China;
³Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming 365002, Fujian, China

Received:2023-07-27 Accepted:2023-11-28 Online:2024-01-18 Published:2024-03-21

摘要/Abstract

摘要： 为了解亚热带地区杉木幼树光合特性与生长对全球变暖的响应与适应机制,本研究在福建三明森林生态系统国家野外科学观测研究站开展根箱增温试验(较环境温度增加4 ℃),探究土壤增温对亚热带杉木幼树不同季节光合特性与生长的影响。结果表明: 夏季杉木叶片净光合速率(P_n)与气孔导度(g_s)显著低于春季与秋季;土壤增温对各季节杉木叶片P_n和g_s均无显著影响,但增温与季节的交互作用对叶片水分利用效率(WUE)存在显著影响。春季杉木树高与地径生长均显著高于夏季与秋季;增温显著降低杉木地径生长,其中秋季显著降低48.1%;而增温对各季节杉木树高生长均无显著影响。夏季和秋季杉木比叶面积、可溶性糖和非结构性碳水化合物含量均显著高于春季,增温在各季节均未引起叶片功能性状的显著变化。综上,杉木光合作用对土壤增温的响应不显著,其季节差异显著主要受气孔导度调控。杉木通过调节WUE适应土壤增温,且通过提高可溶性糖含量和比叶面积适应夏季高温与干旱胁迫。增温对杉木地径生长的影响主要由土壤含水率驱动;杉木生长的季节差异受杉木光合作用及其对光合产物的利用与储存的权衡影响。

关键词: 全球变化, 中亚热带, 杉木, 生长特性, 光合速率

Abstract: In order to understand the response and adaptation mechanisms of photosynthetic characteristics and growth for Cunninghamia lanceolata saplings in the subtropical region to global warming, we conducted the root-box warming experiment (ambient, ambient+4 ℃) at the Sanming Forest Ecosystem National Observation and Research Station in Fujian Province to investigate the effects of soil warming on the photosynthetic characteristics and growth of C. lanceolata saplings in different seasons. The results showed that the net photosynthetic rate (P_n) and stomatal conductance (g_s) of C. lanceolata significantly decreased in summer compared with in spring and autumn. Soil warming had no effect on the P_n and g_s of C. lanceolata. However, the interaction between warming and season significantly impacted the leaf water use efficiency (WUE). The tree height and ground diameter growth of C. lanceolata significantly increased in spring compared with in summer and autumn. Warming significantly reduced ground diameter growth, and it diminished the net diameter growth by 48.1% in autumn. However, warming had no impact on the tree height growth of C. lanceolata in each season. The specific leaf area, soluble sugar, and non-structural carbohydrates contents of C. lanceolata significantly improved in summer and autumn compared with in spring. Warming had rarely influence on leaf functional traits in each season. In conclusion, the response of photosynthesis for C. lanceolata to soil warming was insignificant. The photosynthesis of C. lanceolata exhibited significant seasonal dynamics, primarily controlled by g_s. C. lanceolata adapted to soil warming by adjusting WUE, and it adjusted to high temperatures and drought stress in summer by increasing soluble sugar content and specific leaf area. The effect of warming on ground diameter growth of C. lanceolata was primarily driven by soil moisture. The seasonal difference in the growth of C. lanceolata was influenced by the photosynthesis of C. lanceolata and the trade-off between the utilization and storage of photosynthetic products.

Key words: global change, mid-subtropics, Cunninghamia lanceolata, growth characteristics, photosynthetic rate

张雅婷, 叶旺敏, 熊德成, 吴晨, 黄锦学, 陈仕东, 杨智杰. 杉木幼树光合特性与生长的季节变化及其对土壤增温的响应[J]. 应用生态学报, 2024, 35(1): 195-202.

ZHANG Yating, YE Wangmin, XIONG Decheng, WU Chen, HUANG Jinxue, CHEN Shidong, YANG Zhijie. Seasonal dynamics in photosynthetic characteristics and growth of Cunninghamia lanceolata saplings and their response to soil warming[J]. Chinese Journal of Applied Ecology, 2024, 35(1): 195-202.

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杉木幼树光合特性与生长的季节变化及其对土壤增温的响应

Seasonal dynamics in photosynthetic characteristics and growth of Cunninghamia lanceolata saplings and their response to soil warming

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