植物生态学报 ›› 2025, Vol. 49 ›› Issue (11): 1817-1832.DOI: 10.17521/cjpe.2024.0388  cstr: 32100.14.cjpe.2024.0388

• 研究论文 • 上一篇    下一篇

C4植物狗尾草功能性状网络沿降水梯度带的区域分异规律

童金莲1, 张博纳1, 汤璐瑶1, 叶琳峰1, 李姝雯1, 谢江波1,2, 李彦1,2, 王忠媛1,2,*()   

  1. 1浙江农林大学省部共建亚热带森林培育国家重点实验室, 浙江农林大学林业与生物技术学院, 杭州 311300
    2中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室, 乌鲁木齐 830011
  • 收稿日期:2024-10-31 接受日期:2025-01-10 出版日期:2025-11-20 发布日期:2025-11-20
  • 通讯作者: *王忠媛(wangzhongyuan2014@163.com)
  • 基金资助:
    国家自然科学基金(32371662);国家自然科学基金(42330503);浙江省科技厅重大专项(2022C02019)

Regional differentiation of functional trait network of C4 plants Setaria viridis along precipitation gradient

TONG Jin-Lian1, ZHANG Bo-Na1, TANG Lu-Yao1, YE Lin-Feng1, LI Shu-Wen1, XIE Jiang-Bo1,2, LI Yan1,2, WANG Zhong-Yuan1,2,*()   

  1. 1State Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China
    2State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Ürümqi 830011, China
  • Received:2024-10-31 Accepted:2025-01-10 Online:2025-11-20 Published:2025-11-20
  • Supported by:
    National Natural Science Foundation of China(32371662);National Natural Science Foundation of China(42330503);Major Special Project of Department of Science and Technology of Zhejiang Province(2022C02019)

摘要: 揭示广布种功能性状及其适应策略的区域分异规律, 对预测植物在气候变化下的适应潜力具有重要意义。该研究以广布种狗尾草(Setaria viridis)为实验对象, 沿降水梯度带选取9个样点, 测量了狗尾草茎和叶器官水碳相关的18个功能性状, 采用性状网络与主成分分析等方法, 阐明其生境适应策略。结果表明: (1)狗尾草在湿润区具有最大的导管直径和比叶质量; 在半湿润/半干旱区具有最高的单位面积最大净光合速率、解剖学最大气孔导度和气孔面积分数; 在干旱区具有最大的导管厚度跨度比和单位质量最大净光合速率; 反映了狗尾草在不同区域的适应策略。(2)随着降水的减少, 性状之间的关联变少, 网络的连通性降低, 复杂性增加。性状间正相关关系占比在半湿润/半干旱区达到最大, 此时植物性状间表现出最佳的协作关系, 可能与此区域水、光资源配置达到平衡有关。(3) 9个样点性状网络的结果表明狗尾草沿降水梯度带的适应主要由气孔性状调控。该研究对预测气候变化背景下的植物/植被响应及其潜在适应机制具有重要意义。

关键词: 植物功能性状, 性状变异, 适应策略, 广布种, 狗尾草, 降水梯度带

Abstract:

Aims Revealing the regional differentiation of functional traits and their adaptative strategies of widely distributed species is of great ecological significance for predicting the adaptation of plants under climate change.

Methods Setaria viridiswas studied for its 18 water-carbon-related stem and leaf traits in 9 study sites along the precipitation gradient from southeast to northwest China. The trait network analysis and principal component analysis were used to quantify the regional differentiation of traits to clarify their habitat adaptative strategies.

Important findings (1) In humid regions, Setaria viridis exhibited the largest vessel diameter and specific leaf mass; in the semiarid/semihumid region, Setaria viridis exhibited the highest maximum net photosynthetic rate per unit leaf area, anatomical maximum stomatal conductance and stomatal area fraction; in arid regions, Setaria viridis exhibited the highest thickness-to-span ratio of vessel and maximum net photosynthetic rate per unit leaf mass. These trait variations revealed the adaptative strategies of Setaria viridis in different regions. (2) Both the correlations between traits and the connectivity of the network decreased with the decrease of precipitation, while the complexity of the network increased. The proportion of positive correlations among the trait network reached the maximum in the semiarid/semihumid regions, showing the best cooperative relationship between plant traits, which may be related to the balanced allocation of water and light resources in this region. (3) The trait network of nine sites indicated that the adaptation of Setaria viridis along the precipitation gradient was mainly regulated by stomatal traits. This study helps us to reveal the mechanisms of plant adaptation under the background of climate change.

Key words: plant functional trait, trait variation, adaptive strategy, widely distributed species, Setaria viridis, precipitation gradient