三峡消落带优势植物狗牙根在水库落干期的叶性状变化

张爱英; 樊大勇; 马良; 杨丹; 熊高明; 谢宗强

doi:10.11913/PSJ.2095-0837.2022.40453

三峡消落带优势植物狗牙根在水库落干期的叶性状变化

张爱英^1,2,
樊大勇²,
马良³,
杨丹⁴,
熊高明²,
谢宗强^2, ,

1. 中国计量大学, 杭州 310018;
2. 中国科学院植物研究所, 植被与环境变化国家重点实验室, 北京 100093;
3. 陕西省矿产地质调查中心, 西安 710068;
4. 贵州大学生命科学学院, 贵阳 550025

基金项目:

国家自然科学基金(31901211)

浙江省自然科学基金探索项目(LY21C030006)

中国科学院知识创新工程项目(KZCX2-XB3-09)。

详细信息

作者简介:
张爱英(1989-),女,博士,助理研究员,主要研究方向为植物生理生态学和植物群落生态学(E-mail:ayzhang@foxmail.com)。

通讯作者:
谢宗强,E-mail:xie@ibcas.ac.cn

中图分类号: Q948
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出版历程
- 收稿日期: 2022-01-17
- 修回日期: 2022-06-05
- 网络出版日期: 2022-10-31
- 发布日期: 2022-08-27

Intra-annual variations in leaf traits of Cynodon dactylon (L.) Pers. during exposure period in riparian zone of Three Gorges Reservoir Area

1. China Jiliang University, Hangzhou 310018, China;
2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
3. Shaanxi Mineral Resources and Geological Survey, Xi'an 710068, China;
4. College of Life Sciences, Guizhou University, Guiyang 550025, China

Funds:

This work was supported by grants from the National Natural Science Foundation of China (31901211),Natural Science Foundation of Zhejiang Province (LY21C030006),and the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-XB3-09).

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摘要

摘要: 为研究三峡消落带植物叶片功能性状在落干期的变化，于2014年6月和8月，在湿- 干- 湿循环的落干阶段，分别在176、170、164、158 m(不同淹水强度)调查消落带优势草本植物狗牙根(Cynodon dactylon (L.) Pers)的8个叶片功能性状，包括：最大净光合速率(A_area、A_mass)、比叶面积(SLA)、气孔导度(G_s)、叶片氮含量(N_area、N_mass)、叶片磷含量(P_area、P_mass)。结果显示：(1)生长时长(6月和8月)对A_area、A_mass、G_s、SLA和P_mass的变异性贡献率与淹水强度相近甚至高于后者，而生长时长对N_area、N_mass和P_area变异性的贡献率较低；(2)在8个性状的两两耦合关系中，有5对(A_area vs. G_s，A_mass vs. G_s，SLA vs. G_s，A_area vs. N_area，P_mass vs. N_mass)受到了生长时长的显著影响；(3)A_mass、N_mass和P_mass在各淹水强度之间无明显变化规律。无论在6月还是8月，158 m的A_area均大于未淹水的176 m；消落带的SLA显著小于未淹水对照带；N_area的大小依次为：158 m > 164 m > 176 m > 170 m；P_area均表现出消落带高于对照带。研究结果表明，在三峡水库消落带，年内生长时长差异会导致狗牙根的光合能力、比叶面积等多个性状发生显著变化，且对功能性状间的耦合关系影响显著；较少受到生长时长影响的稳定性状N_area和P_area可能更具群落与环境梯度之间关系的指示作用。
- 淹水强度 /
- 生长时长 /
- 功能性状 /
- 最大净光合速率 /
- 耦合关系 /
- SMA分析
Abstract: To study intra-annual variations in leaf traits of long-term submerged plants in the riparian zone of the Three Gorges Reservoir Area (TGA) during the dry period of the flood-dry-flood cycle, we investigated eight leaf functional traits (maximum net photosynthesis rate (A_area, A_mass), stomatal conductance (G_s), specific leaf area (SLA), leaf nitrogen concentration (N_area, N_mass), and leaf phosphorus concentration (P_area, P_mass)) of Cynodon dactylon ( L.) Pers. at four elevations (176, 170, 164, and 158 m) in June and August 2014. Results showed that: (1) Exposed period significantly contributed to variations in A_area, A_mass, G_s, SLA, and P_mass (more than 26% of total variation), similar to or even higher than submergence intensity. However, exposed days contributed little to variations in N_area, N_mass, and P_area (less than 15%). (2) Five bivariate relationships between leaf traits (A_area vs. G_s, A_mass vs. G_s, SLA vs. G_s, A_area vs. N_area, P_mass vs. N_mass) showed significant changes between two exposed periods. The intercept of A_mass vs. G_s changed significantly between June and August. (3) A_mass, N_mass, and P_mass showed no obvious trends in submergence intensity between June and August; A_area was significantly higher at 158 m than at 176 m regardless of month; SLA and P_area were significantly lower in the riparian zone (170, 164, and 158 m) than at 176 m; variation in N_area was in the order: 158 m > 164 m > 176 m > 170 m. These results suggest that annual exposed period can lead to significant variations in C. dactylon leaf traits, as well as the relationships between them. As N_area and P_area were stable traits (less affected by exposed days and submergence intensity), they may be candidate predictors for the structure and function of the TGA riparian ecosystem.
- Submergence intensity /
- Exposed days /
- Functional traits /
- Maximum net photosynthesis rate /
- Coupling relationship /
- Standard major axis

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