植物研究 ›› 2025, Vol. 45 ›› Issue (5): 686-694.doi: 10.7525/j.issn.1673-5102.2025.05.004

• 研究论文 • 上一篇    下一篇

兴安落叶松水分利用效率对模拟气候变暖的响应

王楠1, 王晶晶2, 王传宽2, 全先奎2()   

  1. 1.黑龙江科技大学建筑工程学院,哈尔滨 150020
    2.森林生态系统可持续经营教育部重点实验室(东北林业大学),哈尔滨 150040
  • 收稿日期:2025-03-28 出版日期:2025-09-20 发布日期:2025-09-28
  • 通讯作者: 全先奎 E-mail:quanxiankui@nefu.edu.cn
  • 作者简介:王楠(1982—),女,博士,讲师,主要从事森林生态学研究。
  • 基金资助:
    黑龙江科技大学基本科研业务费项目(2023-KYYWF-0536);黑龙江科技大学引进高层次人才科研启动基金项目(HKD202011)

Responses of Water Use Efficiency in Larix gmelinii to Simulated Climate Warming

Nan WANG1, Jingjing WANG2, Chuankuan WANG2, Xiankui QUAN2()   

  1. 1.College of Architectural Engineering,Heilongjiang University of Science and Technology,Harbin 150020
    2.Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education(Northeast Forestry University),Harbin 150040
  • Received:2025-03-28 Online:2025-09-20 Published:2025-09-28
  • Contact: Xiankui QUAN E-mail:quanxiankui@nefu.edu.cn

摘要:

研究气候变暖对树木水分利用效率的影响,有利于揭示树木碳水耦合关系对全球气候变暖的响应。2004年,将4个不同气温地点(年均温从低到高依次为塔河、松岭、孙吴、带岭)生长的兴安落叶松(Larix gmelinii)幼树移栽至其自然分布区南缘的同质园(帽儿山),通过被动增温模拟气候变暖。2022年8月,在同质园和4个移栽地同步采用气体交换法测定兴安落叶松瞬时水分利用效率(WUEi)和潜在水分利用效率(WUEg),并用碳同位素丰度表示长期水分利用效率(WUEL),探讨不同模拟变暖程度对兴安落叶松水分利用效率的影响。结果表明:WUEi和WUEg在不同模拟变暖程度下均显著增大,塔河、松岭、孙吴、带岭的WUEi分别增大33.37%、38.84%、42.06%和58.76%,WUEg分别增大15.94%、18.47%、20.84%和39.10%,WUEL仅在模拟变暖程度较大的松岭和塔河显著增大16.92%和30.56%。WUEi、WUEg和WUEL增大的幅度均与模拟变暖程度呈线性正相关。模拟气候变暖处理前后,WUEi和WUEg均存在显著的地点间差异且具有相似规律,而WUEL仅在模拟气候变暖处理前具有显著的地点间差异。WUEi对模拟气候变暖处理的响应最为敏感,而WUEL仅在模拟变暖程度较大时表现出差异性响应。综上,在研究气候变暖对树木水分利用效率影响时,既要考虑变暖的程度,也要考虑计算方法。

关键词: 气候变化, 碳水耦合, 水分利用效率, 兴安落叶松, 光合能力

Abstract:

Exploring the impact of climate warming on water use efficiency(WUE) of treesis significant for understanding the responses of tree carbon-water coupling to climate warming. In 2004, Larix gmelinii seedlings grown in four sites along temperate gradient(e.g., Tahe, Songling, Sunwu and Dailing) simulating climate warming were transplanted to a common garden(Mao’ershan) near the natural edge of this species’ range. In August 2022, in the common garden and four different transplanting sites, the instantaneous water use efficiency(WUEi) and intrinsic water use efficiency(WUEg) were measured using the gas exchange method, and long-term water use efficiency(WUEL) was calculated via carbon-13 isotope abundance to explore the effects of different simulating climate warming magnitudes on WUE of L. gmelinii. The results showed that both WUEi and WUEg significantly increased, with an increase of 33.37%, 38.84%, 42.06% and 58.76% for WUEi, and an increase of 15.94%, 18.47%, 20.84% and 39.10% for WUEg of L. gmelinii under the simulated climate warming by transplantation from the sites Tahe, Songling, Sunwu and Dailing, respectively. The WUEL significantly increased by 16.92% and 30.56% for Songling and Tahe, respectively. The increasing rate of WUEi, WUEg and WUEL showed positive linear correlations with the warming magnitude. Both WUEi and WUEg showed significant and similar site differences in the common garden and among the transplanting sites, while WUEL showed significant differences only among the transplanting sites. WUEi was sensitive to all the warming magnitudes, but WUEL was sensitive only to the high warming magnitude. Therefore, the warming magnitude and the determining methods should be taken into consideration in tree WUE responses to climate warming.

Key words: climate change, carbon-water coupling, water use efficiency, Larix gmelinii, photosynthetic capacity

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