Effects of thinning and understory removal on water use efficiency of Pinus massoniana: evidence from photosynthetic capacity and stable carbon isotope analyses

IF 3.4 2区 农林科学 Q1 FORESTRY Journal of Forestry Research Pub Date : 2024-02-07 DOI:10.1007/s11676-023-01666-7
Ting Wang, Qing Xu, Beibei Zhang, Deqiang Gao, Ying Zhang, Jing Jiang, Haijun Zuo
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Abstract

Understanding the relationship between forest management and water use efficiency (WUE) is important for evaluating forest adaptability to climate change. However, the effects of thinning and understory removal on WUE and its key controlling processes are not well understood, which limits our comprehension of the physiological mechanisms of various management practices. In this study, four forest management measures (no thinning: NT; understory removal: UR; light thinning: LT; and heavy thinning: HT) were carried out in Pinus massoniana plantations in a subtropical region of China. Photosynthetic capacity and needle stable carbon isotope composition (δ13C) were measured to assess instantaneous water use efficiency (WUEinst) and long-term water use efficiency (WUEi). Multiple regression models and structural equation modelling (SEM) identified the effects of soil properties and physiological performances on WUEinst and WUEi. The results show that WUEinst values among the four treatments were insignificant. However, compared with the NT stand (35.8 μmol·mol−1), WUEi values significantly increased to 41.7 μmol·mol−1 in the UR, 50.1 μmol·mol−1 in the LT and 46.6 μmol·mol−1 in HT treatments, largely explained by photosynthetic capacity and soil water content. Understory removal did not change physiological performance (needle water potential and photosynthetic capacity). Thinning increased the net photosynthetic rate (An) but not stomatal conductance (gs) or predawn needle water potential (ψpd), implying that the improvement in water use efficiency for thinned stands was largely driven by radiation interception than by soil water availability. In general, thinning may be an appropriate management measure to promote P. massoniana WUE to cope with seasonal droughts under future extreme climates.

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疏伐和移除林下植物对马尾松水分利用效率的影响:光合能力和稳定碳同位素分析的证据
了解森林管理与水分利用效率(WUE)之间的关系对于评估森林对气候变化的适应性非常重要。然而,人们对疏伐和林下植物移除对水分利用效率及其关键控制过程的影响还不甚了解,这限制了我们对各种管理措施的生理机制的理解。在本研究中,四种森林管理措施(不疏伐:NT;清除林下植被:NTNT;清除林下植被:UR;轻度疏伐LT;以及重度疏伐:HT)。测量了光合能力和针叶稳定碳同位素组成(δ13C),以评估瞬时水分利用效率(WUEinst)和长期水分利用效率(WUEi)。多元回归模型和结构方程建模(SEM)确定了土壤特性和生理表现对 WUEinst 和 WUEi 的影响。结果表明,四种处理的 WUEinst 值不显著。然而,与新植株(35.8 μmol-mol-1)相比,UR、LT 和 HT 处理的 WUEi 值分别显著增加到 41.7 μmol-mol-1、50.1 μmol-mol-1和 46.6 μmol-mol-1,这主要是由光合能力和土壤含水量造成的。移除下层植物并没有改变生理性能(针叶水势和光合能力)。疏伐提高了净光合速率(An),但没有提高气孔导度(gs)或黎明前针叶水势(ψpd),这意味着疏伐林分水分利用效率的提高主要是由辐射拦截而非土壤水分供应驱动的。总之,在未来极端气候条件下,疏伐可能是提高P. massoniana水分利用效率以应对季节性干旱的适当管理措施。
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来源期刊
CiteScore
7.30
自引率
3.30%
发文量
2538
期刊介绍: The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects: Basic Science of Forestry, Forest biometrics, Forest soils, Forest hydrology, Tree physiology, Forest biomass, carbon, and bioenergy, Forest biotechnology and molecular biology, Forest Ecology, Forest ecology, Forest ecological services, Restoration ecology, Forest adaptation to climate change, Wildlife ecology and management, Silviculture and Forest Management, Forest genetics and tree breeding, Silviculture, Forest RS, GIS, and modeling, Forest management, Forest Protection, Forest entomology and pathology, Forest fire, Forest resources conservation, Forest health monitoring and assessment, Wood Science and Technology, Wood Science and Technology.
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