Aging Mongolian pine plantations face high risks of drought-induced growth decline: evidence from both individual tree and forest stand measurements

IF 3.4 2区 农林科学 Q1 FORESTRY
Mingyong Li, Leilei Yang, Yu Cao, Dedong Wu, Guangyou Hao
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Abstract

Discerning vulnerability differences among different aged trees to drought-driven growth decline or to mortality is critical to implement age-specific countermeasures for forest management in water-limited areas. An important species for afforestation in dry environments of northern China, Mongolian pine (Pinus sylvestris var. mongolica Litv.) has recently exhibited growth decline and dieback on many sites, particularly pronounced in old-growth plantations. However, changes in response to drought stress by this species with age as well as the underlying mechanisms are poorly understood. In this study, tree-ring data and remotely sensed vegetation data were combined to investigate variations in growth at individual tree and stand scales for young (9 − 13 years) and aging (35 − 52 years) plantations of Mongolian pine in a water-limited area of northern China. A recent decline in tree-ring width in the older plantation also had lower values in satellited-derived normalized difference vegetation indices and normalized difference water indices relative to the younger plantations. In addition, all measured growth-related metrics were strongly correlated with the self-calibrating Palmer drought severity index during the growing season in the older plantation. Sensitivity of growth to drought of the older plantation might be attributed to more severe hydraulic limitations, as reflected by their lower sapwood- and leaf-specific hydraulic conductivities. Our study presents a comprehensive view on changes of growth with age by integrating multiple methods and provides an explanation from the perspective of plant hydraulics for growth decline with age. The results indicate that old-growth Mongolian pine plantations in water-limited environments may face increased growth declines under the context of climate warming and drying.

Abstract Image

老化的蒙古松人工林面临干旱引起的生长衰退的高风险:单株树木和林分测量的证据
鉴别不同树龄的树木对干旱导致的生长衰退或死亡的脆弱性差异,对于在水资源有限地区实施针对不同树龄的森林管理对策至关重要。作为中国北方干旱环境造林的重要树种,蒙古松(Pinus sylvestris var.然而,人们对该树种随着年龄增长对干旱胁迫的响应变化及其内在机制还知之甚少。本研究结合树环数据和遥感植被数据,研究了中国北方限水地区年轻(9 - 13 年)和衰老(35 - 52 年)的蒙古松人工林在单棵树和林分尺度上的生长变化。与较年轻的人工林相比,较年长人工林的树环宽度最近有所下降,卫星衍生的归一化差异植被指数和归一化差异水分指数值也较低。此外,在老植被的生长季节,所有测量的生长相关指标都与自校准帕尔默干旱严重程度指数密切相关。老植株的生长对干旱的敏感性可能归因于更严重的水力限制,这反映在其较低的边材和叶片特异性水力传导率上。我们的研究综合了多种方法,对生长随树龄的变化提出了全面的看法,并从植物水力学的角度解释了生长随树龄下降的原因。研究结果表明,在气候变暖和干燥的背景下,限水环境中的老龄蒙古松人工林可能会面临更严重的生长衰退。
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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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