气候变化领域集成服务门户(CCPortal): Greater risk of hydraulic failure due to increased drought threatens pine plantations in Horqin Sandy Land of northern China

CCPortal

DOI	10.1016/j.foreco.2020.117980
	Greater risk of hydraulic failure due to increased drought threatens pine plantations in Horqin Sandy Land of northern China
	Li M.-Y.; Fang L.-D.; Duan C.-Y.; Cao Y.; Yin H.; Ning Q.-R.; Hao G.-Y.
发表日期	2020
ISSN	0378-1127
卷号	461
英文摘要	Widespread decline and mortality of shelterbelt forests in water-limited regions of northern China have been occurring over the past few decades and may become more severe under the influence of climate change; however, our understanding on how droughts affect tree performance in a long-term context and the underlying water-related physiological mechanisms are still limited. Here, using a combination of tree-ring analysis and measurement of water-related functional traits, we investigated patterns of long-term radial growth and the underlying physiology in Pinus sylvestris var. mongolica (Mongolian Pine) and Pinus tabuliformis (Chinese Pine) in relation to variation in environmental water availability in Horqin Sandy Land (HSL), i.e. a key area of land desertification control in northern China where the two species are commonly used for afforestation. Particularly, we studied the association between tree-ring growth responses to drought and xylem hydraulics of the two species at the two sites of HSL that differ in climate regimes, examining the potential impacts of climate warming-related aridification on tree performances using a space-for-time substitution approach. Tree-ring analyses revealed greater degrees of recent growth decline, lower resilience to drought, and more severe tree hydraulic limitations in both pine species at the semiarid site compared to the semi-humid site. Tree-ring width indices of both species in the drier site showed significant positive correlations with May-July total precipitation of the current year and negative correlations with mean temperature of the same period, whereas such correlations were not significant at the wetter site. Lower stem hydraulic conductivity and higher degrees of xylem embolism in the drier site suggest that both pine species suffer from stronger hydraulic limitation when the environment gets drier. Moreover, Mongolian pine with a significantly higher hydraulic conductivity consistently showed higher basal area increments than Chinese pine at both sites. Our results suggest that Mongolian pine, the currently most widely used trees to create shelterbelt plantations in desertified areas of northern China, is more susceptible to decline than Chinese pine as the climate becomes hotter and drier, although the former species has a higher growth rate than the latter one. Our investigation provides a mechanistic explanation for the commonly observed decline and dieback of pine trees in water-limited environments of northern China and suggests that Chinese pine may be a better choice to replace Mongolian pine as the main tree species in plantations of the study area with a changed climate regime in the future. © 2020 Elsevier B.V.
关键词	Driers (materials)Drought Failure (mechanical)Hydraulic conductivity Physiology Reforestation Climate warming Hydraulic architecture Hydraulic limitations Physiological mechanisms Positive correlations Tree decline Tree rings Tree-ring-width indices Climate change aridification basal area coniferous tree desertification dieback forestry production hydraulic conductivity mortality plantation forestry population decline shelterbelt tree ring China Driers Drought Physiology Pinus Reforestation Trees Water China Horqin Desert Pinus sylvestris Pinus tabuliformis
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132951
推荐引用方式 GB/T 7714	Li M.-Y.,Fang L.-D.,Duan C.-Y.,et al. Greater risk of hydraulic failure due to increased drought threatens pine plantations in Horqin Sandy Land of northern China[J]. Forest Ecology and Management,2020,461.
APA	Li M.-Y..,Fang L.-D..,Duan C.-Y..,Cao Y..,Yin H..,...&Hao G.-Y..(2020).Greater risk of hydraulic failure due to increased drought threatens pine plantations in Horqin Sandy Land of northern China.,461.
MLA	Li M.-Y.,et al."Greater risk of hydraulic failure due to increased drought threatens pine plantations in Horqin Sandy Land of northern China".461(2020).