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Differential Trends of Qinghai Spruce Growth with Elevation in Northwestern China during the Recent Warming Hiatus
Wang, Bin; Yu, Pengtao; Zhang, Lei1,2; Wang, Yanhui; Yu, Yipeng; Wang, Shunli3
2019-09-01
Source PublicationFORESTS
Volume10Issue:9Pages:-
AbstractTree growth strongly responds to climate change, especially in semiarid mountainous areas. In recent decades, China has experienced dramatic climate warming; however, after 2000 the warming trend substantially slowed (indicative of a warming hiatus) in the semiarid areas of China. The responses of tree growth in respect to elevation during this warming hiatus are poorly understood. Here, we present the responses of Qinghai spruce (Picea crassifolia Kom.) growth to warming using a stand-total sampling strategy along an elevational gradient spanning seven plots in the Qilian Mountains. The results indicate that tree growth experienced a decreasing trend from 1980 to 2000 at all elevations, and the decreasing trend slowed with increasing elevation (i.e., a downward trend from -10.73 mm(2) year(-1) of the basal area increment (BAI) at 2800 m to -3.48 mm(2) year(-1) of BAI at 3300 m), with an overall standard deviation (STD) of 2.48 mm(2) year(-1). However, this trend reversed to an increasing trend after 2000, and the increasing trends at the low (2550-2900 m, 0.27-5.07 mm(2) year(-1) of BAI, p > 0.23) and middle (3000-3180 m, 2.08-2.46 mm(2) year(-1) of BAI, p > 0.2) elevations were much weaker than at high elevations (3300 m, 23.56 mm(2) year(-1) of BAI, p < 0.01). From 2000-2013, the difference in tree growth with elevation was much greater than in other sub-periods, with an overall STD of 7.69 mm(2) year(-1). The stronger drought conditions caused by dramatic climate warming dominated the decreased tree growth during 1980-2000, and the water deficit in the 2550-3180 m range was stronger than at 3300 m, which explained the serious negative trend in tree growth at low and middle elevations. After 2000, the warming hiatus was accompanied by increases in precipitation, which formed a wetting-warming climate. Although moisture availability was still a dominant limiting factor of tree growth, the relieved drought pressure might be the main reason for the recent recovery in the tree growth at middle and low elevations. Moreover, the increasing temperature significantly promoted tree growth at 3300 m, with a correlation coefficient between the temperature and BAI of 0.77 (p < 0.01). Our results implied that climate change drove different growth patterns at different elevations, which sheds light into forest management under the estimated future climate warming: those trees in low and middle elevations should be paid more attention with respect to maintaining tree growth, while high elevations could be a more suitable habitat for this species.
Department城市与区域生态国家重点实验室
KeywordQinghai spruce warming hiatus elevation gradient tree growth growth-climate relationships
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42395
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Key Lab Forest Ecol & Environm State Forestry Adm, Beijing 100091, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Acad Water Resource Conservat Forests Qilian Moun, Zhangye 734000, Peoples R China
Recommended Citation
GB/T 7714
Wang, Bin,Yu, Pengtao,Zhang, Lei,et al. Differential Trends of Qinghai Spruce Growth with Elevation in Northwestern China during the Recent Warming Hiatus[J]. FORESTS,2019,10(9):-.
APA Wang, Bin,Yu, Pengtao,Zhang, Lei,Wang, Yanhui,Yu, Yipeng,&Wang, Shunli.(2019).Differential Trends of Qinghai Spruce Growth with Elevation in Northwestern China during the Recent Warming Hiatus.FORESTS,10(9),-.
MLA Wang, Bin,et al."Differential Trends of Qinghai Spruce Growth with Elevation in Northwestern China during the Recent Warming Hiatus".FORESTS 10.9(2019):-.
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