Tree-ring reconstruction of summer temperature for A.D. 1475–2003 in the central Hengduan Mountains, Northwestern Yunnan, China

Li, Zongshan; Zhang, Qi-Bin; Ma, Keping

doi:10.1007/s10584-011-0111-z

Cited by 83 publications

(72 citation statements)

References 58 publications

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“…1) is in accord with global trends (1) and with other studies focused on this area of the eastern Himalaya (20,21,34,35). The lack of significant directional change in Rhododendron flowering time over this warming period might initially suggest that the genus is nonresponsive to temperature.…”

Section: Discussionsupporting

confidence: 87%

Herbarium specimens show contrasting phenological responses to Himalayan climate

Hart

Salick

Ranjitkar

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

133

125

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Responses by flowering plants to climate change are complex and only beginning to be understood. Through analyses of 10,295 herbarium specimens of Himalayan Rhododendron collected by plant hunters and botanists since 1884, we were able to separate these responses into significant components. We found a lack of directional change in mean flowering time over the past 45 y of rapid warming. However, over the full 125 y of collections, mean flowering time shows a significant response to year-to-year changes in temperature, and this response varies with season of warming. Mean flowering advances with annual warming (2.27 d earlier per 1°C warming), and also is delayed with fall warming (2.54 d later per 1°C warming). Annual warming may advance flowering through positive effects on overwintering bud formation, whereas fall warming may delay flowering through an impact on chilling requirements. The lack of a directional response suggests that contrasting phenological responses to temperature changes may obscure temperature sensitivity in plants. By drawing on large collections from multiple herbaria, made over more than a century, we show how these data may inform studies even of remote localities, and we highlight the increasing value of these and other natural history collections in understanding longterm change.phenology | global warming I n an era of ongoing climate change (1), shifts in seasonal timing of life history events (phenology) are among the first and the most important responses seen in biological systems (2-5). Changes in phenology potentially impact organism reproduction, population survival, species boundaries, and ecosystem service (6-8). However, despite the importance of phenological changes (9, 10), data sources are limited (11). Satellite imagery (12), experimental studies (13), and modern observational records of phenology (11,14) are temporally restricted to the last few decades. Although historical phenological records kept by scientists, amateur naturalists, or for cultural reasons (15-17) may extend much further, these are often limited in geographic range, and tend to focus on North America and Europe (but see ref. 18).Such records have not been found for the Himalayan region, an area of particular concern when considering climate change. Rapid temperature increases and changes in precipitation, in combination with the importance of Himalayan snowpack and glaciers to water supply and monsoon cycles, make the region one of the most threatened nonpolar areas of the world (1,19). Recent climate change is impacting Himalayan biological systems, including those upon which humans rely (20-23).Despite its remoteness, the botanical richness of Yulong Mountain (27°N, 100.2°E), at the eastern limit of the Himalayan region, has made it a center of botanical collection since the late 19th century. Yulong Mountain was home to the prolific plant hunters George Forrest (collecting 1904-1930) and Joseph Rock (collecting 1918-1948). Other early collectors in the area included Jean Marie Delavayi, Heinrich ...

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Section: Discussionsupporting

confidence: 87%

Herbarium specimens show contrasting phenological responses to Himalayan climate

Hart

Salick

Ranjitkar

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

133

125

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“…The entire series showed detectable power within the ENSO range of variability [47], a span of 4 to 8 years, although this component of the power spectrum was relatively weak. The close relationships between the PDO and ENSO and Asian climatic conditions have been confirmed by many previous tree-ring studies [49,50].…”

Section: Regional Comparison and Teleconnectionssupporting

confidence: 73%

A tree-ring-based reconstruction of the Yimin River annual runoff in the Hulun Buir region, Inner Mongolia, for the past 135 years

Bao

Liu

2012

Chin. Sci. Bull.

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Based on the relationships between the regional tree-ring chronology (RC) of moisture-sensitive Pinus sylvestris var. mongolica and the monthly mean maximum temperature, annual precipitation and annual runoff, a reconstruction of the runoff of the Yimin River was performed for the period 1868-2002. The model was stable and could explain 52.2% of the variance for the calibration period of . During the past 135 years, 21 extremely dry years and 19 extremely wet years occurred. These years represented 15.6% and 14.1% of the total study period, respectively. Six severe drought events lasting two years or more occurred in

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“…Instrumental records and the reconstructed precipitation both show a trend of increasing moisture since 1983, and this trend is likely to be related to the strong stage of the South Asia monsoon [33]; the 79-85 cycle maybe related with solar activity [34,35]. Also, many other reconstructions nearby based on tree rings revealed similar cycles [11,13]. a similar trend and variation, and the region became wetter in the last 20 years.…”

Section: Spectral Analysismentioning

confidence: 86%

“…Most of the samples were collected from high elevation (>3400 m) [6][7][8][9][10][11], and with the rich precipitation in this area, most of these studies had reconstructed temperature variation. Only a few of them were related to variations in precipitation or the Palmer Drought Severity Index (PDSI) [12,13] and their samples were usually collected from lower altitudes (<3240 m).…”

mentioning

confidence: 99%

A 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau, China using tree-ring records

et al. 2013

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This paper presents a 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau using tree-ring records. Tree-ring samples were collected from the Hengduan Mountains in the southeastern part of the Qinghai-Tibet Plateau, China. A nearly 500-year chronology was developed using tree-ring width records. Correlation analysis shows moisture is the main factor limiting tree growth in this region. Ring-widths were significantly positively correlated with the Palmer Drought Severity Index (PDSI) and precipitation in many months. The highest correlation coefficient was found between the annual growth of trees and precipitation from the previous September to the current June (0.738). Based on this relationship, we reconstructed the precipitation history from 1509 to 2006. The reconstruction explains 54.4% (R 2 adj =53.5%, N=49, F=56.12) of the actual precipitation variation during the calibration period . During the reliable period of the reconstruction (1549-2006), some low-frequency climate signals are included, indicating this region has been getting wetter in the last 20 years. The reconstruction documents six apparently dry and five pluvial periods and the 17th century dry period lasted longer than any other. When compared with other recent studies, this study and these earlier reconstructions show a similar trend in the variation of drought and pluvial. Further spatial correlation analysis confirms that the reconstructed precipitation adequately represents the rainfall history of the entire Hengduan Mountain area. The Multi-taper method, a type of spectral analysis, reveals that precipitation in this area had significant (P<0.01) spectral peaks at 3-5 a, 60 a and 79-85 a.Abies Mill., Hengduan Mountains, precipitation reconstruction, Qinghai-Tibet Plateau, tree-ring width Citation:Gou X H, Yang T, Gao L L, et al. A 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau, China using tree-ring records.

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Tree-ring reconstruction of summer temperature for A.D. 1475–2003 in the central Hengduan Mountains, Northwestern Yunnan, China

Cited by 83 publications

References 58 publications

Herbarium specimens show contrasting phenological responses to Himalayan climate

Herbarium specimens show contrasting phenological responses to Himalayan climate

A tree-ring-based reconstruction of the Yimin River annual runoff in the Hulun Buir region, Inner Mongolia, for the past 135 years

A 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau, China using tree-ring records

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