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A Standardized Precipitation Evapotranspiration Index Reconstruction in the Taihe Mountains Using Tree-Ring Widths for the Last 283 Years.

Ma Y, Liu Y, Song H, Sun J, Lei Y, Wang Y - PLoS ONE (2015)

Bottom Line: Our SPEI reconstruction revealed long-term patterns of drought variability and captured some significant drought events, including the severe drought of 1928-1930 and the clear drying trend since the 1950s which were widespread across northern China.The time-dependency of the growth response to drought should be considered in further studies of the community dynamics.The SPEI reconstruction improves the sparse network of long-term climate records for an enhanced understanding of climatic variability on the western Loess Plateau, China.

View Article: PubMed Central - PubMed

Affiliation: The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; The University of the Chinese Academy of Science, Beijing, 100049, China.

ABSTRACT
Tree-ring samples from Chinese Pine (Pinus tabulaeformis Carr.) that were collected in the Taihe Mountains on the western Loess Plateau, China, were used to analyze the effects of climate and drought on radial growth and to reconstruct the mean April-June Standardized Precipitation Evapotranspiration Index (SPEI) during the period 1730-2012 AD. Precipitation positively affected tree growth primarily during wet seasons, while temperature negatively affected tree growth during dry seasons. Tree growth responded positively to SPEI at long time scales most likely because the trees were able to withstand water deficits but lacked a rapid response to drought. The 10-month scale SPEI was chosen for further drought reconstruction. A calibration model for the period 1951-2011 explained 51% of the variance in the modeled SPEI data. Our SPEI reconstruction revealed long-term patterns of drought variability and captured some significant drought events, including the severe drought of 1928-1930 and the clear drying trend since the 1950s which were widespread across northern China. The reconstruction was also consistent with two other reconstructions on the western Loess Plateau at both interannual and decadal scales. The reconstructed SPEI series showed synchronous variations with the drought/wetness indices and spatial correlation analyses indicated that this reconstruction could be representative of large-scale SPEI variability in northern China. Period analysis discovered 128-year, 25-year, 2.62-year, 2.36-year, and 2.04-year cycles in this reconstruction. The time-dependency of the growth response to drought should be considered in further studies of the community dynamics. The SPEI reconstruction improves the sparse network of long-term climate records for an enhanced understanding of climatic variability on the western Loess Plateau, China.

No MeSH data available.


Correlations between the tree-ring STD chronology and monthly mean temperature, and monthly total precipitation (1957–2012 AD).Horizontal dashed lines represent the 95% C.L.
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pone.0133605.g004: Correlations between the tree-ring STD chronology and monthly mean temperature, and monthly total precipitation (1957–2012 AD).Horizontal dashed lines represent the 95% C.L.

Mentions: As shown in Fig 4, significantly positive correlations (at the 95% confidence level (C.L.)) were found between the STD chronology and precipitation during August and September of the previous year and during April of the current year. Significantly negative correlations were found between the STD chronology and temperature during September of the previous year and during January, February, March and May of the current year. The strongest growth responses to precipitation were observed for those months included primarily within the wet season in summer, while the strongest growth responses to temperature occurred primarily in winter and spring when high temperature would enhance evaporation and further reduce available water at the beginning of the growing season. After seasonal combinations, the strongest response of growth indices to precipitation was found from August of the previous year and May of the current year (r = 0.566). Additionally, the strongest response of growth indices to temperature was found from January of the current year to May of the current year (r = -0.524), suggesting that both precipitation and temperature strongly correlated with tree growth. In general, the overall climate-growth response negatively correlates with temperature and positively correlates with precipitation, revealing the moisture-stressed growth pattern in the study region [3]. This moisture-stressed growth pattern is also found in other dendroclimatic studies on the Loess Plateau [9, 10, 32].


A Standardized Precipitation Evapotranspiration Index Reconstruction in the Taihe Mountains Using Tree-Ring Widths for the Last 283 Years.

Ma Y, Liu Y, Song H, Sun J, Lei Y, Wang Y - PLoS ONE (2015)

Correlations between the tree-ring STD chronology and monthly mean temperature, and monthly total precipitation (1957–2012 AD).Horizontal dashed lines represent the 95% C.L.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4514737&req=5

pone.0133605.g004: Correlations between the tree-ring STD chronology and monthly mean temperature, and monthly total precipitation (1957–2012 AD).Horizontal dashed lines represent the 95% C.L.
Mentions: As shown in Fig 4, significantly positive correlations (at the 95% confidence level (C.L.)) were found between the STD chronology and precipitation during August and September of the previous year and during April of the current year. Significantly negative correlations were found between the STD chronology and temperature during September of the previous year and during January, February, March and May of the current year. The strongest growth responses to precipitation were observed for those months included primarily within the wet season in summer, while the strongest growth responses to temperature occurred primarily in winter and spring when high temperature would enhance evaporation and further reduce available water at the beginning of the growing season. After seasonal combinations, the strongest response of growth indices to precipitation was found from August of the previous year and May of the current year (r = 0.566). Additionally, the strongest response of growth indices to temperature was found from January of the current year to May of the current year (r = -0.524), suggesting that both precipitation and temperature strongly correlated with tree growth. In general, the overall climate-growth response negatively correlates with temperature and positively correlates with precipitation, revealing the moisture-stressed growth pattern in the study region [3]. This moisture-stressed growth pattern is also found in other dendroclimatic studies on the Loess Plateau [9, 10, 32].

Bottom Line: Our SPEI reconstruction revealed long-term patterns of drought variability and captured some significant drought events, including the severe drought of 1928-1930 and the clear drying trend since the 1950s which were widespread across northern China.The time-dependency of the growth response to drought should be considered in further studies of the community dynamics.The SPEI reconstruction improves the sparse network of long-term climate records for an enhanced understanding of climatic variability on the western Loess Plateau, China.

View Article: PubMed Central - PubMed

Affiliation: The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; The University of the Chinese Academy of Science, Beijing, 100049, China.

ABSTRACT
Tree-ring samples from Chinese Pine (Pinus tabulaeformis Carr.) that were collected in the Taihe Mountains on the western Loess Plateau, China, were used to analyze the effects of climate and drought on radial growth and to reconstruct the mean April-June Standardized Precipitation Evapotranspiration Index (SPEI) during the period 1730-2012 AD. Precipitation positively affected tree growth primarily during wet seasons, while temperature negatively affected tree growth during dry seasons. Tree growth responded positively to SPEI at long time scales most likely because the trees were able to withstand water deficits but lacked a rapid response to drought. The 10-month scale SPEI was chosen for further drought reconstruction. A calibration model for the period 1951-2011 explained 51% of the variance in the modeled SPEI data. Our SPEI reconstruction revealed long-term patterns of drought variability and captured some significant drought events, including the severe drought of 1928-1930 and the clear drying trend since the 1950s which were widespread across northern China. The reconstruction was also consistent with two other reconstructions on the western Loess Plateau at both interannual and decadal scales. The reconstructed SPEI series showed synchronous variations with the drought/wetness indices and spatial correlation analyses indicated that this reconstruction could be representative of large-scale SPEI variability in northern China. Period analysis discovered 128-year, 25-year, 2.62-year, 2.36-year, and 2.04-year cycles in this reconstruction. The time-dependency of the growth response to drought should be considered in further studies of the community dynamics. The SPEI reconstruction improves the sparse network of long-term climate records for an enhanced understanding of climatic variability on the western Loess Plateau, China.

No MeSH data available.