A joint research team led by researchers from the Xinjiang Institute of Ecology and Geography (XIEG) and the Research Center for Eco-Environmental Sciences (RCEES) of the Chinese Academy of Sciences reconstructed the historical non-growing-season (from November of the previous year to February of the current year) precipitation in the southeastern Tibetan Plateau using tree rings.
The study was published in Climate of the Past.
The Tibetan Plateau plays a key role in regional and global atmospheric circulation patterns influencing the climate of southwest China as well as whole Asia due to its geographical extent and position within the global circulation system.
However, there are few reports about the historical precipitation reconstruction in this region, restricting our evaluation on the current trend of precipitation variation from long term perspective and its impact on the regional ecosystem.
In this study, the researchers collected tree-ring samples from Tsuga forrestii trees at high altitudes of Lijiang region in the southeastern Tibetan Plateau and established residual tree-ring chronology. They then reconstructed the non-growing-season precipitation history according to the results of tree growth and climate relationship analysis.
The results showed that the non-growing-season precipitation was the most important constraining factor on the radial growth of Tsuga forrestii, and the relationship between non-growing-season precipitation and radial tree growth was relatively stable over time.
The reconstructed precipitation series explained 28.5% of the variability in actual non-growing-season precipitation and showed similarities with existing reconstructions of hydroclimatic factors.
The reconstruction had a large area of spatial representativeness in the southeastern Tibetan Plateau, and in recent years, the non-growing-season precipitation showed increasing trend implying that it would benefit the development of regional forest ecosystem.
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