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We utilised tree-ring cores, collected from three sites at Lingkong Mountainlocated in the southeast part of the Chinese Loess Plateau (CLP), to developea regional ring-width chronology. Significant positive correlations betweenthe tree-ring index and the monthly Palmer drought severity index (PDSI)were identified, indicating that the radial growth of trees in this regionwas moisture-limited. The March–August mean PDSI was quantitativelyreconstructed from 1703 to 2008 with an explained variance of 46.4%.Seven dry periods during 1719–1726, 1742–1748, 1771–1778, 1807–1818,1832–1848, 1867–1932 and 1993–2008 and six wet periods during 1727–1741,1751–1757, 1779–1787, 1797–1805, 1853–1864 and 1934–1957 were revealedin our reconstruction. Among them, 1867–1932 and 1934–1957 were identifiedas the longest dry and wet periods, respectively. On the centennial scale,the 19th century was recognised as the driest century. The drying tendencysince 1960s was evident. However, recent drought in 1993–2008 was stillwithin the frame of natural climate variability based on the 306 yr PDSIreconstruction. The dry and wet phases of Lingkong Mountain were inaccordance with changes in the summer Asian-Pacific oscillation (<i>I</i><sub>APO</sub>)and sunspot numbers, they also showed strong similarity to other tree-ringbased moisture indexes in large areas in and around the CLP, indicating themoisture variability in the CLP was almost synchronous and closely relatedwith large-scale land–ocean–atmospheric circulation and solar activity.Spatial correlation analysis suggested that this PDSI reconstruction couldrepresent the moisture variations for most parts of the CLP, and even largerarea of northern China and east Mongolia. Multi-taper spectral analysisrevealed significant cycles at the inter-annual (2–7 yr), inter-decadal(37.9 yr) and centennial (102 yr) scales. Results of this study are veryhelpful for us to improve the knowledge of past climate change in the CLPand enable us to prevent and manage future natural disasters

climate of the past

Reconstruction of the March–August PDSI since 1703 AD based on tree rings of Chinese pine (&amp;lt;i&amp;gt;Pinus tabulaeformis&amp;lt;/i&amp;gt; Carr.) in the Lingkong Mountain, southeast Chinese loess Plateau