Dendrochronological Scots pine standard (1110 - 1460 ad) for North-Eastern Poland

The study presents preliminary results of investigations on construction of the regional dendrochronological standard for Scots pine (Pinus sylvestris L.) for NE Poland. The produced standard 2NPINA is 351 years long, spanning the period 1110-1460 AD. It is based on three local chronologies established from wood samples from Gdańsk (2GDAA1A; 1116 . 1460 AD), Ostróda (2OST1B; 1251 . 1411 AD), and Pułtusk (2PUAA1A; 1110 . 1408 AD). The chronologies presented display relatively high mutual similarities. The highest similarity was noted for the Gdańsk and Ostróda chronologies (t=6.36), somewhat lower for the Pułtusk and Ostróda (t=5.0), and the lowest one for the Pułtusk and Gdańsk patterns (t=4.67). Construction of the standard 2NPINA is the first step in establishing a several-hundred-year pine chronology for this region, hitherto beyond the extent of dendrochronological signal, which rendered unsuccessful any attempt of dating historical wood of pine.