We established a five-century long tree-ring chronology partitioned between earlywood and latewood growth to examine intra-annual climate response and attempt to establish linkages to agricultural production. Longleaf pine earlywood and latewood width chronologies spanned the period 1491–2017 (527 years) and constitute one of the longest records achieved for this species. High monthly correlations were found between latewood growth and summer-fall Palmer Drought Z-Index. Correlations were consistently significantly positive for June through October. Intra-annual growth of earlywood and latewood were positively correlated for the full period of record, but exhibited variability in correlation strength through time. Conversely, earlywood and prior-year latewood were also frequently correlated, but correlations were found to switch between positive and negative association, possibly in response to Atlantic Ocean temperatures. Annual yields of major crops are coupled with latewood growth, representing a new and potentially valuable proxy for linking agricultural yields to climate proxies over multiple centuries.

我们建立了一个五世纪的长树年轮年代表，将其分为早材和晚材生长，以检查年内气候响应并尝试建立与农业生产的联系。长叶松早木和晚木的宽度年代跨度为1491-2017年（527年），是该树种最长的记录之一。发现晚材生长与夏秋季的Palmer Drought Z指数之间存在较高的月相关性。从6月到10月，相关性始终是显着正的。在整个记录期间，早材和晚材的年内生长呈正相关，但在相关强度上随时间变化。相反，早材和上年晚材也经常相关，但是发现相关性会在正向和负向关联之间切换，这可能是由于大西洋的温度所致。主要农作物的年产量与晚材的生长相结合，代表了将农业产量与多个世纪以来的气候代理联系起来的一种新的且具有潜在价值的代理。