On the eastern Tibetan Plateau, the growth of trees is strongly affected by climate change. Previous researchers have found that climate warming changes thermal and hydraulic conditions, lengthening the growing season and promoting tree growth. Some studies have analyzed the effects of drought, precipitation, and temperature on tree growth. However, previous studies have mainly focused on natural forests, with few studies on the response of plantations to climate change. Therefore, we studied the relationship between dendrochronology (basal area increment, BAI), normalized difference vegetation index (NDVI), and climate factors to explore the response of Picea likiangensis var. rubescens plantations to climate change. The results showed that from 1990 to 2018, the temperature in the study area increased significantly; the rate of increase was 0.39^∘ per decade. Among the climate factors, self-calibrated Palmer drought severity index (scPDSI) had the most significant impact on BAI. From P_May (P_ represents the month of the previous year) to December, BAI was always negatively correlated with the scPDSI, with 9 months being significantly negatively correlated. BAI was significantly positively correlated with the minimum 2 m temperature (TMN) in P_July, P_September, July, and September. BAI was significantly positively correlated with the maximum 2 m temperature (TMX) in P_October, P_December, and July. BAI was significantly positively correlated with the mean 2 m temperature (TMP) in P_July, P_December, and July. There is a significant positive correlation between BAI and annual NDVI (NDVIa), which means that NDVI can be used to study the response of plantations to climate change. Our study contributes to a better understanding of the response of plantation growth in high-altitude areas to climate change, which is needed by forest managers.

中文翻译：

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生长季节延长，但水分供应量没有增加，而丽江云杉的生长增加。由于气候变化，青藏高原东部的冬凌草种植园

在青藏高原东部，树木的生长受到气候变化的强烈影响。以前的研究人员发现，气候变暖会改变热力和水力条件，延长生长季节并促进树木生长。一些研究分析了干旱、降水和温度对树木生长的影响。然而，以往的研究主要集中在天然林，很少有人研究人工林对气候变化的响应。因此，我们研究了树木年代学（基底面积增量，BAI）、归一化植被指数（NDVI）和气候因素之间的关系，以探索丽江云杉的响应。冬凌草种植园应对气候变化。结果表明，1990-2018年，研究区气温明显升高；增长率为 0.39 ^∘每十年。在气候因素中，自校准的帕尔默干旱严重程度指数（scPDSI）对 BAI 的影响最为显着。从P_May（P_代表上一年的月份）到12月，BAI始终与scPDSI呈负相关，其中9个月呈显着负相关。BAI 与 P_July、P_September、7 和 9 月的最低 2 m 温度 (TMN) 呈显着正相关。BAI 与 P_October、P_December 和 7 月的最高 2 m 温度 (TMX) 呈显着正相关。BAI 与 P_July、P_December 和 7 月的平均 2 m 温度 (TMP) 呈显着正相关。BAI与年度NDVI（NDVIa）呈显着正相关，这意味着NDVI可用于研究人工林对气候变化的响应。