| 摘要: |
| 为了探究气候变化背景下QTT（QiTai radio Telescope）台址长时间尺度的树木生长动态，明确树木生长的限制因素。本研究以天山山区优势树种雪岭云杉（Picea schrenkiana）为研究对象，运用VS（Vaganov-Shashkin model）模型对其树轮年表（1950-2022年）进行模拟，从而获取树木生长的限制性因素及其生长动态。研究结果表明：（1）树木生长呈现右偏单峰模式，且在生长旺盛期，水分是生长的主要限制因子；（2）过去73年间，生长季起始时间以1.5天每10年的速度提前，生长季结束时间没有显著变化，生长季长度以2.3天每10年速度延长；（3）树木生长与4-6月降水显著正相关，而与5-6月温度显著负相关。在气候变化背景下，水分限制将持续，随着生长季长度延长，水分限制的缓解将有效促进树木生长。研究结果将有助于台址区科学合理的开展森林经营管理，有效促进树木生长。 |
| 关键词: 树木年轮 VS模型 生长率 生长季 |
| DOI： |
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| 基金项目:国家自然基金项目（31901166） |
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| Response of model-based cambium phenology and climatic factors to radial growth in QiTai radio Telescope site |
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JIANGJing1, kangjian2, KANGJian1
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1.South China Botanical Garden, Chinese Academy of Sciences;2.XinjiangAstronomicalObservatory,ChineseAcademyofSciences
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| Abstract: |
| In order to investigate the dynamics of tree growth over long time scales at QTT (QiTai radio Telescope) sites in the context of climate change, and identify the limiting factors for tree growth. This study took Picea schrenkiana, the dominant tree species in the Tianshan Mountains, as the research object, and used VS model to simulate the tree ring chronology, so as to obtain the limiting factors of tree growth and its growth dynamics. The results showed that: (1) tree growth showed a right-sided single-peak pattern, and soil moisture was the main limiting factor for tree growth in the flourishing period. (2) During the past 73 years (1950-2022), the start time of the growing season increased by 1.5 days per decade, the end time of the growing season did not change significantly, and the length of the growing season increased by 2.3 days per decade. (3) There was a significant positive correlation between tree growth and precipitation from April to June, and a significant negative correlation between tree growth and temperature from May to June. In the context of climate change, soil moisture restriction will persist and the growing season will lengthen. As a result, alleviating water restriction will effectively promote tree growth. The results will be helpful to develop forest management scientifically and rationally and promote tree growth effectively. |
| Key words: tree ring VS model growth rate growing season |
