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利用黄泛区沙丘上散生的黄连木树轮宽度进行生态学研究,以便揭示研究区黄连木的径向生长与气候因子之间的关系.建立的树轮差值年表中有较高的平均敏感度、信噪比和样本总体解释量,表明年表中含有较多的高频气候变化信息.年表序列与气候因子(月平均气温、月平均最高气温、月平均最低气温、月降水量和帕尔默干旱指数(PDSI))的相关结果表明:树轮宽度与前一年7月月平均气温和月平均最高气温以及当年6月月平均最高气温都呈显著负相关,而与前一年9月月平均最低气温和前一年12月、当年2月及6月降水量呈显著正相关,尤其与前一年7月月平均最高气温和当年2月降水量的相关性最高;与前一年11月至当年9月PDSI指数值都呈显著正相关,尤其6月和1-6月时段最突出.在此基础上,又对树轮序列中最窄和最宽年份进行了月均最高气温和月降水响应的实证分析,树轮宽窄变化与相关值最高的7月月平均最高气温和2月降水量及1-6月PDSI指数值的对照分析,并建立了树轮指数与1-6月PDSI指数的模拟方程.最后,利用树木出现的时间推断沙丘的形成应该与1938年花园口决堤有关.
In order to reveal the relationship between climatic factors and the radial growth of Pistacia chinensis in the study area, Average sensitivity, signal-to-noise ratio and total sample interpretation, indicating that the chronology contains more information on high-frequency climate change. The chronology and climatic factors (monthly average temperature, monthly mean maximum temperature, monthly mean minimum temperature, monthly precipitation And Palmer Drought Index (PDSI)) showed that the width of tree-ring was significantly and negatively correlated with the monthly mean maximum temperature in July and the monthly mean maximum temperature in June of the previous year, The monthly mean minimum temperature in September of last year was significantly and positively correlated with the precipitation in February and June of the previous year, especially in the previous year. The correlation between the monthly average minimum air temperature and the precipitation in February of the previous year was the highest. It was significantly and positively correlated with the PDSI index value from November to September of the previous year, especially in June and January to June. On the basis of this, the narrowest and widest years in tree-ring sequence Empirical analysis of monthly mean maximum air temperature and monthly precipitation response, tree round Width and width of the highest correlation between the highest monthly average monthly mean temperature and February rainfall and PDSI index value from January to June control analysis and establish a tree ring index and the PDSI index from January to June simulation equation.Finally, The time when the trees appear to infer that the dune formation should be related to the 1938 Huayuankou burst.