A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central C...A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central China to analyze the effect of varying temperature and precipitation on growth along the gradi-ent.Correlation analyses showed that at all three altitudes and the TRW and EWW chronologies generally had signifi-cant negative correlations with mean and maximum tem-peratures in the current April and May and with minimum temperatures in the prior July and August,but significant positive correlations with precipitation in the current May.Correlations were generally significantly negative between LWW chronologies and all temperatures in the prior July and August,indicating that the prior summer temperature had a strong lag effect on the growth of P.tabuliformis that increased with altitude.The correlation with the standard-ized precipitation evapotranspiration index(SPEI)confirmed that wet conditions in the current May promoted growth of TR and EW at all altitudes.Significant altitudinal differences were also found;at 1400 m,there were significant positive correlations between EWW chronologies and SPEI in the current April and significant negative correlations between LWW chronologies and SPEI in the current September,but these correlations were not significant at 1450 m.At 1350 m,there were also significant negative correlations between the TRW and the EWW chronologies and SPEI in the prior October and the current July and between LWW chronology and SPEI in the current August,but these cor-relations were not significant at 1400 m.Moving correlation results showed a stable response of EWW in relation to the SPEI in the current May at all three altitudes and of LWW to maximum temperature in the prior July-August at 1400 m from 2002 to 2018.The EWW chronology at 1400 m and the LWW chronology at 1450 m were identified as more suitable for climate reconstruction.These results provide a strong scientific basis for forest management decisions and climate reconstructions in Central China.展开更多
植物物种多样性及其环境因子关系研究一直是自然地理学和山地生态学的重要研究内容之一，特别是在不同温度带过渡区。该文以位于中国暖温带和北亚热带过渡地区的伏牛山北坡的白云山国家级自然保护区为研究区，采用实地调查法，对1650-21...植物物种多样性及其环境因子关系研究一直是自然地理学和山地生态学的重要研究内容之一，特别是在不同温度带过渡区。该文以位于中国暖温带和北亚热带过渡地区的伏牛山北坡的白云山国家级自然保护区为研究区，采用实地调查法，对1650-2158 m 海拔高度范围内15个样地内的乔木、灌木和草本种类数及乔木丰富度指数（Margalef）和多样性指数Shannon-Wiener进行了统计分析和测算；在此基础上，运用主成分分析法对影响植物物种多样性变化的3类20种环境因子进行分选和排序，并进行相关性分析。主成分分析结果显示，影响白云山植物物种多样性空间格局的3类环境要素贡献率大小排列依次为地形要素最大、土壤性状次之、气象因子最小；海拔、土壤厚度、大气湿度等9种环境因子是影响植物物种多样性空间变化的主要因子。相关性分析结果表明：影响乔木物种多样性变化的环境因子最明确，无论乔本层种类数，还是丰富度指数和多样性指数都与海拔、土壤厚度极显著相关（p〈0.01），与坡向和速效磷含量显著相关（p〈0.05）；草本种类数与大气温度、土壤有机质和土壤碱解氮等微域气象或土壤性状关系密切；而影响灌木物种多样性变化的主要环境因子还尚不清晰，仅有坡向与之有统计上的显著相关性。研究结论丰富了秦岭-伏牛山作为中国主要气候区和生态区分界线的理论依据，同时也丰富了山地生态学理论。展开更多
基金This research was funded by National Key Research and Development Program of China(No.2018YFA0605601)National Natural Science Foundation of China(No.42077417,41671042).
文摘A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central China to analyze the effect of varying temperature and precipitation on growth along the gradi-ent.Correlation analyses showed that at all three altitudes and the TRW and EWW chronologies generally had signifi-cant negative correlations with mean and maximum tem-peratures in the current April and May and with minimum temperatures in the prior July and August,but significant positive correlations with precipitation in the current May.Correlations were generally significantly negative between LWW chronologies and all temperatures in the prior July and August,indicating that the prior summer temperature had a strong lag effect on the growth of P.tabuliformis that increased with altitude.The correlation with the standard-ized precipitation evapotranspiration index(SPEI)confirmed that wet conditions in the current May promoted growth of TR and EW at all altitudes.Significant altitudinal differences were also found;at 1400 m,there were significant positive correlations between EWW chronologies and SPEI in the current April and significant negative correlations between LWW chronologies and SPEI in the current September,but these correlations were not significant at 1450 m.At 1350 m,there were also significant negative correlations between the TRW and the EWW chronologies and SPEI in the prior October and the current July and between LWW chronology and SPEI in the current August,but these cor-relations were not significant at 1400 m.Moving correlation results showed a stable response of EWW in relation to the SPEI in the current May at all three altitudes and of LWW to maximum temperature in the prior July-August at 1400 m from 2002 to 2018.The EWW chronology at 1400 m and the LWW chronology at 1450 m were identified as more suitable for climate reconstruction.These results provide a strong scientific basis for forest management decisions and climate reconstructions in Central China.
文摘植物物种多样性及其环境因子关系研究一直是自然地理学和山地生态学的重要研究内容之一，特别是在不同温度带过渡区。该文以位于中国暖温带和北亚热带过渡地区的伏牛山北坡的白云山国家级自然保护区为研究区，采用实地调查法，对1650-2158 m 海拔高度范围内15个样地内的乔木、灌木和草本种类数及乔木丰富度指数（Margalef）和多样性指数Shannon-Wiener进行了统计分析和测算；在此基础上，运用主成分分析法对影响植物物种多样性变化的3类20种环境因子进行分选和排序，并进行相关性分析。主成分分析结果显示，影响白云山植物物种多样性空间格局的3类环境要素贡献率大小排列依次为地形要素最大、土壤性状次之、气象因子最小；海拔、土壤厚度、大气湿度等9种环境因子是影响植物物种多样性空间变化的主要因子。相关性分析结果表明：影响乔木物种多样性变化的环境因子最明确，无论乔本层种类数，还是丰富度指数和多样性指数都与海拔、土壤厚度极显著相关（p〈0.01），与坡向和速效磷含量显著相关（p〈0.05）；草本种类数与大气温度、土壤有机质和土壤碱解氮等微域气象或土壤性状关系密切；而影响灌木物种多样性变化的主要环境因子还尚不清晰，仅有坡向与之有统计上的显著相关性。研究结论丰富了秦岭-伏牛山作为中国主要气候区和生态区分界线的理论依据，同时也丰富了山地生态学理论。
