为了解树轮生长与气候间的关系是否受到海拔因素的影响,运用树木年代学方法,研究了长白山北坡沿海拔梯度岳桦径向生长与气候因素间的关系.响应分析结果显示,岳桦在其低海拔林线处(1 700 m a.s.l.)径向生长与当年1月月平均温度负相关,与...为了解树轮生长与气候间的关系是否受到海拔因素的影响,运用树木年代学方法,研究了长白山北坡沿海拔梯度岳桦径向生长与气候因素间的关系.响应分析结果显示,岳桦在其低海拔林线处(1 700 m a.s.l.)径向生长与当年1月月平均温度负相关,与上年9月月总降水量正相关(P<0.05).在中海拔森林内部(1 850 m a.s.l.)径向生长与上年6月、7月月平均温度负相关(P<0.05),与降水之间的响应关系不明显.高海拔林线处(2 000 m a.s.l.)岳桦径向生长与上年7月月平均温度负相关,与上年9月月平均温度正相关,与当年3月温度负相关,与当年7月温度呈正相关(P<0.05),此外,与当年6月降水量呈正相关(P<0.05).因此,随海拔梯度升高,岳桦年表中包含的气候信息量增加,岳桦径向生长对气候的敏感性增强.展开更多
The seedling stage test on 55 open-pollinated families of plus trees of Betula luminifera H. Winkl. from Shaowu, Nanping and Wuping in Fujian Province was carried out in State-owned Forest Farm of Weimin, Shaowu. The ...The seedling stage test on 55 open-pollinated families of plus trees of Betula luminifera H. Winkl. from Shaowu, Nanping and Wuping in Fujian Province was carried out in State-owned Forest Farm of Weimin, Shaowu. The genetic variations of Betula luminifera were studied, based on the investigation of 1-year-old seedling traits from different families. The results showed that there were abundant variations within the Betula luminifera and very significant differences among families in seedling height, diameter and lateral branch. The variations were mainly controlled by genetic factors. According to this analysis, 11 excellent families were tentatively selected, the average genetic gain of height and diameter were 18.72% and 10.44% respectively. The selection effect was very striking. The Shaowu region was probably a superior genetic resource area of Betula luminifera .展开更多
采用两因素随机区组设计,设置了5个水分梯度,即40%(W_1)、50%(W_2)、60%(W_3)、80%(W_4)、100%(W_5)的土壤田间持水量(FC)和3个施氮梯度,即模拟氮沉降施加0(对照,N_0)、20(N_1)、40(N_2)g N m^(-2)a^(-1)的硝酸铵,研究了水-氮耦合效应...采用两因素随机区组设计,设置了5个水分梯度,即40%(W_1)、50%(W_2)、60%(W_3)、80%(W_4)、100%(W_5)的土壤田间持水量(FC)和3个施氮梯度,即模拟氮沉降施加0(对照,N_0)、20(N_1)、40(N_2)g N m^(-2)a^(-1)的硝酸铵,研究了水-氮耦合效应对川西亚高山主要阔叶树种红桦(Betula albosinensis)幼苗根系生理活性的影响及根系在土壤水、氮胁迫下的生理调控机制。结果表明:1)随土壤含水量降低,根系活力和根系呼吸速率显著降低,膜脂过氧化产物(丙二醛)、渗透调节物质(脯氨酸、可溶性蛋白质和可溶性糖)含量及抗氧化物酶(超氧化物歧化酶、过氧化物酶和过氧化氢酶)活性显著升高。2)水-氮耦合效应对红桦幼苗根系生理特征影响显著:施氮(N_1和N_2)在土壤水分良好(W_4和W_5)时使根系活力和根系呼吸速率显著升高,而在土壤水分不足(W_1和W_2)时显著降低了根系活力和根系呼吸速率;且在水分不足时,施氮浓度越大根系活力、MDA含量、脯氨酸及可溶性蛋白质含量变化越显著;在W_3条件下,只有N_1对根系生理功能促进作用显著。3)根系活力和根系呼吸速率与丙二醛含量呈显著负相关性。因此,一定范围内的氮沉降在土壤水分状况良好时对植物根系生理特征具有显著正效应,而在土壤水分不足时则使根系细胞膜系统受损,抑制根系生理活性,但根系可通过增加渗透调节物质含量和增强抗氧化物酶活性来抵御一定范围的环境胁迫。展开更多
The thousand\|seed weight,germination rate and vitality of seeds for \%Betula luminifera\% were studied.The results showed that the thousand\|seed weight was different in various habitats,and varied with the age and t...The thousand\|seed weight,germination rate and vitality of seeds for \%Betula luminifera\% were studied.The results showed that the thousand\|seed weight was different in various habitats,and varied with the age and the part of crown and fruit.The seed had a longevity of 32～37 days in general and with a characteristic of the rapid germination.The seed had a high germination rate during the early stage or perk stage of seed dispersal,and a lower germination rate during the end stage.The germination rate and vitality of mature seed reduced with the increase of the storing time,the change in seed germination was significantly different at the various ages and habitats.展开更多
文摘为了解树轮生长与气候间的关系是否受到海拔因素的影响,运用树木年代学方法,研究了长白山北坡沿海拔梯度岳桦径向生长与气候因素间的关系.响应分析结果显示,岳桦在其低海拔林线处(1 700 m a.s.l.)径向生长与当年1月月平均温度负相关,与上年9月月总降水量正相关(P<0.05).在中海拔森林内部(1 850 m a.s.l.)径向生长与上年6月、7月月平均温度负相关(P<0.05),与降水之间的响应关系不明显.高海拔林线处(2 000 m a.s.l.)岳桦径向生长与上年7月月平均温度负相关,与上年9月月平均温度正相关,与当年3月温度负相关,与当年7月温度呈正相关(P<0.05),此外,与当年6月降水量呈正相关(P<0.05).因此,随海拔梯度升高,岳桦年表中包含的气候信息量增加,岳桦径向生长对气候的敏感性增强.
文摘The seedling stage test on 55 open-pollinated families of plus trees of Betula luminifera H. Winkl. from Shaowu, Nanping and Wuping in Fujian Province was carried out in State-owned Forest Farm of Weimin, Shaowu. The genetic variations of Betula luminifera were studied, based on the investigation of 1-year-old seedling traits from different families. The results showed that there were abundant variations within the Betula luminifera and very significant differences among families in seedling height, diameter and lateral branch. The variations were mainly controlled by genetic factors. According to this analysis, 11 excellent families were tentatively selected, the average genetic gain of height and diameter were 18.72% and 10.44% respectively. The selection effect was very striking. The Shaowu region was probably a superior genetic resource area of Betula luminifera .
文摘采用两因素随机区组设计,设置了5个水分梯度,即40%(W_1)、50%(W_2)、60%(W_3)、80%(W_4)、100%(W_5)的土壤田间持水量(FC)和3个施氮梯度,即模拟氮沉降施加0(对照,N_0)、20(N_1)、40(N_2)g N m^(-2)a^(-1)的硝酸铵,研究了水-氮耦合效应对川西亚高山主要阔叶树种红桦(Betula albosinensis)幼苗根系生理活性的影响及根系在土壤水、氮胁迫下的生理调控机制。结果表明:1)随土壤含水量降低,根系活力和根系呼吸速率显著降低,膜脂过氧化产物(丙二醛)、渗透调节物质(脯氨酸、可溶性蛋白质和可溶性糖)含量及抗氧化物酶(超氧化物歧化酶、过氧化物酶和过氧化氢酶)活性显著升高。2)水-氮耦合效应对红桦幼苗根系生理特征影响显著:施氮(N_1和N_2)在土壤水分良好(W_4和W_5)时使根系活力和根系呼吸速率显著升高,而在土壤水分不足(W_1和W_2)时显著降低了根系活力和根系呼吸速率;且在水分不足时,施氮浓度越大根系活力、MDA含量、脯氨酸及可溶性蛋白质含量变化越显著;在W_3条件下,只有N_1对根系生理功能促进作用显著。3)根系活力和根系呼吸速率与丙二醛含量呈显著负相关性。因此,一定范围内的氮沉降在土壤水分状况良好时对植物根系生理特征具有显著正效应,而在土壤水分不足时则使根系细胞膜系统受损,抑制根系生理活性,但根系可通过增加渗透调节物质含量和增强抗氧化物酶活性来抵御一定范围的环境胁迫。
文摘The thousand\|seed weight,germination rate and vitality of seeds for \%Betula luminifera\% were studied.The results showed that the thousand\|seed weight was different in various habitats,and varied with the age and the part of crown and fruit.The seed had a longevity of 32～37 days in general and with a characteristic of the rapid germination.The seed had a high germination rate during the early stage or perk stage of seed dispersal,and a lower germination rate during the end stage.The germination rate and vitality of mature seed reduced with the increase of the storing time,the change in seed germination was significantly different at the various ages and habitats.
