立地条件对长白落叶松养分生物学特性的影响

Effect of Site Condition on Biological Characteristics of the Nutrients in Larix olgensis

以黑龙江省佳木斯市孟家岗林场立地指数为11(差)、13(中)和17(好)的长白落叶松人工幼林作为研究对象,以氮、磷、钾为例,对其根(粗根边材、粗根心材、中根、小根)、树干(边材、心材)、枝(新鲜树枝、立枯枝)、树皮(新鲜树皮、死树皮)和针叶进行了养分生物学特性的研究。结果表明:小根(l≤2cm)、活枝、针叶中氮的质量分数,以及粗根(l≥5cm)、树干边材、针叶中磷的质量分数,和活树皮中钾的质量分数在3种立地条件下的林木之间,分别表现出显著的差异;其他器官中氮、磷、钾的质量分数在3种立地条件下的林木之间无显著差异;树干边材中氮、磷、钾的质量分数均显著高于树干心材,而粗根心材和粗根边材中氮、磷、钾的质量分数方面无显著差异;新鲜树枝和新鲜树皮中氮、磷、钾的质量分数均显著高于相应的立枯枝和死树皮;小根中氮、磷、钾的质量分数显著高于中根(2<l<5cm),中根中磷、钾的质量分数显著高于粗根。

An experiment was conducted to study the biological characteristics of nutrients in root （thick root, medium root and fine root）, stem （sapwood and heartwood）, branch （living branch and standing dead branch）, bark （living bark and dead bark） and needle of young Lar/x olgensis Henry grown on the stands with different site indexes （11, 13 and 17, respectively） in Mengjiagang Forest Farm in Kiamusze City. Results show that there are significant differences between the three kinds of young plantations in N contents in line root （l≤2 cm）, living branch and needle, P contents in thick root （l≥5 cm）, stem sapwood and needle, and K content in living bark, and there is no significant difference between the plantations in N, P and K contents in other tissues. N, P and K contents in stem sapwood are significantly higher than those in stem heartwood. No signilicant difference between the sapwood and heartwood of thick root （l≥5 cm） was found in N, P and K contents. N, P and K contents in living branch and living bark are significantly higher than those in standing dead branch and dead bark. Fine root（2 〈l 〈5 cm） has the highest N, P and K contents, and then followed by medium root and thick root in order.