阿尔泰山林区云杉和落叶松生物量分配格局研究

【目的】为了分析阿尔泰山地针叶主要树种生物量分配格局,【方法】基于2012、2013年研究区西伯利亚云杉(Picea obovata)和西伯利亚落叶松(Larix sibirica)实测样木,从年龄、径阶、林分郁闭度等角度,分析树木各组分器官生物量比例变化规律。【结果】两树种树干占整株树木地上生物量比例分别为48.1%、61.9%; 云杉枝、叶占地上生物量比例均高于西伯利亚落叶松; 两树种地上总生物量占整株生物量比例分别为79.8%和79.5%,平均根冠比为0.268和0.270。西伯利亚云杉树干生物量随径阶增大而提高,树叶和树根生物量随径阶增大而降低,树枝生物量随径阶变化幅度较小。西伯利亚落叶松树干生物量随径阶增大而提高,但在30 cm以上径阶比例稍有降低,树枝、树叶生物量与树干生物量呈相反变化趋势。两树种树干生物量均随年龄增加而提高,树枝、树叶生物量随年龄增加而降低。西伯利亚云杉树根生物量随年龄增加而降低,西伯利亚落叶松树根生物量随年龄增加呈先降后增的趋势。西伯利亚云杉树干生物量随郁闭度增加而提高,树枝、树叶和树根生物量随郁闭度增加而降低。西伯利亚落叶松总体上随郁闭度增加树干生物量呈先降后升趋势,树枝和树根生物量变化趋势与树干相反,树叶生物量随郁闭度增加而降低,但变化幅度很小。【结论】西伯利亚云杉和落叶松各组织器官生物量比例均呈现树干＞树根＞树枝＞树叶的趋势。随径阶、年龄、郁闭度增大,西伯利亚云杉树干生物量所占比例逐渐提高,树叶比例则逐渐降低,树枝与树根生物量此消彼长。西伯利亚落叶松各器官生物量所占比例在不同径阶、年龄和郁闭度条件下虽有变化,但幅度不大,总体趋势不变。

Biomass allocation patterns of Picea obovata and Larix sibirica in the Altai Mountains forest area

【Objective】In order to understand the biomass allocation pattern of main conifer species in the Altai mountains.【Method】Based on the sample wood data which measured from Picea obovata and Larix sibirica in 2012 and 2013, the changing law of biomass proportion of different organs was analyzed from age, DBH and the forest canopy. 【Result】The proportion of biomass of trunk which accounts for whole tree in Picea obovata and L. sibirica, was 48.1% and 61.9% respectively; The proportion of biomass of branches and leaves which accounts for whole tree in P. obovata was higher than that in L. sibirica. The proportion of aboveground biomass accounts for whole tree in two conifer species was 79.8% and 79.5% respectively, the root shoot ratio of P. obovata and L. sibirica was 0.268 and 0.270 respectively. With the increase of the diameter class, the biomass proportion of the trunks in P. obovata increased, the biomass proportion of leaves and roots decreased and the biomass proportion of branches varied slightly. With the increase of the diameter class, the biomass proportion of the trunks in L. sibirica increased, but it slightly decreased when the diameter was over 30cm, and the biomass proportion of branches and leaves showed an opposite trend to the trunks. With the increase of the age, the biomass proportion of the trunks in the two conifer species increased, the biomass of the branches and leaves decreased. With the increase of the age, the biomass proportion of the roots in P. obovata decreased, and the biomass proportion of the roots in L. sibirica decreased initially and then increased. With the increase of the canopy density, the biomass proportion of the trunks in P. obovata increased and the biomass proportion of branches, leaves and roots decreased. With the increase of the canopy density, the biomass proportion of trunks in L. sibirica decreased initially and then increased, the branches and roots showed an opposite trend to the trunks and the leaves slightly decreased.【Conclusion】 The biomass allocation ratio of P. obovata and L. sibirica showed trunks ＞ roots ＞ branches ＞ leaves trend. With the increase of the diameter class, age and canopy density,the biomass allocation ratio of trunks in P. obovata gradually increased and the biomass proportion of leaves decreased, the ratio of branches and roots presented as one increase with the other’s decrease. The biomass proportion in different organs of L. sibirica slightly varied, and the overall trend was unchanged.