造林密度对米老排凋落物量及动态的影响

发布时间：2018-05-05 09:24

本文选题：造林密度 + 米老排　；参考：《植物研究》2017年05期

【摘要】：在2015年10月~2016年9月,采用90个凋落物收集器,研究不同造林密度对米老排人工林凋落物总量、组分及动态特征的影响。结果表明:年凋落物总量及各组分的产量与造林密度呈线性相关。随着造林密度的增加,林分的年凋落物总量、叶、花果和杂物的年凋落物量均呈现降低的趋势,而枝条的年凋落物量呈增加的趋势。不同造林密度米老排人工林的年凋落物量为6.52~8.17 t·hm~(-2)·a~(-1),其中叶为主要组分,占总量的86.2%~87.85%,枝条占0.35%~5.43%,花果占0.46%~4.67%,杂物占6.69%~8.89%。不同造林密度叶凋落物量的月动态变化均呈单峰型,最大值出现在9月,最小值在3~4月。枝条凋落物量的月动态变化呈不规则型,花果和杂物凋落物量均呈双峰型,花果的凋落主要集中在5和10月,而杂物的凋落量高峰在6和9月。凋落物总量与叶凋落物量的月动态变化基本相似,但在6月杂物凋落物量的影响下,有些密度的林分也会呈双峰型。当林分完全郁闭后,随着造林密度的增加,林分枝下高的增加,胸径、树冠比以及冠幅的减小,可能会导致凋落物总量、叶、花果及杂物凋落物量的下降,而枝条的凋落物量增加。
[Abstract]:From October 2015 to September 2016, 90 litter collectors were used to study the effects of different afforestation densities on the total litter amount, composition and dynamic characteristics of rice plantations. The results showed that there was a linear correlation between the total litter amount and the yield of each component and the afforestation density. With the increase of afforestation density, the annual litter amount of stands, leaves, flowers and fruits and sundries all showed a decreasing trend, while the annual litter amount of branches showed an increasing trend. The annual litter amount of the plantations with different planting densities was 6.52 ~ 8.17 t / hm ~ (-2) ~ (-2) ~ (-1) ~ (-1) ~ (-1). The leaves were the main component, accounting for 86.2 ~ 87.85% of the total, the branches were 0.35 ~ 5.43, the flowers and fruits were 0.464.6767, the other were 6.69 ~ 8.89 ~ (th). The monthly dynamic changes of leaf litter in different afforestation densities were single-peak, the maximum appeared in September, and the minimum value was from March to April. The monthly dynamic change of litter quantity of branches was irregular, the litter volume of flower and fruit and sundries were both bimodal, the litter of flower and fruit was mainly concentrated in May and October, and the peak of litter was in June and September. The monthly dynamic change of litter amount was similar to that of leaf litter, but some stands with density also showed double peak under the influence of litter quantity in June. When the stand was completely closed, with the increase of afforestation density, the height of branch, the diameter of DBH, the ratio of tree to crown and the width of crown could decrease the total amount of litter, leaf, flower and fruit, and litter. But the litter amount of branches increased.
【作者单位】：中国林业科学研究院热带林业研究所;热带林业研究国家林业局重点实验室;
【基金】：广东省林业科技创新项目(2016KJCX004)资助~~
【分类号】：S714

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