造林密度對(duì)米老排凋落物量及動(dòng)態(tài)的影響
本文選題:造林密度 + 米老排; 參考:《植物研究》2017年05期
【摘要】:在2015年10月~2016年9月,采用90個(gè)凋落物收集器,研究不同造林密度對(duì)米老排人工林凋落物總量、組分及動(dòng)態(tài)特征的影響。結(jié)果表明:年凋落物總量及各組分的產(chǎn)量與造林密度呈線性相關(guān)。隨著造林密度的增加,林分的年凋落物總量、葉、花果和雜物的年凋落物量均呈現(xiàn)降低的趨勢(shì),而枝條的年凋落物量呈增加的趨勢(shì)。不同造林密度米老排人工林的年凋落物量為6.52~8.17 t·hm~(-2)·a~(-1),其中葉為主要組分,占總量的86.2%~87.85%,枝條占0.35%~5.43%,花果占0.46%~4.67%,雜物占6.69%~8.89%。不同造林密度葉凋落物量的月動(dòng)態(tài)變化均呈單峰型,最大值出現(xiàn)在9月,最小值在3~4月。枝條凋落物量的月動(dòng)態(tài)變化呈不規(guī)則型,花果和雜物凋落物量均呈雙峰型,花果的凋落主要集中在5和10月,而雜物的凋落量高峰在6和9月。凋落物總量與葉凋落物量的月動(dòng)態(tài)變化基本相似,但在6月雜物凋落物量的影響下,有些密度的林分也會(huì)呈雙峰型。當(dāng)林分完全郁閉后,隨著造林密度的增加,林分枝下高的增加,胸徑、樹冠比以及冠幅的減小,可能會(huì)導(dǎo)致凋落物總量、葉、花果及雜物凋落物量的下降,而枝條的凋落物量增加。
[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.
【作者單位】: 中國林業(yè)科學(xué)研究院熱帶林業(yè)研究所;熱帶林業(yè)研究國家林業(yè)局重點(diǎn)實(shí)驗(yàn)室;
【基金】:廣東省林業(yè)科技創(chuàng)新項(xiàng)目(2016KJCX004)資助~~
【分類號(hào)】:S714
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