本文選題：可溶性有機(jī)碳　切入點(diǎn)：林窗　出處：《東北林業(yè)大學(xué)學(xué)報(bào)》2016年01期 　論文類型：期刊論文

【摘要】：基于人工林近自然改造,調(diào)控低山丘陵區(qū)馬尾松低效林林分結(jié)構(gòu),探明馬尾松人工林不同面積林窗下,凋落葉可溶性有機(jī)碳(DOC)釋放規(guī)律。以長(zhǎng)江上游低山丘陵區(qū)人為采伐形成的馬尾松人工林7種林窗(100、225、400、625、900、1 225、1 600 m~2)為研究對(duì)象,研究不同面積林窗的馬尾松(Pinus massoniana)、紅椿(Toona ciliata)、樟(Cinnamomum camphora)、楨楠(Phoebe zhennan)等凋落葉可溶性有機(jī)碳(DOC)的損失率。結(jié)果表明:(1)林窗面積對(duì)凋落葉DOC損失率有顯著影響。中小面積林窗(225~625 m~2)內(nèi)凋落物的DOC損失率高于其它面積林窗。(2)經(jīng)過(guò)1 a的分解,4種凋落葉的DOC損失率為61.55%~90.06%,其中:DOC損失率紅椿最高,馬尾松最低。(3)凋落葉的DOC損失主要集中在分解前期(0~90 d),此后凋落葉的DOC損失速率不斷降低,且不同凋落物之間DOC損失速率的差異不斷減小。因此,在馬尾松低效林改造過(guò)程中,可利用中小面積林窗這一顯著作用,引入鄉(xiāng)土闊葉樹種紅椿、樟、楨楠,加速馬尾松人工林的物質(zhì)循環(huán),維持林地肥力。
[Abstract]:Based on the near natural transformation of plantation, the substructure of Pinus massoniana (Pinus massoniana) inefficiency Lin Lin was regulated in the low mountain and hilly region, and the different area of Pinus massoniana plantation was found under the forest window. The release rule of soluble organic carbon (DOC) from littered leaves was studied in 7 species of Pinus massoniana plantation (Pinus massoniana) planted in hilly area of upper reaches of the Yangtze River. The loss rates of Pinus massoniana, Toona ciliataer, Cinnamomum camphora and Phoebe Phoebe zhennananet in different areas of Pinus massoniana, Toona ciliata, Cinnamomum camphora, etc., were studied. The results showed that the area of the forest window had a significant effect on the loss rate of DOC. The DOC loss rate of litter was higher than that of other areas of forest. 2) after 1 year of decomposition, the DOC loss rate of four kinds of litters was 61.5510% and 90.06%, among which the loss rate of 1% DOC was the highest. The DOC loss of the litter leaves of Pinus massoniana was mainly concentrated in the early stage of decomposition, and the DOC loss rate of the leaves decreased continuously, and the difference of the DOC loss rates among different litters decreased continuously. Therefore, in the process of low efficiency forest transformation of Pinus massoniana, the DOC loss rate of the litter leaves decreased continuously in the early stage of decomposition, and the difference of the DOC loss rates among different litters was also decreased. The significant effect of small and medium area forest window can be used to introduce native broad-leaved tree species such as Toona sinensis, Cinnamomum camphora and Cynthia chinensis to accelerate the material circulation of Pinus massoniana plantation and maintain the fertility of forest land.
【作者單位】： 四川農(nóng)業(yè)大學(xué);
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31370628) 國(guó)家科技支撐計(jì)劃項(xiàng)目(2011BAC09B05) 四川省科技支撐計(jì)劃項(xiàng)目(12ZC0017) 四川省科技應(yīng)用基礎(chǔ)項(xiàng)目(2012JY0047) 四川省教育廳科技創(chuàng)新團(tuán)隊(duì)計(jì)劃項(xiàng)目(11TD006)
【分類號(hào)】：S714.2

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