【摘要】：馬尾松人工林喬木層植物凋落物的分解對(duì)林地養(yǎng)分平衡和系統(tǒng)物質(zhì)循環(huán)具有重要意義,并可能受不同大小林窗下微環(huán)境差異的影響。采用凋落物袋分解法,以馬尾松(Pinus massoniana)人工林人為砍伐形成的7個(gè)不同大小林窗(G1:100 m~2、G2:225 m~2、G3:400 m~2、C4:625 m~2、G5:900 m~2、G6:1225m~2、G7:1600 m~2)為研究對(duì)象,林下(G0)為對(duì)照,研究林窗大小對(duì)紅椿(Toona ciliata)、楨楠(Phoebe zhennan)、香樟(Cinnamomum camphora)和馬尾松4種鄉(xiāng)土樹(shù)種凋落葉質(zhì)量損失及養(yǎng)分釋放的影響。結(jié)果顯示:1)林窗大小(G0-G7)顯著影響林窗中心放置的紅椿和楨楠凋落葉N和P釋放率、香樟凋落葉失重率和N、P、K釋放率以及馬尾松凋落葉P和K釋放率。相對(duì)于林下,中小型林窗(G1-G4)的凋落葉失重率和N、P釋放率明顯較大,而大型林窗(G6-G7)的凋落葉K釋放率明顯較大。2)林窗內(nèi)放置位置顯著影響紅椿、楨楠和馬尾松凋落葉的K釋放率及香樟凋落葉的P釋放率。紅椿和楨楠的凋落葉K釋放率從林窗中心到邊緣顯著減少,而馬尾松凋落葉K釋放率及香樟P釋放率從林窗中心到邊緣顯著增加。3)4種凋落葉類(lèi)型中紅椿凋落葉分解最快,其分解50%和95%所需時(shí)間分別為5.29和23.14個(gè)月。上述結(jié)果表明,林窗大小和林窗內(nèi)位置對(duì)凋落物質(zhì)量損失及其養(yǎng)分釋放具有顯著影響,但影響大小及趨勢(shì)隨物種初始基質(zhì)質(zhì)量的差異具有明顯變化,研究結(jié)果為亞熱帶低山丘陵區(qū)馬尾松人工低效林的科學(xué)經(jīng)營(yíng)及管理提高了一定的科學(xué)依據(jù)。
[Abstract]:The decomposition of litter in tree layer of Pinus massoniana plantation is of great significance to nutrient balance and systematic material circulation of forest land, and may be affected by the difference of microenvironment under different forest windows. The litter bag decomposition method was used to study 7 forest windows of different sizes (G1: 100m ~ 2G2: 2G3: 400m) (G1: 100m) and 2G5: 1225m2G771600mm2 (G0) under the forest, respectively, using the litter bag decomposition method as the research object, and the following forest (G0) as the control, and G5: 1225m2G71600mm2 (G0) under the forest as the control, and G5: 1225m2G71600mm2 as the control, G0 as the control, and G5: 1225m2G71600mm2. The effects of forest gap size on leaf mass loss and nutrient release of four native tree species, (Cinnamomum camphora) and Masson pine, were studied. The results showed that G0-G7 significantly affected the N and P release rates, the weight loss rate, the P and K release rates of leaves of Pinus massoniana and Pinus massoniana, which were placed in the center of the forest gap, and the weight loss rate of leaves of Cinnamomum camphora and the release rate of P and K in leaves of Pinus massoniana (Pinus massoniana). The litter weight loss rate and N ~ + P release rate of small and medium-sized forest windows (G1-G4) were significantly higher than that of forest gaps (G6-G7), while K release rate of large forest windows (G6-G7) was larger than that of small and medium-sized forest windows (G6-G7). (2) the location of leaves in small and medium-sized forest windows (G1-G4) significantly affected the weight loss rate and K release rate of leaves of Chinese toon. K release rate of littered leaves and P release rate of leaves of Cinnamomum camphora and Pinus massoniana were studied. The K release rate of leaves of Pinus massoniana and Pinus massoniana decreased significantly from the center to the edge of the forest, and the K release rate and P release rate of Cinnamomum camphora increased significantly from the center of the forest window to the edge of the four leaf types. The decomposition time of 50% and 95% was 5.29 and 23.14 months, respectively. The results showed that the gap size and the position of the canopy had a significant effect on litter mass loss and nutrient release, but the effect and trend varied significantly with the difference of the initial substrate mass of the species. The results provided a scientific basis for the scientific management and management of Pinus massoniana plantation in the subtropical hilly region.
【作者單位】： 四川農(nóng)業(yè)大學(xué)生態(tài)林業(yè)研究所四川生態(tài)林業(yè)工程重點(diǎn)實(shí)驗(yàn)室;
【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) 四川省科技廳應(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(lèi)號(hào)】：S714

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