本文選題：馬尾松　切入點(diǎn)：林分密度　出處：《生態(tài)學(xué)報(bào)》2017年22期 　論文類型：期刊論文

【摘要】：凋落物是森林生態(tài)系統(tǒng)的重要組成部分,其產(chǎn)量與基質(zhì)質(zhì)量是影響植物-土壤間養(yǎng)分循環(huán)的重要因素。以3種密度馬尾松人工純林為研究對(duì)象,分析松針凋落模式及基質(zhì)質(zhì)量變化規(guī)律,比較不同林分密度間松針凋落特性差異,探討松針基質(zhì)質(zhì)量、產(chǎn)量及氣候因素間的關(guān)系。結(jié)果表明:松針凋落數(shù)量動(dòng)態(tài)變化屬雙峰型,在2月呈現(xiàn)一個(gè)小高峰,在10/11月達(dá)最高峰。3種密度林分中各月凋落松針的N、P濃度均差異顯著(P0.05),全年最高值出現(xiàn)在4—6月,8—12月的松針N、P濃度顯著低于其他時(shí)段;不同月份凋落松針木質(zhì)素濃度也差異顯著(P0.05),在2月木質(zhì)素含量達(dá)峰值,7、8月含量較低;3種密度林分中各月凋落松針的C/N、C/P、L/N和L/P比存在顯著差異(P0.05),4—6月呈現(xiàn)最低值,9/11/12月則出現(xiàn)最高值,相差達(dá)2—3倍,且均高于養(yǎng)分釋放臨界值,不利于松針N素和P素的釋放。林分密度對(duì)松針凋落數(shù)量和N濃度影響顯著(P0.05),中等密度林分松針凋落數(shù)量高于低、高密度林分,中、高密度林分凋落松針N濃度顯著高于低密度林分。凋落松針基質(zhì)質(zhì)量與自身凋落數(shù)量密切相關(guān),并且受氣溫和降水量的影響。凋落松針N、P濃度與凋落數(shù)量呈顯著負(fù)相關(guān)(P0.05),C/N、C/P、L/N、L/P比與凋落數(shù)量呈顯著正相關(guān)(P0.05),說明更多凋落物產(chǎn)量將伴隨著更低的基質(zhì)質(zhì)量,將有更慢的分解速度。
[Abstract]:Litter is an important part of forest ecosystem, and its yield and substrate quality are important factors affecting nutrient cycling between plant-soil. The variation of pine needle litter pattern and substrate quality was analyzed, the characteristics of pine needle litter were compared among different stand densities, and the relationships among substrate quality, yield and climatic factors were discussed. The results showed that the dynamic change of pine needle litter number was a bimodal type. In February, there was a small peak, in 10/11 months reached the highest peak of 3 kinds of density stands, in each month there were significant differences in the concentration of N P of pine needles, the highest value of the whole year appeared in April to June, August to December, the concentration of N P in pine needles was significantly lower than that in other periods. The lignin concentration of pine needles also showed significant difference in different months. The lignin content reached a peak value in February and reached a peak value in February. In August, there was a significant difference in the C / N / P / N and L / P ratios of C / N / P / N and L / P in the three density stands with lower densities. The lowest value was found in April to June, and the highest value appeared in 9 / 11 / 12 months. The difference was 2-3 times, and higher than the critical value of nutrient release, which was not conducive to the release of N and P in pine needles. Stand density had a significant effect on the number and concentration of pine needles (P0.05N), and the number of pine needles litter in medium density stands was higher than that in low, high-density stands. The N concentration of pine needles in high density stands was significantly higher than that in low density stands. Under the influence of air and precipitation, there was a significant negative correlation between the concentration of N ~ (+) P and the number of litters. There was a significant positive correlation between the ratio of P ~ (0.05) C / P ~ (1 / P) and the number of litters, which indicated that more litter yield would be accompanied by lower substrate quality and slower decomposition rate.
【作者單位】： 貴州大學(xué)貴州省森林資源與環(huán)境研究中心;貴州師范大學(xué)地理與環(huán)境科學(xué)學(xué)院;貴州大學(xué)林學(xué)院;
【基金】：國家科技支撐項(xiàng)目(2015BAD09B0102) 貴州省科技重大專項(xiàng)(黔科合重大專項(xiàng)字[2012]6001號(hào)) 貴州省林業(yè)重大專項(xiàng)(黔林科合[2010]重大03號(hào)) 國家自然科學(xué)基金項(xiàng)目(41261058)
【分類號(hào)】：S714

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