本文選題：森林經(jīng)營(yíng) + 土壤呼吸��； 參考：《生態(tài)學(xué)雜志》2017年05期

【摘要】：以水曲柳(Fraxinus mandschurica Rupr.)人工林為研究對(duì)象,探索林下植被去除處理對(duì)2015年生長(zhǎng)季土壤呼吸、土壤5 cm溫度和含水量,土壤微生物生物量碳(MBC)和氮(MBN)動(dòng)態(tài)以及細(xì)根生產(chǎn)量的影響。結(jié)果表明:植被去除導(dǎo)致土壤呼吸速率高于對(duì)照(平均11.87%),并在8月末和9月初達(dá)到顯著差異;土壤溫度和含水量也在處理后增加,土壤呼吸速率對(duì)溫度的敏感程度(Q10值)比對(duì)照提高15.26%。重復(fù)測(cè)量方差分析顯示,林下植被去除對(duì)土壤呼吸及其他指標(biāo)影響不顯著,但取樣時(shí)間的影響均顯著,而且二者對(duì)土壤呼吸速率、溫度和含水量的影響存在顯著交互作用。植被處理后,水曲柳細(xì)根年生產(chǎn)量比對(duì)照略增加,而其他樹種(主要為灌木)明顯降低;土壤表層(0~10 cm)和亞表層(10~20 cm)MBC分別比對(duì)照降低12.68%和21.16%,MBN降低16.76%和25.48%,但是MBC和MBN差異均未達(dá)到顯著水平。兩種處理中土壤呼吸速率僅與土壤溫度呈顯著指數(shù)相關(guān)。林分土壤溫度的升高,以及細(xì)根總生物量和組成的變化,可能是導(dǎo)致林下植被去除后土壤呼吸出現(xiàn)季節(jié)性增加的重要原因。本研究結(jié)果對(duì)理解溫帶地區(qū)林下植被去除對(duì)森林土壤呼吸的影響與機(jī)制提供了理論參考。
[Abstract]:Fraxinus mandschurica Rupr. The purpose of this study was to explore the effects of vegetation removal on soil respiration, soil temperature and water content, microbial biomass (MBC) and nitrogen MBN (soil microbial biomass) and fine root production during the growth season of 2015. The results showed that the rate of soil respiration was higher than that of the control (mean 11.87%), and the soil temperature and water content also increased after treatment in the end of August and the beginning of September, the results showed that the soil respiration rate was higher than that of the control (mean 11.87%). The sensitivity of soil respiration rate to temperature was 15.26% higher than that of control. Repeated analysis of variance showed that the effect of vegetation removal on soil respiration and other indexes was not significant, but the effect of sampling time was significant, and there was a significant interaction between them on soil respiration rate, temperature and water content. After vegetation treatment, the annual production of fine roots of Fraxinus mandshurica was slightly higher than that of the control, while other tree species (mainly shrubs) decreased obviously. The MBC decreased by 12.68% and 21.16% and 16.76% and 25.48%, respectively, but the difference between MBC and MBN was not significant. Soil respiration rate was only exponentially correlated with soil temperature in the two treatments. The increase of soil temperature and the change of total biomass and composition of fine roots may be the important reasons for the seasonal increase of soil respiration after the removal of undergrowth vegetation. The results of this study provide a theoretical reference for understanding the effects and mechanisms of forest soil respiration caused by the removal of undergrowth vegetation in temperate regions.
【作者單位】： 東北林業(yè)大學(xué)林學(xué)院;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(2016YFD060020101) 黑龍江省自然科學(xué)基金項(xiàng)目(C2016004)資助
【分類號(hào)】：S714;S792.41

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