本文選題：黑土 + 開(kāi)墾　； 參考：《東北林業(yè)大學(xué)學(xué)報(bào)》2017年06期

【摘要】：為探討開(kāi)墾對(duì)典型黑土土壤導(dǎo)氣率的影響,以未經(jīng)開(kāi)墾天然次生林(0 a)和開(kāi)墾年限為17、30、40 a耕地土壤為研究對(duì)象,采用PL-300型土壤導(dǎo)氣率測(cè)定儀測(cè)定耕作區(qū)0~20 cm土層水平、垂直2個(gè)方向的土壤導(dǎo)氣率,并計(jì)算其各向異性。結(jié)果表明:土壤水平、垂直導(dǎo)氣率均隨開(kāi)墾年限的增加而顯著減少(p0.05);與未開(kāi)墾天然次生林相比,土壤垂直導(dǎo)氣率下降22.44%~95.44%,土壤水平導(dǎo)氣率下降40.45%~92.50%;不同開(kāi)墾年限土壤水平、垂直導(dǎo)氣率均呈現(xiàn)出隨土層的加深而降低的一致規(guī)律。不同開(kāi)墾年限土壤導(dǎo)氣率各向異性表現(xiàn)出隨著開(kāi)墾年限增加逐漸增大的趨勢(shì),并在30、40 a表現(xiàn)出顯著性(p0.05)。土壤導(dǎo)氣率與密度呈極顯著負(fù)相關(guān),與孔隙度、非毛管空隙度、有機(jī)質(zhì)均呈極顯著正相關(guān)。黑土土壤的氣體傳輸能力隨開(kāi)墾年限逐漸降低,密度、孔隙度、非毛管空隙度、有機(jī)質(zhì)均顯著影響黑土土壤導(dǎo)氣率。
[Abstract]:In order to study the effect of reclamation on the gas conductivity of typical black soil, the soil of uncultivated natural secondary forest (0 a) and cultivated soil of 17 ~ 30 ~ 40 years was used as the research object. The soil layer level of 0 ~ 20 cm was measured by using PL-300 type soil conductivity meter. Soil gas conductivity perpendicular to two directions and its anisotropy calculated. The results showed that the soil level and vertical gas conductivity decreased significantly with the increase of reclamation years (p0.05), and the vertical gas conductance of soil decreased 22.445.44% and 40.45% 92.50, compared with that of unreclaimed natural secondary forest. The vertical gas conductivity showed a consistent law of decreasing with the deepening of soil layer. The anisotropy of soil gas conductivity in different reclamation years showed an increasing trend with the increase of reclamation years, and showed a significant (p0.05) at 30 ~ 40 years. Soil gas conductivity was significantly negatively correlated with density, but positively correlated with porosity, non-capillary porosity and organic matter. The gas transport capacity of black soil decreased gradually with the years of reclamation, density, porosity, non-capillary porosity and organic matter significantly affected the soil gas conductivity.
【作者單位】： 東北林業(yè)大學(xué);
【基金】：國(guó)家林業(yè)公益性行業(yè)科研專(zhuān)項(xiàng)(201404202)
【分類(lèi)號(hào)】：S152.6

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