不同开垦年限黑土耕地土壤导气率及其影响因素

发布时间：2018-07-05 20:06

本文选题：黑土 + 开垦　；参考：《东北林业大学学报》2017年06期

【摘要】：为探讨开垦对典型黑土土壤导气率的影响,以未经开垦天然次生林(0 a)和开垦年限为17、30、40 a耕地土壤为研究对象,采用PL-300型土壤导气率测定仪测定耕作区0~20 cm土层水平、垂直2个方向的土壤导气率,并计算其各向异性。结果表明:土壤水平、垂直导气率均随开垦年限的增加而显著减少(p0.05);与未开垦天然次生林相比,土壤垂直导气率下降22.44%~95.44%,土壤水平导气率下降40.45%~92.50%;不同开垦年限土壤水平、垂直导气率均呈现出随土层的加深而降低的一致规律。不同开垦年限土壤导气率各向异性表现出随着开垦年限增加逐渐增大的趋势,并在30、40 a表现出显著性(p0.05)。土壤导气率与密度呈极显著负相关,与孔隙度、非毛管空隙度、有机质均呈极显著正相关。黑土土壤的气体传输能力随开垦年限逐渐降低,密度、孔隙度、非毛管空隙度、有机质均显著影响黑土土壤导气率。
[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.
【作者单位】：东北林业大学;
【基金】：国家林业公益性行业科研专项(201404202)
【分类号】：S152.6

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