Backscattered electron scanning images of soil porosity for analyzing soil compaction around roots
Backscattered electron scanning images of soil porosity for analyzing soil compaction around roots
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DOI：
10.2136/sssaj1996.03615995006000030031x
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发表时间：
1996-05-01
影响因子：
2.9
通讯作者：
Begon, JC
中科院分区：
文献类型：
--
作者：
Bruand, A;Cousin, I;Begon, JC
用扫描电子显微镜研究了玉米根周围土壤的薄切片，采用背散射电子模式。土壤为细壤土，混合，中质，典型的Eutrochrept。利用背散射电子扫描图像（BESI）对所选玉米（Zea mays L.）根在微观和介孔尺度上进行了图像分析。BESI的图像分析显示，根周围土壤的孔隙度比散装土壤低22%至24%。在根-土界面附近，容重增加到1.80 Mg m（-3），而在非根土中为1.54 Mg m（-3）。孔隙率的降低包括中孔的去除和微孔的减少，这是由于骨架颗粒与多孔粘土相的填充。微孔受到影响，尽管它们通常被认为在自然条件下很难改变。用非线性回归分析方法对重塑土上植物根系周围土壤压缩模型进行了拟合。
Thin sections of soil surrounding maize roots were studied in scanning electron microscopy using the backscattered electron mode. The soil is a fine-loamy, mixed, mesic, Typic Eutrochrept. Backscattered electron scanning images (BESI) of the porosity surrounding a selected maize (Zea mays L.) root were studied by image analysis at the scale of micro- and mesopores. Image analysis of BESI revealed that the porosity was 22 to 24% less within the soil surrounding the root than in the bulk soil. The bulk density increased up to 1.80 Mg m(-3) close by the root-soil interface, although it was 1.54 Mg m(-3) in the bulk soil. The porosity reduction consisted of a removal of the mesopores and a decrease in micropores, which resulted from the packing of skeleton grains with the porous clayey phase. The micropores were affected, although they are usually thought to be altered only with difficulty under natural conditions. A model which was developed earlier for soil compression around roots of plants growing on remolded soils was fitted to the experimental data by nonlinear regression analysis.