Effects of biopores on the growth and N-uptake of wheat at three levels of soil moisture
Effects of biopores on the growth and N-uptake of wheat at three levels of soil moisture
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DOI：
10.4141/cjss96-056
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发表时间：
1996-11
影响因子：
1.7
通讯作者：
K. Volkmar
中科院分区：
文献类型：
--
作者：
K. Volkmar
根在土壤空间如空出来的根道中比在未受扰动的土壤中生长得更快。进行该实验以确定营养物质的转移被孔壁和根之间的间隙损害的程度。未受干扰的核心是从一个免耕深褐色的酸性土壤。将样芯分为3个2.5 cm厚的段（3.8-6.3 cm、7.8-10.3 cm和11.75-14.25 cm土层）。目视评估每个节段中直径为200-500 μm（P200）和500-1000 μm（P500）的孔的密度。通过加入K15 NO3标记的水，将岩心的水势调节至− 0.01、− 0.1和− 1.5 MPa。将装有小麦（Triticum aestivum）植物的盆置于芯的顶部，并在72 h后测量出现在芯底部的根的数量、芯内的根长度和地上部15 N含量。小孔隙（P200）密度没有影响根数在任何水分水平。大孔（P500）密度与孔隙度呈正相关。
Roots grow more rapidly through soil spaces such as vacated root channels than through undisturbed soil. This experiment was conducted to determine the extent to which transfer of nutrients is compromised by gaps between the pore wall and the root. Undisturbed cores were obtained from a no-till Dark Brown Chernozemic soil. The cores were divided into three 2.5-cm-thick segments (3.8–6.3 cm, 7.8–10.3 cm, and 11.75–14.25 cm soil layers). The density of 200–500 μm (P200) and 500–1000 μm (P500) diameter pores was visually assessed in each segment. The cores were adjusted to water potentials of − 0.01, − 0.1 and − 1.5 MPa by adding K15NO3-labelled water. Pots containing wheat (Triticum aestivum) plants were placed on top of the cores and the number of roots that appeared at the bottom of the cores, the root length within the cores, and shoot 15N content were measured after 72 h. Small pore (P200) density had no effect on root number at any moisture level. Large pore (P500) density correlated positively with ro...