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首页> 外文期刊>Plant and Soil >Sieve size effects on root length and biomass measurements of maize (Zea mays) and Grevillea robusta.
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Sieve size effects on root length and biomass measurements of maize (Zea mays) and Grevillea robusta.

机译：筛孔尺寸对玉米（玉米（Zea mays）和鲁氏硬脂菜）根长和生物量测量的影响。

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A study was conducted to investigate the effects of different mesh sizes on the recovery of root length and biomass and to determine whether the degree of recovery was influenced by plant species and sample location. Sieves of 2.0, 1.0, 0.5 and 0.25mm (4.0, 1.0, 0.25 and 0.06 mm2) mesh sizes were used to recover and measure the root length and biomass of Zea mays (maize) at 0-15 cm and 30-45 cm depths and of Grevillea robusta (grevillea) at the same depths 1.0 and 4.5 m from a line of grevillea trees. At 0-15 cm, the coarser sieves (sum collected with 2.0 and 1.0 mm sieves) recovered approximately 80% of the total root biomass measured, but only 60% of the root length. The proportion of total maize root length and biomass recovered by the coarsersieves decreased with soil depth. The proportion of total grevillea root length recovered by the coarser sieves was similar at the two soil depths, but increased slightly with distance from the tree line. The >=0.5 mm sieves recovered between 93 and 96%of grevillea and maize root biomass and between 73 and 98% of their root length, depending on the sample location. Roots passing through the 0.5 mm sieve, but recovered by the 0.25 mm sieve were about 20% of total maize root length and grevillea root length at 1.0 m from the tree line but <5% of the total grevillea root length at 4.5 m from the tree. Roots passing through the 0.5 mm sieve but recovered by the 0.25 mm sieve contributed only slightly to root biomass. Although the >=0.5 mm sieves provided adequate measurements of root biomass, the >=0.25 mm sieves were required for accurate measurement of fine root length. There was no universal correction for root length and biomass underestimation when large sieve sizes were used because the proportions of length and biomass recovered depended on the plant species and on soil depth and distance from the plant.
机译：进行了一项研究，以研究不同筛孔尺寸对根长和生物量恢复的影响，并确定恢复程度是否受植物种类和样品位置影响。使用2.0、1.0、0.5和0.25毫米（4.0、1.0、0.25和0.06平方毫米）筛目的筛子来回收和测量0-15厘米和30-45厘米深度的玉米根系长度和生物量和Grevillearobusta（grevillea）的距离，距一排Grevillea树的深度分别为1.0和4.5 m。在0-15厘米处，较粗的筛子（用2.0和1.0毫米筛子收集的总和）恢复了所测根系生物量的80％，但仅恢复了根系长度的60％。随着土壤深度的增加，粗筛回收的玉米根总长度和生物量的比例降低。在两个土壤深度下，较粗的筛子回收的总grevillea根长度的比例相似，但随着距林线距离的增加而略有增加。 > = 0.5 mm的筛网回收了grevillea和玉米根生物量的93％至96％，根长的73％至98％，具体取决于样品的位置。穿过0.5 mm筛子但通过0.25 mm筛子恢复的根在距树线1.0 m处约占玉米根总长度和grevillea根长度的20％，但在距树线4.5 m处约占grevillea根总长度的5％。树。穿过0.5 mm筛子但通过0.25 mm筛子恢复的根对根生物量的贡献很小。尽管> = 0.5 mm的筛子可以提供足够的根生物量测量结果，但是> = 0.25 mm的筛子仍需要精确测量细根长度。当使用大筛网时，没有对根长和生物量低估的普遍校正，因为回收的长度和生物量的比例取决于植物种类以及土壤深度和距植物的距离。

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