Root porosities and radial oxygen losses of Rumex and Plantago species as influenced by soil pore diameter and soil aeration.
Root porosities and radial oxygen losses of Rumex and Plantago species as influenced by soil pore diameter and soil aeration.
复制标题
酸模和车前草的根部孔隙度和径向氧损失受土壤孔径和土壤通气的影响。
DOI：
10.1111/j.1469-8137.1993.tb03904.x
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发表时间：
1993
期刊：
影响因子：
9.4
通讯作者：
C. Blom
中科院分区：
文献类型：
--
作者：
W. Engelaar;M. Bruggen;W. Hoek;M. Huyser;C. Blom
以沼泽酸模、乙酰酸模和车前草为材料，研究了土壤大孔径和小孔径石英砂中的低氧对根孔隙度的影响。少校。在低氧条件下，沼泽红豆杉在存在较大的土壤孔隙时，会产生较大的根孔。缺乏如此大的土壤孔隙导致了根结构的坍塌和根的生长减少。在低氧、土壤孔径较小或两者兼而有之的情况下，大根细胞间隙的增加似乎会导致根的孔隙度增加，但这并不显著。只产生数量有限的根孔较大的根。在土壤孔径较小的土壤中，无大孔根的根的形态结构也保持完整。在低氧条件下，醋栗的根孔隙度仅略有增加，在土壤孔径较小时，其形态结构也保持不变。沼泽芦根在淹水、松散的土壤中生长时发生了径向氧损失(ROL)。除淹水、压实的土壤外，所有处理都有一些根有ROL。醋栗不产生任何表现ROL的根。在田间条件下，充气组织在水分饱和、压实的土壤中毫无用处。这就解释了为什么像沼泽红假单胞菌这样的物种只在没有压实的低氧土壤上生长，而不是像大青霉那样生长在潮湿、压实的土壤上。无论是在非常潮湿的土壤上，还是在压实程度很高的土壤上，都找不到醋栗，因为在这些条件下，它不会产生健康的根系。
The effects of hypoxia in ballotini and quartz sand with respectively large and small soil pore diameters on root porosity was studied for Rumex palustris Sra., Rumex acetosa L. and Plantago major L. ssp. major. Under hypoxic conditions R. palustris produced large root pores when large soil pores were present. Absence of such large soil pores resulted in the collapse of the root structure and a reduced root growth. Increases in intercellular spaces in P. major roots seemed to result in a higher root porosity upon hypoxia, a small soil pore diameter or a combination of both but this was not significant. Only a limited number of roots with large root pores was produced. The morphological structure of P. major roots without large root pores remained intact also in soils with a small soil pore diameter. R. acetosa only slightly increased its root porosity upon hypoxia and its morphological structure also remained intact when soil pore diameter was small. Radial oxygen loss (ROL) was found in R. palustris roots when grown in waterlogged, uncompacted soils. P. major had some roots with ROL in all treatments except in waterlogged, compacted soil. R. acetosa did not produce any roots showing ROL. Under field conditions aerenchyma is of no use in water saturated, compacted soils. This explains why a species like R. palustris only grows on hypoxic soil when it is not compacted, in contrast to P. major which will grow on moist, compacted soils. R. acetosa cannot be found on either very moist or heavily compacted soil, since it does not produce a healthy root system under these conditions.