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首页> 外文期刊>Plant and Soil >Response of cucumber (Cucumis sativus L.) to an unequal distribution of salts in the root environment.
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Response of cucumber (Cucumis sativus L.) to an unequal distribution of salts in the root environment.

机译：黄瓜（Cucumis sativus L.）对根系环境中盐分分布不均的响应。

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摘要

Plant response to salinity as affected by an unequal distribution of salts in the root environment was studied with cucumber as a test crop. In a series of six experiments use was made of a split root system, in which the plants were grown in separated rockwool strips irrigated with nutrient solutions with equal or different EC [electrical conductivity] values, predetermined by different concentrations of either nutrients or NaCl. From low to standard EC values the uptake of nutrients was highest in the root parts with the highest concentration of nutrients. In root parts with concentrations of nutrients >4 dS m-1, the uptake decreased rapidly. Nutrient uptake from one root part with high NaCl concentrations was also retarded, if the NaCl concentration supplied to the other root part was low. If both root parts were supplied with high NaCl concentrations, the plant was able to adjust and absorbed adequate amounts of nutrients, despite the high NaCl concentrations. Water was preferably absorbed from the root part with the lowest EC. However, if no nutrients were supplied in one of the root parts the water uptake from that root part was retarded. Effects of high NaCl concentrations in specifically retarding the water uptake were not established from the data of the experiments. The results are discussed in relation to existing models predicting effects of spatial variation of salinity in the root environment under growing conditions in the glasshouse industry and in relation to the experiences previously gained with tomato.
机译：以黄瓜为试验作物，研究了根部环境中盐分分布不均对植物对盐分的响应。在一系列的六个实验中，使用了分开的根系，其中的植物在分开的岩棉条中生长，这些岩棉条用营养液灌洗，这些营养液具有相同或不同的EC [电导率]值，并由不同浓度的营养物或NaCl预先确定。从低EC值到标准EC值，养分浓度最高的根部养分吸收量最高。在养分浓度> 4 dS m-1的根部，吸收迅速降低。如果供应给另一根的NaCl浓度低，则从高根NaCl的一个根部吸收营养素也会受到阻碍。如果两个根部都提供高浓度的NaCl，尽管NaCl浓度高，植物仍能够调节并吸收足够量的养分。优选从具有最低EC的根部吸收水。但是，如果在根部之一中没有提供营养，则该根部的水分吸收会受到阻碍。从实验数据中未确定高NaCl浓度对特定水吸收的影响。讨论了与现有模型相关的结果，该模型预测了温室产业在生长条件下根系环境中盐度的空间变化的影响，并且与先前使用番茄获得的经验有关。

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