Adaptability of Avena sativa to Coastal Saline-Salt Soil and Its Function on Salt Absorption and Soil Improvement
In order to explore the adaptability of oat(Avena sativa)to the coastal saline-salt soil and its effects on salt absorption and soil improvement,the oat variety Baiyan 2 was used as material,and 6 areas with 3 degrees of saline soil(mild,moderate,severe)were designed in Dongying City of Shandong Province.The oat seeds were sown after thaw in early spring.The agronomic traits and field coverage were observed,and the whole plant yield,grain yield and contents of soluble salt and Na+in different parts of oat plants and soils in 0～20-cm layer at harvesting stage were determined.The results showed that Baiyan 2 could grow in all the 3 degrees of coastal saline-salt soil with difference in adaptability.The whole plant yield ranged from 3.320 to 18.780 t·hm-2,the grain yield ranged from 0.456 to 4.106 t·hm-2,and the basic trend was mild saline soil>moderate saline soil>severe saline soil.A part of soluble salt could be moved out of the saline soil by oat plants based on their salt storage capacity,and the contents moved by the whole plant and grains were 0.161～1.508 and 2.961～43.242 kg·hm-2,respectively.More salts accumulated at the soil surface after the salt accumula-tion peak in spring,while the soluble salt and Na+contents in 0～20-cm layer of soil at harvesting stage de-creased in various degrees.The results of allocation of soluble salt and Na+showed that the soluble salt content was the highest in oat straw as 96.954 g·kg-1,which was 3.576 and 12.803 times of that in roots and grains respectively.The content of Na+was the highest as 20.242 g·kg-1 in straw,which was 5.190 and 55.763 times of that in roots and grains,respectively.In conclusion,the oat plants improved salt tolerance by allocating sol-uble salt and Na+to different tissues reasonably.Above all,the oat plants performed obvious improvement effects on coastal saline-salt soil by absorbing and storing a certain amount of salts and moving them out after harvest.
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