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为探索环渤海重盐碱区咸水结冰灌溉下不同植被土壤根区微生物的生态特征,分别对灌后棉花、柽柳和枸杞3种植物试验地的土壤微生物种群数量、动态变化和土壤盐分变化进行了研究。结果表明:种植耐盐植物的土壤细菌、放线菌和真菌数量均显著高于裸地,分别平均增加了1.3~12.7倍,并且其组成比例为细菌>放线菌>真菌。经过咸水结冰灌溉后,试验地土壤微生物数量出现不同程度的增加,其中棉花和柽柳地微生物数量增加明显,分别平均增加了1.6倍和4.4倍。在植物生长季节,冬季咸水结冰灌溉和种植耐盐植物的试验地土壤微生物数量随时间呈现先增加后降低的趋势,而裸地微生物数量时间动态变化不明显。冬季咸水结冰灌溉有效地降低了土壤盐分,各处理均低于5g/kg,保证了以上3种植物的正常生长,增加了土壤微生物种群数量。
In order to explore the ecological characteristics of the rhizosphere microbes in different vegetation soils under salt water icy saline irrigation in the Bohai Sea, the changes of population, dynamics and changes of soil salinity were studied in the test sites of cotton, Tamarix and Lycium barbarum Were studied. The results showed that the number of soil bacteria, actinomycetes and fungi of salt-tolerant plants were significantly higher than that of bare land, which increased by 1.3 ~ 12.7 times on average respectively, and their composition ratio was bacteria> actinomycetes> fungi. After saline water irrigation, the amount of soil microorganism in the experimental soil increased to some extent. The amount of microorganisms in cotton and tamarisk increased significantly by an average of 1.6 times and 4.4 times respectively. During the plant growth season, the quantity of soil microorganisms in experimental saline-water irrigation and planting salt-tolerant plants increased at first and then decreased with time, while the dynamic changes of soil microbes in bare land were not obvious. Freezing irrigation in saline water in winter effectively reduced soil salinity, and all treatments were lower than 5g / kg, which ensured the normal growth of the above three plants and increased the population of soil microorganisms.