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以两个甜菜品种‘KWS0143’(耐盐碱性强)和‘Beta464’(耐盐碱性较弱)为对象,设置4个Na_2CO_3浓度处理[占土壤质量的0%(CK)、0.4%、0.8%和1.2%],采用盆栽方法研究甜菜幼苗时期植株干质量、根际土壤酶活性和微生物数量的变化.结果表明:与对照相比,0.4%处理的植株干质量明显增加,而0.8%和1.2%处理显著受到抑制,且处理间差异显著.不同处理下甜菜幼苗根际土壤脲酶、过氧化氢酶和碱性磷酸酶活性表现出相似的变化规律,0.4%处理酶活性较对照有所增加但不显著;0.8%和1.2%处理则显著降低了酶活性,同时‘KWS0143’的土壤酶活性均高于‘Beta464’.与对照相比,0.4%处理土壤微生物群落没有显著变化;0.8%和1.2%处理的根际土壤细菌、真菌和放线菌数量显著减少,且‘KWS0143’的根际微生物数量高于‘Beta464’.两品种植株干质量、土壤酶和土壤微生物之间呈显著正相关;通径分析表明,‘KWS0143’植株干质量决定系数表现为:放线菌>细菌>过氧化氢酶>脲酶>真菌>碱性磷酸酶,‘Beta464’表现为:放线菌>过氧化氢酶>脲酶>真菌>碱性磷酸酶>细菌.
Four Na_2CO_3 treatments (0% CK, 0.4% soil quality) were set up for two sugar beet varieties ’KWS0143’ (salinity tolerant) and ’Beta464’ (salinity tolerant) 0.8% and 1.2%, respectively]. The dry weight of roots, soil enzyme activities and the amount of microorganisms in the rhizosphere of the beet were studied by pot culture method.The results showed that the dry weight of 0.4% And 1.2% treatments were significantly inhibited, and there was significant difference between treatments.The activities of urease, catalase and alkaline phosphatase in rhizosphere soil of beet seedlings under different treatments showed similar changes, and the activity of 0.4% But 0.8% and 1.2%, respectively, significantly reduced the enzyme activity, while the enzyme activity of ’KWS0143’ was higher than that of ’Beta464’.Compared with the control, 0.4% did not significantly change the soil microbial community; 0.8% And 1.2% of rhizosphere soil, the numbers of fungi and actinomycetes in rhizosphere soil were significantly decreased, and the number of rhizosphere microbes in ’KWS0143’ was higher than that in ’Beta464’. The dry weight of two cultivars, soil enzyme and soil microbes were significantly positive Correlation; Path analysis shows that ’K WS0143 ’showed that the determinants of dry weight of plant were as follows: actinomycetes> bacteria> catalase> urease> fungi> alkaline phosphatase,’ Beta464 ’showed actinomycetes> catalase> urease> fungi> alkali Phosphatase> Bacteria.