脱硫渣施用量对盐碱地油葵根际微生物区系的影响

分析盐碱地油葵在不同脱硫渣处理下其根际与非根际细菌、真菌、放线菌以及氨化细菌、好气性纤维素分解菌、固氮菌、硝化细菌生理类群的区系动态变化,研究盐碱地油葵对不同脱硫渣处理的响应规律。结果表明,随着脱硫渣施用量的增加,土壤中细菌和放线菌及4类生理细菌类群的数量均呈现出先上升后下降的趋势,其中脱硫渣为1.5 t/hm2时,每克干土中细菌数量为1.81×106个,放线菌的数量为3.62×105个,氨化细菌为9.37×105个,好气性纤维素分解菌为95.01×104个,固氮菌为15.71×103个。真菌呈现出先快速下降后缓慢上升的趋势;适宜的脱硫渣施用量有利于油葵根际细菌、放线菌及4类细菌生理类群数量的提高,过高则微生物数量下降;施用脱硫渣前后,各微生物类群都表现出明显的根际效应。

Effect of Desulfurization Application Rate on Microflora of Oil Sunflower Rhizosphere in Saline

The rhizosphere microflora dynamics of bacteria,actinomyces,fungi and four bacterial physiological groups of oil sunflower under different desulfurization treatments were studied by adopting selective culture medium to explain scientifically the response regular of the sunflower to different desulfurization condition.The results showed:The desulfurization application rate had significant effect on the quantity of microorganisms in oil sunflower field.The change of microorganisms population in rhizosphere soil showed a single-peaked curve with the increase of desulfurization application rate.When desulfurization application rate was 1.5t/ha,the quantity of bacteria,actinomyces,ammonification bacteria,aerobic cellulose decomposing bacteria and nitroge-fixing bacteria per gram of dry soil was 1.81×106,3.62×105,9.37×105,9.50×105 and 1.57×104,respectively.Optimal desulfurization application rate would lead to increase of the quantity of bacteria,actinomyces and four bacterial physiological groups in soil.The rhizospheral effect was noticeable in various microbial groups of oil sunflower before and after using desulfurization.