摘要
以茶园土壤为研究对象,通过外源添加Al3+溶液,研究了Al3+胁迫对茶园土壤微生物区系及生理群的影响。结果表明,茶园土壤中的不同种类的微生物对Al3+的敏感性不同,Al3+添加量升至0.8 g/kg时,放线菌、真菌有一定的耐受性,而细菌数量呈快速下降趋势,亚硝化细菌几乎不能成活,但随着Al3+添加量的进一步升高,放线菌数量呈快速下降趋势,细菌数量则下降趋缓,而真菌相对能耐受较高浓度的Al3+;茶园酸性土壤中的微生物的绝大多数种类都面临低pH和Al3+的双重毒害;提高茶园土壤pH有利于活性Al3+向固定态转化,既能缓解低pH的不利影响,也解除了Al3+的毒害。改良茶园土壤酸性环境,是提高茶园土壤土著微生物数量和活性的较好方法之一。
The stimulation experiments of adding Al3+ to tea garden soil were conducted to investigate the effect of Al3+ on physiological groups of microorganisms in soil.The results showed that different kinds of microorganisms had different sensitivity to Al3+.Actinomycetes and fungi presented certain Al3+ tolerance when the concentration of Al3+ was lower than 0.8g/kg;while the number of bacteria was declined significantly.Nitrosobacteria was most sensitive to Al3+ for it could hardly survive when Al3+ was increase to 0.8g/kg.With the further increasing of Al3+ concentration,the number of bacteria was kept stable while actinomycetes presented the sharply decline.Compared with other microorganisms,fungi bad better tolerance to Al3+ and it could live under higher Al3+ concentration.Generally speaking,the microorganisms in acid soil of tea garden were poisoned by the low pH and Al3+.Increasing the pH value of tea garden soil was befitted for the fixation of active Al3+ and further mitigated the adverse impacts of Al3+.So,changing the acid condition of tea garden soil was one of the perfect way to improve the quantity and activity of microorganisms in soil.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2011年第6期36-38,43,共4页
Environmental Pollution & Control
基金
国家茶叶产业技术体系专项经费土壤肥料岗位子项目"基于土壤微生物角度的茶园土壤退化成因及防治与修复技术研究"
关键词
Al3+
胁迫
茶园土壤
微生物
Al3+
stress
tea plantation soils
microorganism