李丽,牛晓君,陆美青,邹定辉.环境中磷化氢对水稻根际环境与土壤有效磷的影响研究[J].环境科学学报,2015,35(6):1851-1857
环境中磷化氢对水稻根际环境与土壤有效磷的影响研究
- Effect of phosphine in the environment on rice rhizosphere and available phosphorus in soil
- 基金项目：国家自然科学基金(No.41071305,41105083,51008128);广东省社会发展研究项目(No.2011B031000012);中央高校基础研究基金(No.2012ZM0040)
- 李丽
- 华南理工大学环境与能源学院, 广州 510006
- 牛晓君
- 华南理工大学环境与能源学院, 广州 510006
- 陆美青
- 华南理工大学环境与能源学院, 广州 510006
- 邹定辉
- 华南理工大学环境与能源学院, 广州 510006
- 摘要：以稻田湿地中磷化氢为研究对象,采用室内模拟的方法,考察了不同浓度的磷化氢(0,1.4,4.2,7.0 mg · m-3)对水稻根际与非根际土壤的pH值、氧化还原电位、Fe2+、Mn2+、磷酸酶活性及有效磷的影响.结果表明:磷化氢导致根际土壤pH明显下降,非根际土壤中pH变化不明显.而氧化还原电位(Eh)则不同,磷化氢使水稻根际与非根际土壤的Eh均增大.磷化氢对Fe2+、Mn2+和碱性磷酸酶的影响具有相似性,磷化氢处理的前15 d,根际土壤中的Fe2+、Mn2+和碱性磷酸酶变化不明显,随着水稻的生长,根际土壤中的Fe2+和Mn2+随磷化氢浓度的增大而增加,随暴露时间的增加而减少;而根际土壤中的碱性磷酸酶随磷化氢浓度和暴露时间的增加而增加.非根际土壤中的Fe2+、Mn2+和碱性磷酸酶在磷化氢作用下变化不明显.水稻在磷化氢的环境影响下,根际与非根际土壤的有效磷含量都提高,表明一定浓度的磷化氢对土壤磷表现出活化效应.
- Abstract：The effects of phosphine (0, 1.4, 4.2, and 7.0 mg · m-3) on pH, Eh, Fe2+, Mn2+, the alkaline phosphatase activity and available phosphorus content in the rhizosphere and non-rhizosphere soil of rice seedlings were investigated in laboratory tests. The results indicated that pH in the rhizosphere soil dropped obviously but kept nearly constant in the non-rhizosphere soil. Eh in the rhizosphere and non-rhizosphere soil both increased under the treatments of phosphine. The effects of phosphine on Fe2+, Mn2+ and alkaline phosphatase were similar. In the first two weeks, changes of these factors were not significant, with the growth of rice and the contents of Fe2+ and Mn2+ increasing with the increase of phosphine concentration and decreasing with the increment of exposure time; Alkaline phosphatase activity in the rhizosphere soil increased with the increase of phosphine concentration and exposure time. The changes of Fe2+, Mn2+ and alkaline phosphatase activity in the non-rhizosphere soil were not obvious. Moreover, the content of available phosphorus in the rhizosphere and non-rhizosphere soil of rice seedlings improved under phosphine exposure, indicating that a certain concentration of phosphine caused activation of soil phosphorus.
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