中文摘要：

利用田间小区试验,研究了放养绿萍后对稻田水绵生长及田面水中N和P浓度变化的影响。在相同施肥水平下,绿萍处理的田面水中全N与NH4^＋-N浓度均低于无绿萍的处理。在分蘖期绿萍可调节土水中P的吸收与释放,减少了P肥损失的风险。此外,研究还发现施肥后的一段时间内,绿萍处理的田面水中叶绿素浓度变化较小,在20～45mg/m^3之间,而不施绿萍处理的田面水中叶绿素浓度逐渐增加,3～5天后浓度就远远大于绿萍处理,达到了85mg/m^3,说明绿萍生长可有效抑制藻类的爆发。

英文摘要：

In this paper the effects of Azoila inoculation on the growth of Spirogyra sp. and the variation in concentrations of nitrogen and phosphorus in flood-water in paddy field were studied by a field experiment. Under the same level of fertilization, the concentrations of total nitrogen and ammonium nitrogen in flood-water with Azolla application were less than those without Azolla application. During the tillering stage, the assimilation and release of phosphorous in soil-water could be modulated with Azolla application, which reduced the risk of phosphorous loss. in addition, chlorophyll content in flood-water with Azolla application changed little, ranging from 20 mg/m^3 to 45 mg/m^3, in contrast, chlorophyll content without Azolla application increased gradually and was much higher than with Azolla application after 3 to 5 days, up to 85 mg/m^3, indicating that the development of Azolla could inhibit algal bloom.