“稻-蛙”共作生态系统中田面水的氮素动态变化

摘要

通过田间试验,研究了＂稻-蛙＂共作生态系统施肥后稻田田面水中各形态氮素的动态变化.试验结果表明,施肥后,田面水中各形态氮素含量显著提高,随后逐渐降低,并趋于稳定.相对于常规水稻处理,＂蛙-稻＂共作生态系统中的田面水pH值、NO-3-N浓度、NH＋4-N浓度和TN浓度显著提高.%Field experiments were conducted to study the dynamic variations of all kinds of nitrogen in floodwater of paddy fields in integrated rice-frog ecosystems.The results indicate that the content of all types of nitrogen appeared on the notable incr ease after fertilization.Then,they began to decrease slowly and kept level off.Compared with the conventional rice field in the integrated rice-frog ecosystem,pH,the content of NO-3-N,NH＋4-N,nitrogen appeared higher in floodwater of paddy fields.