UPTAKE BY POTAMOGETON CRISPUS OF NITROGEN AND PHOSPHORUS FROM WATER AND SOME AFFECTING FACTORS
菹草（Potamogeton crispus）对水中氮、磷的吸收及若干影响因素

菹草（Ｐｏｔａｍｏｇｅｔｏｎ ｃｒｉｓｐｕｓ）对水中氮，磷的吸收与ＰＨ，光照，水温，根／茎生物量比及底泥间隙水与上覆水中营养盐浓度比有关。在ＰＨ为８．０－９．５，水温为１９－２８℃的实验条件下，水中ＮＨ４－Ｎ浓度低于０．３５ｍｇ．１＾－１左右时，菹草茎，叶优先吸收ＮＯ３－Ｎ；水中ＮＨ４－Ｎ浓度大于０．３５ｍｇ．１＾－１左右时，菹草测优先吸收ＮＨ４－Ｎ这一选择吸收与ＮＨ４－Ｎ／ＮＯ３－Ｎ比值无关，强