Total nitrogen content,total nitrogen isotope(δ15 N),and free amino acid concentration in leaf of Phragmites australis(Cav.)Trin.ex Steud.under flooding for 0-11 d were studied.The results show that with the increase...Total nitrogen content,total nitrogen isotope(δ15 N),and free amino acid concentration in leaf of Phragmites australis(Cav.)Trin.ex Steud.under flooding for 0-11 d were studied.The results show that with the increase of flooding days,there is no significant variation in total nitrogen content in leaf of P.australis,δ15 N value shows a gradual tend to be negative,and concentrations of total free amino acids,Ser,Asp,and Asn first increase and then decrease.Under flooding for 1 d,δ15 N value decreases obviously and free amino acid concentration increases obviously compared with those under flooding for 0 d.It is indicated thatδ15 N value and free amino acid concentration are good indicators of P.australis under flooding condition.展开更多
文摘Total nitrogen content,total nitrogen isotope(δ15 N),and free amino acid concentration in leaf of Phragmites australis(Cav.)Trin.ex Steud.under flooding for 0-11 d were studied.The results show that with the increase of flooding days,there is no significant variation in total nitrogen content in leaf of P.australis,δ15 N value shows a gradual tend to be negative,and concentrations of total free amino acids,Ser,Asp,and Asn first increase and then decrease.Under flooding for 1 d,δ15 N value decreases obviously and free amino acid concentration increases obviously compared with those under flooding for 0 d.It is indicated thatδ15 N value and free amino acid concentration are good indicators of P.australis under flooding condition.