湖泊科学2017，Vol.29Issue(4)：880-886,7.DOI:10.18307/2017.0411
外源氮磷负荷比增加对刺苦草(Vallisneria spinulosa)生长的影响
Effect of increasing nitrogen/phosphorus ratio in loading on the growth of Vallisneria spinulosa
摘要
Abstract
Phosphorus (P) is a limiting factor for productivity in aquatic ecosystems.In order to control lake eutrophication,many effective measures are taken to control the P effluent in the basin,but nitrogen (N) is difficult to control due to its complex sources.Thus,the situation of low P but yet high N effluent results in a high ratio of N ∶P in loading in many lakes.Plants need a suitable N ∶ P ratio to sustain their growth,therefore,the increasing of the N ∶ P ratio in effluents might affect the growth of submerged macrophytes.To acquire an insight into the influence of increasing N ∶P ratios on the submerged plants,we carried out an outdoor control experiment.Vallisneria spinulosa was planted in plastic buckets with N and P added to the buckets every 3 days.We set up five treatments with an unchanging P loading dose of 4 mg/(m2 · d),with a range of nitrogen loading dose including 0,40,80,120 and 160 mg/(m2 · d).The experiment lasted for 80 days.Results showed that with an increase of the N ∶P ratio in the loading,some indicators were nearly stable,such as leaf dry weight,total plant dry weight,leaf N and total N content,leaf number,leaf P and total P content,while some other indicators,such as plant total root length,cloning stem length,stem dry weight and ramet numbers decreaed.The results above revealed that with an increasing N ∶P ratio in loading,individual growth indicators of V.spinulosa would remain stable or exhibit a minor increase,but that the indicators of population expansion ability,such as cloning stem length,tuber dry weight and ramet numbers,would decline,while the P absorption would not change with increasing N ∶P ratio in loading.关键词
沉水植物/氮磷负荷比/生长/形态/种群扩张潜力/刺苦草Key words
Submerged macrophyte/N ∶ P ratio in loading/growth/morphology/population expansion potential/Vallisneria spinulosa引用本文复制引用
张雪,郑建伟,周茂飞,殷春雨,关保华..外源氮磷负荷比增加对刺苦草(Vallisneria spinulosa)生长的影响[J].湖泊科学,2017,29(4):880-886,7.基金项目
国家自然科学基金项目(31270409)资助. （31270409）
