生态科学2024，Vol.43Issue(2)：78-86,9.DOI:10.14108/j.cnki.1008-8873.2024.02.009
中国河湖岸带草本植物氮磷化学计量学及内稳性特征
Nitrogen and phosphorus stoichiometry and homeostasis characteristics of herbaceous plants in the riparian zone of rivers and lakes in China
摘要
Abstract
The riparian zone of river and lake is the ultimate barrier to intercept and purify N,P pollutants into rivers and lakes.Stability of herbaceous plants in riparian zone affects their ability to intercept and purify pollutants.Ecological stoichiometry and homeostasis characteristics of herbaceous plants were studied to provide basic data for the restoration and construction of herbaceous plant communities in riparian zone.The plant N,P stoichiometry and homeostasis characteristics and their relationships with environmental factors were analyzed by collecting data on the N,P contents in herbaceous plants above ground,soil or sediment and water in the riparian zones of rivers and lakes in China.The results showed that herbaceous plants in the lake area of Qinghai-Tibet Plateau had high N content(wetland plants:20.51 g.kg-1,aquatic plants:29.81 g.kg-1)and low P content(wetland plants:1.39 g.kg-1,aquatic plants:0.99 g.kg-1),N:P>14,exhibiting P limitation,while herbaceous plants in other lake areas had high P content(2.73 g.kg-1),N:P<14,showing N limitation.The N,P contents in plant and their ratios in different lake areas had certain spatial differences.The N content in aquatic plants was the highest in the lake area of Qinghai-Tibet Plateau,and the lowest in the lake area of Northeast Plain and Mountain(P<0.05).The P contents of wetland and aquatic plants were the highest in the lake area of Northeast Plain and Mountain(P<0.05).The N:P in wetland and aquatic plants were the highest in the lake area of the Qinghai-Tibet Plateau,and the lowest in the lake area of Northeast Plain and Mountain(P<0.05).The plant N,P contents,and N:P were most affected by P content in the environment,followed by N:P and N content in the environment.The homeostasis model showed that herbaceous plants in riparian zone belonged to the steady-state type,the homeostasis indices HN,HP,and HN:P of wetland plants were higher than those of aquatic plants,indicating that aquatic plants were more responsive to environmental stress.The differences in response of aquatic and wet plants to changes in N and P contents in the environment indicates that aquatic and wetland plants had different conservative utilization strategies for N and P in the environment.关键词
生态化学计量学/内稳性/氮磷/草本植物/河湖岸带Key words
ecological stoichiometry/homeostasis/nitrogen and phosphorus/herbaceous plants/riparian zones of rivers and lakes分类
资源环境引用本文复制引用
杨恒,张丹,李桂芳,叶远行,陈清飞,王蓉..中国河湖岸带草本植物氮磷化学计量学及内稳性特征[J].生态科学,2024,43(2):78-86,9.基金项目
国家自然科学基金项目(41701105) （41701105）
