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- Title
新疆开都河大型水生植物的氮磷化学计量特征 及其影响因素.
- Authors
彭庆文; 严正兵; 罗 艳; 李凯辉; 韩文轩
- Abstract
Nitrogen (N) and phosphorus (P) are two common mineral elements constraining plant growth. Nutrients in aquatic macrophytes are mainly absorbed from water and sediments, and thus elemental composition in plant tissues can reflect the nutritional status in freshwater ecosystems. Kaidu River is an important river flowing through the alpine meadows, deserts, and desert oases in Xinjiang. Herein, samples of aquatic macrophytes, water, and sediments across the Kaidu River were collected. Foliar stoichiometric characteristics of N and P in plants were examined among life forms and phylogeny. The differences and correlations among the stoichiometric characteristics of plants, water bodies, and sediments in the upstream and downstream and across different land use types were elaborated. Results showed that the means of leaf N and P concentrations and N/P mass ratio were 24.9 mg • g-1, 2.49 mg •g-1, and 12.6, respectively. There were significant differences in the leaf N and P stoichiometry among various life forms. Specifically, leaf N and P concentrations in submerged speeies were signilieantly higher than that in floating-leaved speeies and emergent speeies. The N/P of lloating-leaved speeies was 19.2 and signilieantly higher than that in other two lifeforms, indieating that their growth might be limited by P. Leal N and P concentrations were higher in the upstream than in the downstream. Nitrogen eontents in water and sediment were the higher in the upstream of the river. Compared with the river reaehes in larming areas, the higher N and P eoneentrations of aquatie maerophytes in the grassland regions might be related to the higher eontents of organie matter in grassland soils and of animal slurries lrom lloeks and herds, suggesting that grazing exerted larger impaet on the stoiehiometrie eharaeteristies of the Kaidu River eeosystem. Our lindings highlighted that overgrazing might aeeelerate the deterioration of water quality in the upstream of the Kaidu River, disturb the balanee of N and P in the aquatie eeosystem, and potentially inlluenee the biogeoehemieal eyeling.
- Subjects
BODIES of water; WATER quality; MOUNTAIN meadows; NITROGEN in water; PLANT cells &; tissues; MACROPHYTES; POTAMOGETON; GRASSLAND soils
- Publication
Yingyong Shengtai Xuebao, 2020, Vol 31, Issue 6, p2067
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202006.031