Drainage and fertilization effects on nutrient availability in an ombrotrophic peatland

被引:21
作者
Wang, Meng [1 ,2 ]
Talbot, Julie [3 ]
Moore, Tim R. [2 ]
机构
[1] Northwest A&F Univ, Coll Forestry, Ctr Ecol Forecasting & Global Change, Yangling, Shaanxi, Peoples R China
[2] McGill Univ, Dept Geog, Global Environm & Climate Change Ctr, Montreal, PQ, Canada
[3] Univ Montreal, Dept Geog, Montreal, PQ, Canada
基金
中国国家自然科学基金; 中国博士后科学基金; 加拿大自然科学与工程研究理事会;
关键词
Bog; Fen; Ion exchange; Disturbance; Seasonality; Stoichiometry; ATMOSPHERIC NITROGEN DEPOSITION; ION-EXCHANGE MEMBRANES; PRECIPITATION CHEMISTRY; SPHAGNUM MOSSES; CLIMATE-CHANGE; PLANT BIOMASS; WATER-TABLE; BOG; CARBON; PHOSPHORUS;
D O I
10.1016/j.scitotenv.2017.10.103
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nutrient availability is an important control on the vegetation distribution, productivity and functioning of peatland ecosystems and we examined spatial and temporal patterns of nutrient availability through ion exchange at Mer Bleue bog, southeast Ontario, Canada. We installed ion exchange probes at 5-15 cm for 4 weeks and determined nutrient sorption at undisturbed sites as well as those affected by nitrogen (N), phosphorus (P), potassium (K) fertilization and drainage. Under undisturbed conditions, the bog had very small amount of available nutrients, especially N(ammonium > nitrate) and P, and exhibited small variations in nutrient availability during the growing season (May to October). The increase in NPK availability upon fertilization was short-lived over the season and the stoichiometry of available NPK captured by the probes was mismatched with the vegetation. The increase in nutrient availability with drainage was confounded by substantial changes in vegetation. We compare these results with data from other Canadian bogs and fens to provide baseline data on nutrient availability in peatlands. (c) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:1255 / 1263
页数:9
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