Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of exogenous phosphorus addition on soil respiration in Calamagrostis angustifolia freshwater marshes of Northeast China
Abstract Anthropogenic activities have increased phosphorus (P) inputs to wetland ecosystems. However, little is known about the effect of P enrichment on soil respiration in these ecosystems. To understand the effect of P enrichment on soil respiration, we conducted a field experiment in Calamagrostis angustifolia-dominated freshwater marshes, the Sanjiang Plain, Northeast China. We investigated soil respiration in the first growing season after P addition at four rates (0, 1.2, 4.8 and 9.6 g P m−2 year−1). In addition, we also examined aboveground biomass, soil labile C fractions (dissolved organic C, DOC; microbial biomass C, MBC; easily oxidizable C, EOC) and enzyme activities (invertase, urease and acid phosphatase activities) following one year of P addition. P addition decreased soil respiration during the growing season. Dissolved organic C in soil pore water increased after P addition at both 5 and 15 cm depths. Moreover, increased P input generally inhibited soil MBC and enzyme activities, and had no effects on aboveground biomass and soil EOC. Our results suggest that, in the short-term, soil respiration declines under P enrichment in C. angustifolia-dominated freshwater marshes of Northeast China, and its extent varies with P addition levels.
Research highlights ► In the short-term, soil respiration declined under P enrichment in Calamagrostis angustifolia-dominated freshwater marshes of Northeast China, and its extent varied with P addition levels. ► Dissolved organic C in soil pore water increased after P addition at both 5 and 15 cm depths. ► Increased P input generally inhibited soil microbial biomass C and enzyme activities, and had no effects on aboveground biomass and soil EOC.
Effect of exogenous phosphorus addition on soil respiration in Calamagrostis angustifolia freshwater marshes of Northeast China
Abstract Anthropogenic activities have increased phosphorus (P) inputs to wetland ecosystems. However, little is known about the effect of P enrichment on soil respiration in these ecosystems. To understand the effect of P enrichment on soil respiration, we conducted a field experiment in Calamagrostis angustifolia-dominated freshwater marshes, the Sanjiang Plain, Northeast China. We investigated soil respiration in the first growing season after P addition at four rates (0, 1.2, 4.8 and 9.6 g P m−2 year−1). In addition, we also examined aboveground biomass, soil labile C fractions (dissolved organic C, DOC; microbial biomass C, MBC; easily oxidizable C, EOC) and enzyme activities (invertase, urease and acid phosphatase activities) following one year of P addition. P addition decreased soil respiration during the growing season. Dissolved organic C in soil pore water increased after P addition at both 5 and 15 cm depths. Moreover, increased P input generally inhibited soil MBC and enzyme activities, and had no effects on aboveground biomass and soil EOC. Our results suggest that, in the short-term, soil respiration declines under P enrichment in C. angustifolia-dominated freshwater marshes of Northeast China, and its extent varies with P addition levels.
Research highlights ► In the short-term, soil respiration declined under P enrichment in Calamagrostis angustifolia-dominated freshwater marshes of Northeast China, and its extent varied with P addition levels. ► Dissolved organic C in soil pore water increased after P addition at both 5 and 15 cm depths. ► Increased P input generally inhibited soil microbial biomass C and enzyme activities, and had no effects on aboveground biomass and soil EOC.
Effect of exogenous phosphorus addition on soil respiration in Calamagrostis angustifolia freshwater marshes of Northeast China
Song, Changchun (Autor:in) / Liu, Deyan (Autor:in) / Song, Yanyu (Autor:in) / Yang, Guisheng (Autor:in) / Wan, Zhongmei (Autor:in) / Li, Yingchen (Autor:in) / Xu, Xiaofeng (Autor:in)
Atmospheric Environment ; 45 ; 1402-1406
15.12.2010
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch