[1] In this paper, we analyzed 3 years of carbon flux data from continuous eddy covariance measurements to investigate how soil moisture, rain pulses, and growth alter the response of ecosystem respiration to temperature. The data were acquired over an annual grassland and from the grass understory of an oak/grass savanna ecosystem in California. We observed that ecosystem respiration was an ex...

Temperature sensitivity of soil respiration is dependent on readily decomposable C substrate concentration A. A. Larionova, I. V. Yevdokimov, and S. S. Bykhovets Institute of Physicochemical and Biological Problems in Soil Science, RAS, 142290, Institutskaya 2, Pushchino, Moscow region, Russia Received: 16 May 2007 – Accepted: 13 June 2007 – Published: 26 June 2007 Correspondence to: I. V. Yevd...

The effects of salinity on soil organic carbon (SOC) and its labile fractions including microbial biomass carbon (MBC) and easily oxidation organic carbon (EOC), basal soil respiration, and soil nematode community in the Fluvents, an oasis in an arid region of northwestern China were investigated. Five sites were selected which had a salinity gradient with different groundwater table from 1.0 m...

Leached cinnamon soil is the main agricultural soil distributed in the North China Plain. In this research, leached cinnamon soil samples were collected in the upper basin of Miyun Reservoir (northeast of Beijing, China). The BaPS method (Barometric Process Separation) was applied to measure nitrification, denitrification and respiration rates. The rates of nitrification, denitrification and re...

Rising global temperatures may increase the rates of soil organic matter decomposition by heterotrophic microorganisms, potentially accelerating climate change further by releasing additional carbon dioxide (CO2) to the atmosphere. However, the possibility that microbial community responses to prolonged warming may modify the temperature sensitivity of soil respiration creates large uncertainty...

Warming temperatures and increasing CO2 are likely to have large effects on the amount of carbon stored in soil, but predictions of these effects are poorly constrained. We elevated temperature (canopy: +2.8 °C; soil growing season: +1.8 °C; soil fallow: +2.3 °C) for 3 years within the 9th-11th years of an elevated CO2 (+200 ppm) experiment on a maize-soybean agroecosystem, measured respiration...

Field measured respiration rates are necessary to size the appropriate oxygen supply equipment and to determine the proper injection/extraction flow rate and operating mode in the design of a bioventing system. Respiration rates are also used to estimate the amount of contaminant metabolized during the bioventing process. Almost all respiration tests are conducted in an open system subject to a...

The aim of our work was to survey and state the representative values and range of the microbial biomass carbon (Cmic) and microbial respiration activities in arable soils of three types (Chernozem, Luvisol, Planosol) and in pasture grassland soil (Cambisol). In arable soils no significant differences between the soil types were found concerning the content of Cmic. Way of soil use significantl...

This paper reviews investigations on interactions between soil microbiota, and plants during the interdisciplinary program ‘Ecosystem research in the Bornhöved Lake district’; it deals with processes associated with the rhizosphere at four agricultural, and forest ecosystems. Emphasis was placed on a black alder forest representing the interface between terrestrial and aquatic ecosystems. In th...

Little is known about biophysical controls on soil respiration in California’s Sierra Nevada oldgrowth, mixed-conifer forests. Using portable and automated soil respiration sampling units, we measured soil respiration rate (SRR) in three dominant patch types: closed canopy (CC), ceanothus-dominated patches (CECO), and open canopy (OC). SRR varied significantly among the patch types, ranging fro...