Trends of satellite derived chlorophyll-a (1997-2011) in the Bohai and Yellow Seas, China Effects of bathymetry on seasonal and inter-annual patterns.pdf

Soil respiration is affected by vegetation and environmental conditions. The purpose of this study was to investigate the effect of vegetation type on soil respiration, temperature and water content, and their correlations on a small scale. We measured soil respiration rate (R-s) over a 3-year period at biweekly intervals in three plots in the eastern Loess Plateau of China, with the same soil texture but different vegetation types: pine forest, grassland, and shrub land. Simultaneously, soil temperature (T-s) at 10cm depth and soil water content (W-s) within 10cm depth were measured. The seasonal course of R-s and T-s showed a similar temporal variation in the three plots, with higher values in summer and autumn and lower values in winter and spring. No significant differences (P>0.05) were found between plots, except for W-s. The mean cumulative release of CO2 efflux from March to December was 962.5, 1027.5, and 1166.5gCm(-2)a(-1) for plots 1, 2, and 3, respectively, with no significant difference between plots. The fitted exponential equations of R-s versus T-s from the 3-year data-set were significant (P0.05) were found between plots, except for W-s. The mean cumulative release of CO2 efflux from March to December was 962.5, 1027.5, and 1166.5gCm(-2)a(-1) for plots 1, 2, and 3, respectively, with no significant difference between plots. The fitted exponential equations of R-s versus T-s from the 3-year data-set were significant (P