Seasonal variations in soil respiration and temperature sensitivity under three land-use types in hilly areas of the Sichuan Basin

摘要: CO(2) emissions from soils were measured under 3 land-use types at the adjacent plots of forest plantation, grassland, and cropland January 2005 to December 2006. Mean soil efflux rates during 2-year study varied 59 527 mg CO(2)/m(2). h in 37 498 32 397 cropland. Soil respiration showed a similar seasonal pattern variation both years, which single-peaked curve occurred early summer minimum winter. In particular, date maximum rate about 30 days earlier than grassland The relationship (R) with temperature (T) moisture (W) fitted well equation R = beta(0)e(beta 1T)W(beta 2) (a, b, c constants) other univariate models consider water content or alone. together explained 69-92% temporal types. Temperature sensitivity (Q(10)) was affected positively by top 0.1m layer negatively 0.05m depth. between Q(10) values indicated that 1 degrees C increase depth will reduce value 0.07, 0.05, 0.06 forest, cropland, respectively. Similarly, 1% decrease 0.10, 0.09, 0.11