7Bowden RD, Davidson E, Savage K, et al. 2004. Chronic nitro- gen additions reduce total soil respiration and microbial res- piration in temperate forest soils at the Harvard Forest. For- est Ecology and Management, 196: 43-56.
8De Jong E, Schappert HJV, MacDonald KB. 1974. Carbon dio- xide evolution from virgin and cultivated soil as affected by management practices and climate. Canadian Journal of Soil Science, 54: 299-307.
9Ding WX, Cai Y, Cai ZC, et al. 2006. Diel pattern of soil res- piration in N-amended soil under maize cultivation. Atmos- pheric E,wironment, 40 : 3294-3305.
10Dixon RK, Brown S, Houghton RA. 1994. Carbon pools and flux of global forest ecosystems. Science, 263:185-190.
