3.4. Soil C storage and respiration
Soil C storage and respiration varied with the land-use type (Fig. 6). C
storages of the control plot (P. australis wetland) and the grassland, flat
breeding, pond aquaculture and rice cropland were 136 ± 5, 197 ± 7,
122 ± 6, 68.8 ± 4.8 and 85.3 ± 4.4 Mg hm−2, respectively, and soil
respirations were 1.37 ± 0.08, 6.61 ± 0.33, 0.79 ± 0.08, 2.30 ±
0.11 and 1.29 ± 0.12 μmol m−2 s−1, respectively. Soil C storage
thus followed the decreasing order: grassland N P. australis wetland N
flat breeding N pond aquaculture N rice cropland and soil respiration followed the order: grassland N cropland N P. australis wetland N pond
aquaculture N flat breeding.