Abstract：In order to definite the effects of different proportion of chemical fertilizer replacing organic
fertilizer on active organic carbon and enzyme activity in yellow loam soil in Guizhou Province under equivalent
fertilization conditions，this paper took typical yellow loam soil samples from Guizhou Province as research
object and studied the effects on soil total organic carbon（TOC），dissolved organic carbon（DOC），readily
oxidized carbon（ROC），microbial biomass carbon（MBC），and soil cellulase，invertase，urease，acid
phosphatase activity，and pepper yield by 6 treatments of mixing compound fertilizer with chemical fertilizer
and organic fertilizer．These treatments included no fertilization（CK），100% chemical fertilizer（T1），70%
chemical fertilizer + 30% organic fertilizer（T2），50% chemical fertilizer + 50% organic fertilizer（T3），
30% chemical fertilizer + 70% organic fertilizer（T4），and 100% organic fertilizer（T5）．The results showed
that replacing chemical with organic fertilizer could increase the soil TOC，DOC，ROC，and MBC contents．
Compared with T1，the TOC，DOC，ROC and MBC contents were increased by 15.45%-55.82%，20.29%-
91.30%，34.85%-51.21%，37.78%-71.11%，respectively．While，the organic carbon pool management index
（CMI） was increased by 36.95%-53.78%．The soil cellulase，sucrase and urease activity all showed the
trend of increasing first then decreasing，and soil acid phosphatase activity showed a continual boosting trend
along with the increase of replacing proportion of organic fertilizer．Compared with the CK，fertilization could
significantly improve pepper yield．The pepper yield was the highest in T2（50% chemical fertilizer + 50%
organic fertilizer），reaching 25 765.63 kg·hm-2，obviously 13.90%-49.36% higher than the other fertilization
treatments．On the whole，replacing chemical fertilizer with organic fertilizer can increase the active organic
carbon content，soil organic carbon pool management index，microbial activity and pepper yield of yellow
soil．From the perspective of improving soil carbon sequestration and yield-increasing effect，the application
rate of 50% chemical fertilizer + 50% organic fertilizer is the recommended fertilization measure．
余 高 陈 芬 谢英荷 谭杰斌. 有机肥替代化肥比例对黄壤土活性有机碳及酶活性的影响[J]. 中国蔬菜, 2020, 1(4): 48-55.
YU Gao，CHEN Fen，XIE Ying-he，TAN Jie-bin. Effects of Chemical Fertilizer Replacing Organic Fertilizer Ratio on Active Organic Carbon and Enzymatic Activity in Yellow Loam Soil. China Vegetables, 2020, 1(4): 48-55.
