[Effects of different types of litters on soil organic carbon mineralization].
Using litter incubation experiment in laboratory, decomposition discrepancies of four typical litters from Zijin Mountain were analyzed. The results show that organic carbon mineralization rates of soil with litters all involve fast and slow decomposition stages, and the differences are that the former has shorter duration,more daily decomposition quantity while the latter is opposite. Organic carbon mineralization rates of soil with litters rapidly reached maximum in the early days of incubation, and the order is soil with Cynodon dactylon litter (CK + BMD) (23.88 +/- 0.62) mg x d(-1), soil with Pinus massoniana litter (CK+ PML) (17.93 +/- 0.99) mg x d(-1), soil with Quercus acutissima litter (CK+ QAC) (15.39 +/- 0.16) mg x d(-1) and soil with Cyclobalanopsis glauca litter (CK + CGO) (7.26 +/- 0.34) mg x d(-1), and with significant difference between each other (p < 0.05). This order has not significant correlation to litter initial chemical elements. The amount of organic carbon mineralized accumulation within three months incubation is (CK + BMD) (338.21 +/- 6.99) mg, (CK + QAC) (323.48 +/- 13.68) mg, (CK + PML) (278.34 +/- 13.91) mg and (CK + CGO) (245.21 +/- 4.58) mg. 198.17-297.18 mg CO2-C are released during litter incubation, which occupies 20.29%-31.70% of the total litter organic carbon amounts. Power curve model can describe the trends of organic carbon mineralization rate and mineralized accumulation amount,which has a good correlation with their change.
Shi
Xue-Jun
XJ
College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. 2006103089@njau.edu.cn
Pan
Jian-Jun
JJ
Chen
Jin-Ying
JY
Yang
Zhi-Qiang
ZQ
Zhang
Li-Ming
LM
Sun
Bo
B
Li
Zhong-Pei
ZP
D002244:Carbon / Q000032:analysis* / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry* / Q000378:metabolism; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000737:chemistry* / Q000235:genetics
D009930:Organic Chemicals; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon