Research Institute of Ecology Environment Sciences,Nanchang Institute of Technology,Jiangxi Key Laboratory of Degraded Ecosystem Restoration and Watershed Eco-Hydrology,Nanchang,,,,,,,
Clc Number:
S15712; S153. 61
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Abstract:
Better understanding of ecosystem organic carbon change after forest restoration on red eroded wasteland is essential to the carbon stocks recovery of the ecosystems with low carbon density. We investigated above- and below-ground carbon pools in wasteland on a slightly eroded red soil (HD), four artificial plantations, Schima superba and Pinus massoniana mixed forest (MM) , Broad-leaved forest (CK), Citrus reticulata forest (GJ) and closed forest(FY) that had been established on HD in 1984 in the subtropical China. The ecosystem carbon pool in MM(267.22 t/hm2)、KY (233.48 t/hm2)、FY (112.01 t/hm2) was significantly higher than in HD (27.04 t/hm2),but there was no significantly difference between GJ(84.16 t/hm2) and HD(P<0.05). The plant carbon pool in MM(187.88 t/hm2)、KY (164.17 t/hm2)、GJ(15.24 t/hm2)FY (61.75 t/hm2) was 43.56、38.06、3.53、14.32 times as that in HD(4.31 t/hm2) respectively. The soil carbon pool in MM(79.34 t/hm2) 、KY(69.31 t/hm2) 、GJ(68.93 t/hm2)、FY(50.26 t/hm2) was significantly higher than in HD(22.73 t/hm2) (P<0.05). The annual fine root biomass in MM(112.15 g/m2)、KY(88.71 g/m2)、GJ(257.70 g/m2)、FY(211.21 g/m2)was 1.21、0.96、2.79、2.29 times as in HD(92.33 g/m2)separately,which was significantly correlative with soil organic carbon density in the same soil horizon(P<0.05).The mean accumulation rates of ecosystem, above and below ground carbon pools in different restored forests range 2.04-8.58、0.39-6.56、0.98-2.02 Mg C/(hm2?yr1)respectively. Our results indicate that forceful artificial intervention maybe successful management practices to achieve rapid carbon accumulation on red eroded wasteland.