Belowground carbon balance and carbon accumulation rate in the successional series of monsoon evergreen broad-leaved forest

Abstract

The balance, accumulation rate and temporal dynamics of belowground carbon in the successional series of monsoon evergreen broadleaved forest are obtained in this paper, based on long-term observations to the soil organic matter, input and standing biomass of litter and coarse woody debris, and dissolved organic carbon carried in the hydrological process of subtropical climax forest ecosystem-monsoon evergreen broad-leaved forest, and its two successional forests of natural restoration-coniferous and broad-leaved mixed forest and Pinus massoniana forest, as well as data of root biomass obtained once every five years and respiration measurement of soil, litter and coarse woody debris respiration for 1 year. The major results include: the belowground carbon pools of monsoon evergreen broad-leaved forest, coniferous and broad-leaved mixed forest, and Pinus massoniana forest are 23191 ± 2538 g·m −2 , 16889 ± 1936 g·m −2 and 12680 ± 1854 g·m −2 , respectively, in 2002. Mean annual carbon accumulation rates of the three forest types during the 24a from 1978 to 2002 are 383 ± 97 g·m −2 ·a −1 , 193 ± 85 g·m −2 ·a −1 and 213 ± 86 g·m −2 ·a −1 , respectively. The belowground carbon pools in the three forest types keep increasing during the observation period, suggesting that belowground carbon pools are carbon sinks to the atmosphere. There are seasonal variations, namely, they are strong carbon sources

Dynamics of soil organic carbon and dissolved organic carbon in Robina pseudoacacia forests

“…The increasing trend of soil carbon is not always represented in the entire forest chronosequence or at each depth. Zhou et al (2006) found that pioneer and transition forests had limited effects on SOC accumulation even if the aboveground biomass rapidly accumulates and reaches a high level. In the hilly Loess Plateau of China, Wang et al (2010) indicated that SOC contents are significant for different land covers in a semi-arid climate only at 5 cm soil surface depth.…”

Controls of litter quality on the carbon sink in soils through partitioning the products of decomposing litter in a forest succession series in South China

“…Some studies have revealed that pioneer and transition forests have limited effects on soil organic carbon (SOC) accumulation even if the aboveground biomass accumulates rapidly and has attained a high level (Richter et al, 1999;Paul et al, 2002;Hooker and Compton, 2003;Johnson et al, 2003;Zhou et al, 2006a;Don et al, 2009), especially for pine forests (Richter et al, 1999;Paul et al, 2002;Zhou et al, 2006a). On the contrary, other evidences showed that broadleaved forests or those with nitrogenfixing trees may allocate a higher fraction of NPP into soils (Paul et al, 2002;Resh et al, 2002;Mendoza-Vega et al, 2003;Bush, 2008;Kiser et al, 2009).…”

Extractive Resolution of racemic mandelic acid through a bulk liquid membrane containing binary chiral carrier

“…20 α-Cyclohexyl-mandelic acid, a derivative of MA, also has been studied by extraction. 21 But a single chiral selector is generally used for the resolution of MA and its derivatives, the enantioselectivity of these selectors are somehow low. 21 Based on the previous works, this paper investigated the extractive resolution of racemic MA (Figure 1), through a BLM by the complex of D2EHPA and L-(-)-DBTA as the binary chiral carrier, and tried to obtain the optimal conditions of extractive resolution.…”