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Clear‐cutting and slash burning effects on soil CO 2 efflux partitioning in C hinese fir and evergreen broadleaved forests in subtropical C hina
Author(s) -
Guo J.F.,
Chen G.S.,
Xie J.S.,
Yang Z.J.
Publication year - 2016
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12243
Subject(s) - soil respiration , evergreen , chemistry , flux (metallurgy) , zoology , environmental science , respiration , botany , biology , organic chemistry
Clear‐cutting ( CC ) and slash burning ( SB ) are common silvicultural practices in subtropical C hina, yet the time‐course response of soil CO 2 efflux components to such disturbance is not well understood. This study examined the effects of CC and SB on soil CO 2 efflux components in a C unninghamia lanceolata ( L amb.) H ook ( C hinese fir, CF ) plantation and a secondary evergreen broadleaved forest ( BF ) located in F ujian P rovince, southeastern C hina. Aboveground litter removal and root trenching were used to estimate CO 2 fluxes from soil organic matter decomposition ( R SOM ), litter decomposition ( R L ), and autotrophic respiration by roots and mycorrhizae ( R R ). These components were measured 5–7 times per month from 18 O ctober 2001 to 25 D ecember 2003 using soda lime absorption. We found that R R , R L and R SOM were initially higher in CC and SB plots than controls in both forests, but these three component fluxes in disturbed plots all fell below those of the control 5–20 months after the disturbance. Also, Q 10 values of these components decreased following disturbance. The annual flux of each respiration component was greater under BF than CF . The contribution of R R to soil CO 2 efflux in the control plots averaged 35% in CF and 46% in BF . R SOM was the dominant component of soil CO 2 efflux in CC and SB plots, accounting for over 50%. Our results highlight the importance of temporal trends of the component fluxes following disturbance and contribute to a broader understanding of forest management effects on the soil C cycle.