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Effects on rhizospheric and heterotrophic respiration of conversion from primary forest to secondary forest and plantations in northeast China.
- Source :
-
European Journal of Soil Biology . Jan2015, Vol. 66, p11-18. 8p. - Publication Year :
- 2015
-
Abstract
- To evaluate the effects of forest transition (conversion of primary temperate forest into secondary forest and plantations) on rhizospheric ( R R ) and heterotrophic respiration ( R H ), we used the trenching-plot and infrared gas exchange analyzer approaches to partition soil respiration ( R S ) for four temperate forest types in northeast China, including the primary mixed broadleaved-Korean pine ( Pinus koraiensis ) forest, secondary birch ( Betula platyphylla ) forest, Dahurian larch ( Larix gmelinii ) plantation and Korean pine plantation, throughout the growing season (May–October) in 2011 and 2012. The results showed that R S and its components displayed obvious seasonal dynamics and were mainly controlled by soil temperature. Furthermore, incorporating soil moisture into the pure R S ( R H )-temperature model improved the prediction of R S and R H in most forest types ( R S , R 2 = 0.687–0.799; R H , R 2 = 0.721–0.849). The apparent temperature sensitivity ( Q 10 ) of R R (2.69–5.16) was higher than that of R H (2.34–2.56) in all forest types. The average R H was increased by 35% following the conversion of primary forest to secondary birch forest, 31% to larch plantation and 19% to pine plantation. Such increment of R H could be explained by the increase of soil organic carbon storage in the top soil. When the primary forest was converted to secondary birch forest, the average R R significantly increased ( P < 0.05), but no significant differences in R R between primary forest and two plantations were detected ( P > 0.05). The differences in R R between secondary birch forest and primary forest and two plantations may reflect differences in small root biomass (<5 mm in diameter) at a depth of 0–40 cm and with soil microbial biomass carbon in the top soil. Our results suggest that mechanisms controlling R H and R R are probably different and that partitioning soil respiration when evaluating the effect of forest conversion on soil respiration is important. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11645563
- Volume :
- 66
- Database :
- Academic Search Index
- Journal :
- European Journal of Soil Biology
- Publication Type :
- Academic Journal
- Accession number :
- 100156038
- Full Text :
- https://doi.org/10.1016/j.ejsobi.2014.11.003