NDLI: Effect of vegetation type, wetting intensity, and nitrogen supply on external carbon stimulated heterotrophic respiration and microbial biomass carbon in forest soils

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Effect of vegetation type, wetting intensity, and nitrogen supply on external carbon stimulated heterotrophic respiration and microbial biomass carbon in forest soils

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Effect of vegetation type, wetting intensity, and nitrogen supply on external carbon stimulated heterotrophic respiration and microbial biomass carbon in forest soils

Content Provider	Springer Nature Link
Author	Wu, HaoHao Xu, XingKai Duan, CunTao Li, TuanSheng Cheng, WeiGuo
Copyright Year	2015
Abstract	By using packed soil-core incubation experiments, we have studied stimulating effects of addition of external carbon (C) (glucose, 6.4 g C m$^{−2}$) on heterotrophic respiration and microbial biomass C of a mature broadleaf and Korean pine mixed forest (BKPF) and an adjacent white birch forest (WBF) soil under different wetting intensities (55% and 80% WFPS, water-filled pore space) and nitrogen (N) supply (NH$_{4}$Cl and KNO$_{3}$, 4.5 g N m$^{−2}$) conditions. The results showed that for the control, the cumulative carbon dioxide (CO$_{2}$) flux from WBF soil during the 15-day incubation ranged from 5.44 to 5.82 g CO$_{2}$-C m$^{−2}$, which was significantly larger than that from BKPF soil (2.86 to 3.36 g CO$_{2}$-C m$^{−2}$). With increasing wetting intensity, the cumulative CO$_{2}$ flux from the control was decreased for the WBF soil, whereas an increase in the CO$_{2}$ flux was observed in the BKPF soil (P < 0.05). The addition of NH$_{4}$Cl or KNO$_{3}$ alone significantly reduced the cumulative CO$_{2}$ fluxes by 9.2%–21.6 % from the two soils, especially from WBF soil at low wetting intensity. The addition of glucose alone significantly increased soil heterotrophic respiration, microbial biomass C (MBC), and microbial metabolic quotient. The glucose-induced cumulative CO$_{2}$ fluxes and soil MBC during the incubation ranged from 8.7 to 11.7 g CO$_{2}$-C m$^{−2}$ and from 7.4 to 23.9 g C m$^{−2}$, which are larger than the dose of added C. Hence, the addition of external carbon can increase the decomposition of soil native organic C. The glucose-induced average and maximum rates of CO$_{2}$ fluxes during the incubation were significantly influenced by wetting intensity (WI) and vegetation type (VT), and by WI×VT, NH$_{4}$Cl×VT and WI×VT×NH$_{4}$Cl (P<0.05). The addition of NH$_{4}$Cl, instead of KNO$_{3}$, significantly decreased the glucose-induced MBC of WBF soil (P<0.05), whereas adding NH$_{4}$Cl and KNO$_{3}$ both significantly increased the glucose-induced MBC of BKPF soil at high moisture (P<0.05). According to the differences in soil labile C pools, MBC and CO$_{2}$ fluxes in the presence and absence of glucose, it can be concluded that the stimulating effects of glucose on soil heterotrophic respiration and MBC under temperate forests were dependent on vegetation type, soil moisture, and amount and type of the N added.
Starting Page	1446
Ending Page	1456
Page Count	11
File Format	PDF
ISSN	16747313
Journal	Science in China Series D: Earth Sciences
Volume Number	58
Issue Number	8
e-ISSN	18691897
Language	English
Publisher	Science China Press
Publisher Date	2015-04-10
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dissolved organic carbon forest soil glucose heterotrophic respiration microbial biomass carbon nitrogen supply stimulating effect Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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