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1、High Resistant-C Proportion Of Glomalin- related Soil Protein (GRSP) Promoted Recalcitrant Soil Organic Carbon Sequestration Directly In Subtropical ForestsJing Zhang, Xuli Tang*South China Botanical Garden, Chinese Academic Sciences1. Mycorrhizae are symbiotic associations between plant roots and m
2、ycorrhizal fungi; 2. Over 80% of tropical plants form arbuscular mycorrhizae (AM) with fungi; 3. Plants allocated 8-17% even up to 45% photosynthate to AM.mycorrhizaeHyphae2rootsWhether mycorrhizae promoted soil organic carbon is controversial.Plants allocated a considerable photosynthate to AMAM tu
3、rnover fast (5-7 days )3Physical protectionBSAGRSPCarboxyl CAromatic CSchindler et al. 2007; Soil Biology Journal of EcologyHypothesis: Rich proportion of recalcitrant chemical structure of GRSP is important for SOC sequestration.4Study siteSuccessional seriesPFMFMEBFPF: the young forest, pine fores
4、t MF: secondary forest, mixed pine and monsoon evergreen broadleaved forest MEBF: primary forest, monsoon evergreen broadleaved forestLocated in Dinghushan Biosphere reserve (23o10N, 112o32E) in southern China5The monsoon evergreen broadleaved forest accumulated soil organic carbon at the rate of 61
5、 g m-2 year-1 The monsoon evergreen broadleaved forest accumulated soil organic carbon resulted from the accumulated of non-readily oxidizable organic carbon (NROC).Zhou et al. 2006; ScienceChen et al. 2015; Journal of Plant Ecology6Forest TypeEctomycorrhizal Plants (EM)Arbuscular mycorrhizal plants
6、 (AMF)Specie sNumber/ haDBH/cmHeight/m SpeciesNumber/ haDBH/cmHeight/m PF338021.08.76.72.52130653.01.93.81.6MF668716.19.89.73.94122854.65.44.83.5MEBF1046110.715.37.85.95745973.24.14.22.7Primary forestPlanted forestThe monsoon evergreen broadleaved forest (60%) allocated more carbon to belowgroud tha
7、n the young forest (45%).Tang et al. 2011; Plant EcologyZheng et al. 2013; Ecology and Environmental SciencesAM is the dominant mycorrhizal type in subtropical forests; AMF plants in MEBF are higher than in MF and PF. 7Scientific questions1.Does GRSP has a higher contribution to SOC in MEBF and MF t
8、han PF?2. Are the carbon functional group of GRSP and of SOC different among forests?3.Is recalcitrant C component ratio of GRSP higher than that of SOC? Net primary production (NPP) allocated to mycorrhizal fungi correlated with relative belowground allocation in culture studies (n=37, r2=0.55， PPFMEBF; RISOC: MEBFPFMF) combined with the GRSP/SOC ratios (PFMFMEBF) implied that GRSP is more important in young and secondary forests than in the primary forest. 16Thank you for your attention!
