SPATIAL VARIABILITY OF FOREST FLOOR PROPERTIES IN POST-FIRE LARCH FORESTS OF THE RUSSIAN FAR EAST

А. V. Ivanov¹*, S. V. Bryanin¹, E. S. Susloparova¹, Yu. A. Masyutina¹, A. V. Danilov¹,  A. V. Kondratova¹, A. E. Mazhara²

 

¹Institute of Geology and Nature Management, Far Eastern Branch of the Russian Academy of Sciences

Relyochny Lane 1, Blagoveshchensk 675000, Russian Federation

²Far East Forestry Research Institute, Volochaevskaya St, 71, Khabarovsk, 680020, Russian Federation

 *E-mail: aleksandrgg86@mail.ru

Received: 30.10.2025

Revised: 12.02.2026

Accepted: 19.02.2026

The study summarizes and analyzes data on forest litter properties in the larch forests of the Russian Far East, which are subject to frequent fire disturbances. Based on a representative database, spatial variability patterns of the key litter properties were described. The research was conducted on 125 sample plots across the Amur Region, Transbaikal Territory, and Yakutia, considering the fire factor. The results revealed significant variability in litter stocks (Cv = 66.4%), whereas carbon and nitrogen contents proved to be more conservative indicators (Cv = 11.5% and 19.5%, respectively). It was established that litter carbon stocks in the studied disturbed forests are comparable to the carbon stocks in the aboveground tree biomass, averaging 8.3±0.5 t C ha^-1 in the Amur Region, 10.4±1.1 t C ha^-1 in Yakutia, and 4.6±0.4 t C ha^-1 in Transbaikal, which exceeds the values reported in the national database. Analysis of variance (ANOVA) identified statistically significant differences in litter stocks between the regions, reflecting climatic gradients. A regression model for litter stock was developed using “elevation” and “foliage carbon stock” as predictors (R² = 0.40). Meanwhile, fire characteristics, such as the differenced Normalized Burn Ratio (dNBR) and time since the last fire, showed no significant direct effect on litter stock. This lack of correlation may be attributed to the complexity of fire-induced processes in permafrost conditions and the inherent limitations of remote sensing assessment techniques.

 Keywords: forest litter, larch forests, stock, forest fires, Far East

 REFERENCES

Abaimov A. P., Prokushkin S. G., Sukhovol’skii V. G., Ovchinnikova T. M., Otsenka i prognoz poslepozharnogo sostoyaniya listvennitsy Gmelina na merzlotnykh pochvakh Srednei Sibiri (Assessment and forecast of the post-fire state of Gmelin larch on permafrost soils of Central Siberia), Lesovedenie, 2004, No 2, pp. 3–11.

Chestnykh O. V., Lyzhin V. A., Koksharova A. V., Zapasy ugleroda v podstilkakh lesov Rossii (Carbon stocks in the litters of Russian forests), Lesovedenie, 2007, No 6, pp. 114–121.

Crawford C., Roy D., Arab S., Barnes C., Vermote E., … & Zahn S., The 50-year Landsat collection 2 archive, Science of Remote Sensing, 2023, Vol. 8, Article 100103, DOI: 10.1016/j.srs.2023.100103

Digital Soil Map of the World and derived soil properties (Version 3.6), FAO Land and Water Development Division, FAO, 2003.

Domke G. M., Perry C. H., Walters B. F., Woodall C. W., Russell M. B., Smith J. E., Estimating litter carbon stocks on forest land in the United States, Science of The Total Environment, 2016, Vol. 557, pp. 469–478.

Ficken C. D., Wright J. P., Effects of fire frequency on litter decomposition as mediated by changes to litter chemistry and soil environmental conditions, PLoS One, 2017, Vol. 12, No 10, Article e0186292.

Ivanov A. V. Forest litter in the Far East of Russia. Figshare. Dataset. 2025. https://doi.org/10.6084/m9.figshare.30422950.v1 (2026, 1 February)

Ivanov A. V., Neumann M., Darman G. F., Danilov A. V., Susloparova E. S., Solovyov I. D., Kravchenko O. M., Smuskina I. N., Bryanin S., Vulnerability of larch forests to forest fires along a latitudinal gradient in Eastern Siberia, Canadian Journal of Forest Research, 2022, Vol. 52, pp. 1543–1552.

Ivanov A. V., Zamolodchikov D. G., Ivanova E. V., Novye otsenki elementov uglerodnogo tsikla dlya poimennykh lesov yuzhnogo Primor’ya (New estimates of carbon cycle elements for floodplain forests of southern Primorye), Agrarnyi vestnik Primor’ya, 2023, No 2 (30), pp. 63–67.

Ivanov A. V., Zapasy lesnykh podstilok v kedrovo-shirokolistvennykh lesakh yuzhnogo Sikhote-Alinya (Forest litter stocks in cedar-broadleaf forests of southern Sikhote-Alin), Sibirskii lesnoi zhurnal, 2015, No 5, pp. 87–95.

Ivanov A., Masyutina Y., Susloparova E., Danilov A., Zenevskaya E., Bryanin S., Effect of fire on aboveground carbon pools dynamic in the boreal forests of Eastern Eurasia: Analysis of field and remote data, Forests, 2024, Vol. 15, No 1448, DOI: 10.3390/f15081448

Key C. H., Benson N. C., Landscape Assessment (LA) Sampling and Analysis Methods. In: USDA Forest Service General Technical Report RMRS-GTR, USDA: Washington, DC, USA, 2006, 55 p.

Kharuk V. I., Ponomarev E. I., Spatiotemporal characteristics of wildfire frequency and relative area burned in larch-dominated forests of Central Siberia, Russian Journal of Ecology, 2017, Vol. 48, pp. 507–512.

Kharuk V. I., Shvetsov E. G., Buryak L. V., Golyukov A. S., Dvinskaya M. L., Petrov I. A., Wildfires in the Larch Range within Permafrost, Siberia, Fire, 2023, Vol. 6, No 8, p. 301, DOI: 10.3390/fire6080301

Nave L. E., Vance E. D., Swanston C. W., Curtis P. S., Fire effects on temperate forest soil C and N storage, Ecological Applications, 2011, Vol. 21, No 4, pp. 1189–1201, DOI: 10.1890/10-0660.1

Ponomarev E. I., Zabrodin A. N., Shvetsov E. G., Ponomareva T. V., Wildfire intensity and fire emissions in Siberia, Fire, 2023, Vol. 6, No 7, p. 246, DOI: 10.3390/fire6070246

Prokushkin S. G., Abaimov A. P., Prokushkin A. S., Masyagina O. V., Biomassa napochvennogo pokrova i podleska v listvennichnykh lesakh kriolitozony srednei Sibiri (Biomass of ground cover and understorey in larch forests of the cryolithozone of Central Siberia), Sibirskii ekologicheskii zhurnal, 2006, Vol. 13, No 2, pp. 131–139.

Rukovodyashchie ukazaniya po effektivnoi praktike dlya zemlepol’zovaniya, izmenenii v zemlepol’zovanii i lesnogo khozyaistva (Good Practice Guidance for Land Use, Land-Use Change and Forestry), Programma MGEIK po natsional’nym kadastram parnikovykh gazov, MGEIK, 2003, 648 p.

Sergeeva O. V., Mukhortova L. V., Krivobokov L. V., Raspredelenie zapasov podstilki i biomassy zhivogo napochvennogo pokrova v severnoi taige Tsentral’noi Evenkii v zavisimosti ot rel’efa (Distribution of litter stocks and biomass of live ground cover in the northern taiga of Central Evenkia depending on topography), Sibirskii lesnoi zhurnal, 2020, No 1, pp. 38–46.

Shirov A. A., Sozdanie sistemy monitoringa i prognozirovaniya vyброsov klimaticheski aktivnykh veshchestv v interesakh modernizatsii i razvitiya ekonomiki Rossii (Creation of a system for monitoring and forecasting emissions of climate-active substances in the interests of modernization and development of the Russian economy), Problemy prognozirovaniya, 2023, No 6, pp. 11–24.

Usol’tsev V. A., Fitomassa model’nykh derev’ev dlya distantsionnoi i nazemnoi taksatsii lesov Evrazii (Phytomass of model trees for remote and ground forest inventory in Eurasia), Yekaterinburg: Ural. gos. lesotekhn. un-t, 2016.

Utkin A. I., Zamolodchikov D. G., Chestnykh O. V., Organicheskii uglerod listvennichnykh lesov Rossii (Organic carbon in larch forests of Russia), Khvoinye boreal’noi zony, 2003, Vol. 21, No 1, pp. 66–76.

Zabrodin A. N., Ponomarev E. I., Otsenka svyazi mezhdu stepen’yu pozharnogo vozdeistviya na rastitel’nost’ i moshchnost’yu teploizlucheniya ot pozhara (Assessment of the relationship between the degree of fire impact on vegetation and the intensity of thermal radiation from fire), Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No 5, pp. 166–175.

Zamolodchikov D. G., Grabovskii V. I., Chestnykh O. V., Dinamika balansa ugleroda v lesakh federal’nykh okrugov Rossiiskoi Federatsii (Dynamics of carbon balance in the forests of federal districts of the Russian Federation), Voprosy lesnoi nauki, 2018, Vol. 1, No 1, pp. 1–24.