Publikācijas

Lazdiņš A., Petaja G., Bārdule A., Polmanis K., Kalēja S., Maliarenko O., Melnik N. 2024. Forests, 15(9), 1500
Fine Roots in Hemiboreal Forest Stands and Clearcut Areas with Nutrient-Rich Organic Soils in Latvia: Morphological Traits, Production and Carbon Input
DOI: 10.3390/f15091500
Skranda I., Purvina D., Bardule A., Petaja G. 2024. International Scientific Conference "Engineering for Rural Development 2024", Jelgava, Latvia, 22-24.05.2024., 793-799
Methane (CH4) and nitrous oxide (N2O) emissions from surface of deciduous tree stems and soil in forests with drained and naturally wet organic soils
DOI: 10.22616/ERDev.2024.23.TF155
Petaja G., Purvina D., Bardule A., Zvaigzne Z.A. 2024. International Scientific Conference "Engineering for Rural Development 2024", Jelgava, Latvia, 22-24.05.2024., 780-787
CH4 and N2O emissions from surface of deciduous tree stems in forests with drained and naturally wet mineral soils
DOI: 10.22616/ERDev.2024.23.TF151
Petaja G., Ivbule I., Zvaigzne Z.A., Purviņa D., Upenieks E.M., Līcīte I., Lazdiņš A. 2024. Environments, 11(4), 73
Organic Carbon Stock in Mineral Soils in Cropland and Grassland in Latvia
DOI: 10.3390/environments11040073
Purviņa D., Zvaigzne Z.A., Skranda I., Meļņiks R.N., Petaja G., Līcīte I., Butlers A., Bārdule A. 2024. Agriculture, 14(3), 387
Impact of Soil Organic Layer Thickness on Soil-to-Atmosphere GHG Fluxes in Grassland in Latvia
DOI: 10.3390/agriculture14030387
Meļņiks R.N., Bārdule A., Butlers A., Champion J., Kalēja S., Skranda I., Petaja G., Lazdiņš A. 2023. Land, 12(12), 2153
Carbon Losses from Topsoil in Abandoned Peat Extraction Sites Due to Ground Subsidence and Erosion
DOI: 10.3390/land12122153
Petaja G., Bārdule A., Zalmanis J., Lazdiņa D., Daugaviete M., Skranda I., Zvaigzne Z.A., Purviņa D. 2023. Plants, 12(12), 2264
Changes in Organic Carbon Stock in Soil and Whole Tree Biomass in Afforested Areas in Latvia
DOI: 10.3390/plants12122264
Petaja G., Ancāns R., Bārdule A., Spalva G., Meļņiks R.N., Purviņa D., Lazdiņš A. 2023. Forests, 14(3), 521
Carbon Dioxide, Methane and Nitrous Oxide Fluxes from Tree Stems in Silver Birch and Black Alder Stands with Drained and Naturally Wet Peat Soils
DOI: 10.3390/f14030521
Petaja G., Krumsteds L., Zvaigzne Z. 2022. Proceedings of 28th Annual International Scientific Conference "Research for Rural Development 2022", 37, 70-76
Short-term impact of fertilization on ground vegetation in deciduous forest stands and tree plantation
DOI: 10.22616/rrd.28.2022.010
Bārdule A., Petaja G., Butlers A., Purviņa D., Lazdiņš A. 2021. Baltic Forestry, 27(2), 534
Estimation of litter input in hemiboreal forests with drained organic soils for improvement of GHG inventories
DOI: 10.46490/BF534
Petaja G., Polmanis K., Krumšteds L. 2021. Proceedings of the 10th International Scientific Conference “Rural Development 2021: Challenges for Sustainable Bioeconomy and Climate Change”, 21-23 September 2021, 265-270
Impact of litter turnover on carbon cycling in forests with drained and naturally wet nutrient-rich organic soils in Latvia
DOI: 10.15544/RD.2021.047
Petaja G., Karklina I., Neimane S. 2021. Proceedings of 27th International Scientific Conference "Research for Rural Development 2021", 36, 57-62
Short-term effects of fertilization on photosynthetic activity in a deciduous tree plantation
DOI: 10.22616/rrd.27.2021.008
Petaja G., Kārkliņa I., Zvaigzne Z. 2019. Proceedings of 10th International Conference on Biodiversity Research, 38, ISBN 978-9984-14-872-4
Short-term impact of nitrogen fertilizer and wood ash on forest ground vegetation
Petaja G., Okmanis M., Polmanis K., Stola J., Spalva G., Jansons J. 2018. Agronomy Research, 16(4), 1809-1823
Evaluation of greenhouse gas emissions and area of organic soils in cropland and grassland in Latvia – integrated National forest inventory data and soil maps approach
DOI: 10.15159/ar.18.183
Petaja G., Okmanis M., Makovskis K., Lazdiņa D., Lazdiņš A. 2018. Baltic Forestry, 24(1), 9-16
Forest fertilization: economic effect and impact on GHG emissions in Latvia
Petaja G., Kaleja S., Zimelis A., Lazdins A. 2018. Proceedings of 17th International Scientific Conference "Engineering for Rural Development", 17, 1366-1371
Comparison of productivity of standard and accumulating forwarder grapple in thinning
DOI: 10.22616/ERDev2018.17.N143
Kalēja S., Petaja G., Zimelis A., Puzuls K. 2018. Proceedings of 17th International Scientific Conference "Engineering for Rural Development", 17, 1384-1389
Increase of forwarding productivity and reduction of tree damages in thinning by use of loading grapple with tilt function
DOI: 10.22616/ERDev2018.17.N148
Okmanis M., Petaja G., Lupiķis A. 2017. Starptautiskās zinātniski praktiskās konferences "Zinātne un prakse nozares attīstībai" tēzes, 35-36
Koksnes pelnu mehanizētas izkliedes izmaksu un darba ražības novērtējums
Okmanis M., Petaja G., Lupiķis A. 2017. Proceedings of 23th International Scientific Conference "Research for Rural Development 2017", 1, 62-68
Productivity of mechanized wood ash application in forest
DOI: 10.22616/rrd.23.2017.009
Petaja G., Lupiķis A., Lazdiņš A. 2017. Proceedings of 23th International Scientific Conference "Research for Rural Development 2017", 1, 47-54
Changes in forest floor and tree vegetation in the level II monitoring plot in Valgunde Parish
DOI: 10.22616/rrd.23.2017.007