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Net Primary Production of Forest Vegetal Biomass in Kyiv Region

Vasylyshyn Roman, Lakyda Іvan, Lakyda Мaryna, Blyshchyk Volodymyr

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 1

38--45

Net primary production (NPP) is considered by the world scientific community as an important indicator that reflects the features of the condition and peculiarities of the functioning of forest ecosystems. It also allows quantifying the potential of forests in performing their ecosystem functions. The information basis of the research consists of data from the industrial database of the Ukrainian State Forest Management Planning Association – IA “Ukrderzhlisproekt”. The dataset contains the biometric description of stands in the study region. Also, a system of mathematical models, algorithmic support, and software for quantitative assessment of net primary production are utilized within this research. As a result, the research determines the quantitative values of the total volume and specific intensity of formation of net primary production in the forests of Kyiv region. The total volume of NPP in the forests of the region exceeds 6.5 million tons of dry matter, of which 56% is accounted for by forests dominated by Scots pine. The highest mean values of primary production per unit area are observed in stands composed of tree species belonging to the hardwood broadleaved species group (black locust, hornbeam, European ash, and common oak, 1550–1910 g·m-2. The highest intensity of organic matter production is observed in the stands of V to VIII age classes. Highly productive stands generate a major part of forest NPP in the study region. Among forest types, the highest intensity of the bioproduction process is observed in fresh hornbeam-oak and fresh hornbeam-oak site types – 1872 g·m-2 and 1646 g·m-2, respectively. The forests subordinated to the State Agency of Forest Resources of Ukraine concentrate the largest volumes of annually formed organic matter. The lowest productivity is typical for forest plant communities under the control of the Ministry of Defense of Ukraine. The research results will serve as an informational basis applicable to the formation of a strategy for sustainable use of ecosystem functions of the forests in the study region.

Forecasting carbon budget under climate change and CO2 fertilization for subtropical region in China using Integrated Biosphere Simulator (IBIS) model

Zhu Q., Jiang H., Liu J., Peng C., Fang X., Yu S., Zhou G., Wei X., Ju W.

Polish Journal of Ecology

2011

Vol. 59, nr 1

3-23

The regional carbon budget of the climatic transition zone may be very sensitive to climate change and increasing atmospheric CO2 concentrations. This study simulated the carbon cycles under these changes using process-based ecosystem models. The Integrated Biosphere Simulator (IBIS), a Dynamic Global Vegetation Model (DGVM), was used to evaluate the impacts of climate change and CO2 fertilization on net primary production (NPP), net ecosystem production (NEP), and the vegetation structure of terrestrial ecosystems in Zhejiang province (area 101,800 km2, mainly covered by subtropical evergreen forest and warm-temperate evergreen broadleaf forest) which is located in the subtropical climate area of China. Two general circulation models (HADCM3 and CGCM3) representing four IPCC climate change scenarios (HC3AA, HC3GG, CGCM-sresa2, and CGCM-sresb1) were used as climate inputs for IBIS. Results show that simulated historical biomass and NPP are consistent with field and other modelled data, which makes the analysis of future carbon budget reliable. The results indicate that NPP over the entire Zhejiang province was about 55 Mt C yr[^-1] during the last half of the 21st century. An NPP increase of about 24 Mt C by the end of the 21st century was estimated with the combined effects of increasing CO2 and climate change. A slight NPP increase of about 5 Mt C was estimated under the climate change alone scenario. Forests in Zhejiang are currently acting as a carbon sink with an average NEP of about 2.5 Mt C yr[^-1]. NEP will increase to about 5 Mt C yr[^-1] by the end of the 21st century with the increasing atmospheric CO2concentration and climate change. However, climate change alone will reduce the forest carbon sequestration of Zhejiang.s forests. Future climate warming will substantially change the vegetation cover types; warm-temperate evergreen broadleaf forest will be gradually substituted by subtropical evergreen forest. An increasing CO2 concentration willhave little contribution to vegetation changes. Simulated NPP shows geographic patterns consistent with temperature to a certain extent, and precipitation is not the limiting factor for forest NPP in the subtropical climate conditions. There is no close relationship between the spatial pattern of NEP and climate condition.

Variability of nitrogen and phosphorus concentration and the net primary production of Vaccinium vitis-idaea L. and Vaccinium myrtillus L. in chosen woodland ecosystems of the Słowiński National Park [commun.]

Parzych A., Sobisz Z., Trojanowski J.

Archives of Environmental Protection

2010

Vol. 36, no. 2

91-104

Vaccinio uliginosi-Betuletum pubescentis and Empetro nigri-Pinetum are characteristic of their diverse frequency and density Vaccinium vitis-idaea L. and Vaccinium myrtillus L. on the forest floor. The examined berry under-shrubs show differences in content of nitrogen and phosphorous compounds and the volume of the over-ground net primary production. An average content of the examined biogenes in leaves of the bilberry (Vaccinium myrtillus) within the area of the Słowiński National Park was 1.311% N, 0.102% P and 40.8% C in Vaccinio uliginosi-Betuletum pubescentis and 1.159% N, 0.095% P and 38.7% C in Empetro nigri-Pinetum. Red bilberry leaves are thought to contain nitrogen, phosphorus and carbon in such propotions: 1.083% N, 0.097% P and 44.70% C in Vaccinio uliginosi-Betuletum pubescentis and 0.868% N, 0.085% P and 44.70% C in Empetro nigri-Pinetum. The variable concentration of nitrogen and phosphorus in sprouts of the examined species of berries shows a positive correlation of those elements. The over-ground net primary production of Vaccinium myrtillus is 534.905 kg/ha in Vaccinio uliginosi-Betuletum pubescentis and 216.594 kg/ha within the coastal crowberry coniferous forest. Vaccinium vitis-idaea in Empetro nigri-Pinetum reaches 155.283 kg/ha of over-ground net primary production and only 113.220 kg/ha in Vaccinio uliginosi-Betuletum pubescentis.

Vaccinio uliginosi-Betuletum pubescentis i Empetro nigri-Pinetum charakteryzują się zróżnicowaną frekwencja i zagęszczeniem Vaccinium vitis-idaea L. i Vaccinium myrtillus L. na dnie lasu. Badane krzewinki borówek wykazują różnice w zawartości związków azotowych i fosforowych oraz wielkości nadziemnej produkcji pierwotnej netto. Średnia zawartość badanych biogenów w liściach borówki czarnej (Vaccinium myrtillus) na terenie Słowińskiego Parku Narodowego wynosiła 1,311% N, 0,102% P i 40,8% C w Vaccinio uliginosi-Betuletum pubescentis oraz 1,159% N, 0,095% P i 38,7% C w Empetro nigri-Pinetum. Zawartość azotu, fosforu i węgla w liściach borówki brusznicy (Vaccinium vitis-idaea) wynosiła: 1,083% N, 0,097% P i 44,70% C w Vaccinio uliginosi-Betuletum pubescentis oraz 0,868% N, 0,085% P i 44,70% C w Empetro nigri-Pinetum. Zmienna koncentracja azotu i fosforu w pędach badanych gatunków borówek wykazuje dodatnią korelację tych pierwiastków. Nadziemna produkcja pierwotna netto Vaccinium myrtillus wynosi 534,905 kg/ha w Vaccinio uliginosi-Betuletum pubescentis oraz 216,594 kg/ha w nadmorskim borze bażynowym. Vaccinium vitis-idaea w Empetro nigri-Pinetum osiąga 155,283 kg/ha produkcji pierwotnej netto oraz jedynie 113,220 kg/ha w Vaccinio uliginosi-Betuletum pubescentis.