The variation of fuel loads after a fire for three forest types, phododendron -Larix gmetinii forest, herb--Larix gmelinii forest and herb--Betula plalyphlla forest , in the northern forest area of Daxing’anling regi...The variation of fuel loads after a fire for three forest types, phododendron -Larix gmetinii forest, herb--Larix gmelinii forest and herb--Betula plalyphlla forest , in the northern forest area of Daxing’anling region was discussed. The dynamic models were developed by gray theory for estimating the fuels loads of arbor- shrub, herbs’ grass, litter, and semi-decomposed litter, inflamma ble fuel and the total fuels in each forest type. After a fire, the inflammabIe fuel loads in phododendron-- Larix gmelinii forest and in the herb- - Betula platyphlla fores was estimated at 10.958 t/hm2and 10.473 t/hm2 respectively’ by 13 years later. and that was 12.297 t/hm 2 in herb--Larix gmeliniiforest by 7 years later.. It was predicated that a big fire may occur after 10 years based on inflammable fuel biomass accumulated.展开更多
The main characteristics of energy environment, energy products, primary productivity and basic process ofenergy flow for three-hardwood forest(Juglans mandshurica, Fraxinus mandshurica, and Phellodendron amurense) we...The main characteristics of energy environment, energy products, primary productivity and basic process ofenergy flow for three-hardwood forest(Juglans mandshurica, Fraxinus mandshurica, and Phellodendron amurense) werestudied. The research was mainly hased on the thcory and method of community energetics, dealing with fixed position,quantitative test and expcrimental analysis. The time-space dynamics of sun-radiation in three-hardwood forest were measured and the energy compartment model was set up. his rescarch work provided a scientitic basis for the exploitation, utilization and management of three-hardtwood forest.展开更多
The secondary succession of natural Korean pine(Pinus koraiensis ) forests in Fenglin Nature Reserv, located at northem section of south slope of Xiaoxing’an Mountains, Heilongjiang, wasinvestigated . The currat fore...The secondary succession of natural Korean pine(Pinus koraiensis ) forests in Fenglin Nature Reserv, located at northem section of south slope of Xiaoxing’an Mountains, Heilongjiang, wasinvestigated . The currat forest types are ropreseded by broadleaved mixed forests dominated bywhite birch (Betula platyphylla ) and broadleaved-coniferous mixed forest dominated by larch(Larix gmelini). The secondary forests developed after a fire in 1931. Studied results showed that conderousspecies and hardwod species could replace the pioneer species together and the secondary forestscould reach the climax community without passing the hard broadleaved Stage. As the pioneer speciesfor replacing Korean pine, the oak forest was faster, the following was white birch forest, and the lastwas lawh-white birch fotal. For replacing spruce, the white birch forest and larch-white birch foresthad best results and the following was poplar forest and oak forest. White birch forest and larch-whitebirch forest had best result in replacing fir forest.展开更多
Based on the fire statistics, the Daxing'anling forest area were classified into three fire cycle regions: northern coniferous virgin forest region with a fire cycle of 110-120 years, middle conifer--broad-leaved ...Based on the fire statistics, the Daxing'anling forest area were classified into three fire cycle regions: northern coniferous virgin forest region with a fire cycle of 110-120 years, middle conifer--broad-leaved mixed forest region with a fire cycle of 30-40 years, and southem broad-leaved secontw forest region with a fire cycle of 15-20. The percentage of conifers and broad-leaved trees, for est age and natural mature period of main tree species in different fire cycle regions were discussed in concem with fire occurrence. The characteristics of fire adaptation and fire resisboce of main tree species, such as sexual and asexual reproduction, were discussed and evaluation of the synthetical fire adaptation was made.展开更多
文摘The variation of fuel loads after a fire for three forest types, phododendron -Larix gmetinii forest, herb--Larix gmelinii forest and herb--Betula plalyphlla forest , in the northern forest area of Daxing’anling region was discussed. The dynamic models were developed by gray theory for estimating the fuels loads of arbor- shrub, herbs’ grass, litter, and semi-decomposed litter, inflamma ble fuel and the total fuels in each forest type. After a fire, the inflammabIe fuel loads in phododendron-- Larix gmelinii forest and in the herb- - Betula platyphlla fores was estimated at 10.958 t/hm2and 10.473 t/hm2 respectively’ by 13 years later. and that was 12.297 t/hm 2 in herb--Larix gmeliniiforest by 7 years later.. It was predicated that a big fire may occur after 10 years based on inflammable fuel biomass accumulated.
文摘The main characteristics of energy environment, energy products, primary productivity and basic process ofenergy flow for three-hardwood forest(Juglans mandshurica, Fraxinus mandshurica, and Phellodendron amurense) werestudied. The research was mainly hased on the thcory and method of community energetics, dealing with fixed position,quantitative test and expcrimental analysis. The time-space dynamics of sun-radiation in three-hardwood forest were measured and the energy compartment model was set up. his rescarch work provided a scientitic basis for the exploitation, utilization and management of three-hardtwood forest.
文摘The secondary succession of natural Korean pine(Pinus koraiensis ) forests in Fenglin Nature Reserv, located at northem section of south slope of Xiaoxing’an Mountains, Heilongjiang, wasinvestigated . The currat forest types are ropreseded by broadleaved mixed forests dominated bywhite birch (Betula platyphylla ) and broadleaved-coniferous mixed forest dominated by larch(Larix gmelini). The secondary forests developed after a fire in 1931. Studied results showed that conderousspecies and hardwod species could replace the pioneer species together and the secondary forestscould reach the climax community without passing the hard broadleaved Stage. As the pioneer speciesfor replacing Korean pine, the oak forest was faster, the following was white birch forest, and the lastwas lawh-white birch fotal. For replacing spruce, the white birch forest and larch-white birch foresthad best results and the following was poplar forest and oak forest. White birch forest and larch-whitebirch forest had best result in replacing fir forest.
文摘Based on the fire statistics, the Daxing'anling forest area were classified into three fire cycle regions: northern coniferous virgin forest region with a fire cycle of 110-120 years, middle conifer--broad-leaved mixed forest region with a fire cycle of 30-40 years, and southem broad-leaved secontw forest region with a fire cycle of 15-20. The percentage of conifers and broad-leaved trees, for est age and natural mature period of main tree species in different fire cycle regions were discussed in concem with fire occurrence. The characteristics of fire adaptation and fire resisboce of main tree species, such as sexual and asexual reproduction, were discussed and evaluation of the synthetical fire adaptation was made.
