林分斑块尺度下的森林群落碳汇研究

针对森林碳循环过程模型空间模拟尺度多样化,但数据获取比较困难,森林碳变化响应与适应的研究不可能实现在不同生境下均安置碳通量观测系统的问题,提出利用遥感过程耦合模型定量估算动态 GPP 值、NPP 值、RH 值及 NEP 值等,反演森林植被群落不同优势树种碳汇/ 碳源情况,探寻造林、森林转化和森林人工经营管理等植被恢复措施对森林碳增汇的生态价值,激活碳源效应的促进重建作用。 通过以空间代替时间的实地调查采样法和遥感模型相结合,输入 GLOPEM-CEVSA 模型中温度影响系数、蒸散量、水气压影响系数、二氧化碳浓度胁迫、植物呼吸及土壤呼吸等驱动因子,研究在林分斑块尺度下森林碳储量差异。 研究表明:(1)从整体情况来看,林地净初级生产力>草地>农业用地>水域>建设用地,林地净生态系统生产力>农业用地>草地>建设用地>水域;(2)从年际 NPP / NEP 值来看,森林生态系统大部分表现为大气 CO2 碳汇;(3)森林群落自然恢复演替中 NPP 值大小关系是:乔幼落叶阔叶林群落(A4)>马尾松/ 杉木常绿针叶林群落(A5)>柏木常绿针叶林群落(A6) >常绿灌丛/ 灌草丛/人工灌木群落(A2) >草本群落(A1);NEP 值表现为乔幼落叶阔叶林群落>马尾松/ 杉木常绿针叶林群落>常绿灌丛/ 灌草丛/ 人工灌木群落>柏木常绿针叶林群落>草本群落;人工辅助演替中 NPP 值大小关系是(慈竹)竹林群落>马尾松/ 杉木常绿针叶林群落>柏木常绿针叶林群落>常绿灌丛/ 灌草丛/ 人工灌木群落;NEP 值表现为(慈竹)竹林群落>马尾松/ 杉木常绿针叶林群落>常绿灌丛/ 灌草丛/ 人工灌木群落>柏木常绿针叶林群落,NPP 值和 NEP 值随顺行演替均呈现出先上升后下降的单峰状发展趋势。

Carbon Sinks of Forest Community at the Forest Patch Scale

The spatial simulation scale of forest carbon cycle process models is diverse but the data acquisition is difficult.It is impossible to install a carbon flux observation system in different environments in the study of forest carbon changeresponse and adaptation. In this paper the remote sensing process coupling model was proposed to quantitatively estimatethe dynamic GPP value NPP value RH value and NEP value to invert the carbon sink / carbon source situation ofdifferent dominant tree species of forest vegetation community to explore the ecological value of vegetation restorationmeasures such as afforestation forest transformation and forest artificial management and to activate the reconstructioneffect of carbon source effect. Through the combination of field survey sampling method with space instead of time and remote sensing model the driving factors of temperature influence coefficient evapotranspiration water-pressure influencecoefficient carbon dioxide concentration stress plant respiration and soil respiration in GLOPEM-CEVSA model wereinput to study the differences of forest carbon storages at the forest patch scale. The research showed that 1 in thepicture as a whole Net Primary Productivity of Woodland>Grassland>Agricultural Land>Water Area>Construction Land Net Ecosystem Productivity of Woodland >Agricultural Land >Grassland >Construction land >Water Area 2 from theinter-annual NPP / NEP values most forest ecosystems showed atmospheric CO2carbon sink 3 the relationship of NPPvalues in the natural restoration succession of forest community was Deciduous Broad-Leaved Forest Community A4 >Pinus Massoniana / Cunninghamia Lanceolata Evergreen Coniferous Forest Community A5 >Cypress Evergreen ConiferousForest Community A6 >Evergreen Shrub / Shrub Grass/ Artificial Shrub Community A2 >Herbaceous Community A1 NEP values were as follows Deciduous Broad-Leaved Forest Community > Pinus Massoniana / Cunninghamia LanceolataEvergreen Coniferous Forest Community >Evergreen Shrub / Shrub Grass/ Artificial Shrub Community >Cypress EvergreenConiferous Forest Community>Herbaceous Community the relationship of NPP values in artificial assisted succession wasas follows Bamboo Forest Community > Pinus Massoniana / Cunninghamia Lanceolata Evergreen Coniferous ForestCommunity>Cypress Evergreen Coniferous Forest Community>Evergreen Shrub / Shrub Grass/ Artificial Shrub Community NEP values were as follows Bamboo Forest Community>Pinus Massoniana / Cunninghamia Lanceolata Evergreen ConiferousForest Community > Evergreen Shrub / Shrub Grass/ Artificial Shrub Community > Cypress Evergreen Coniferous ForestCommunity and both the NPP values and the NEP values showed a unimodal development trend of rising first and thendecreasing with the sequential succession.