台灣主要人工林碳吸存時空變異之探討(3/3)

Objective
The purpose of this project is to develop the conversion coefficient from timber volume to biomass of 2 to 3 primary tree species for plantations and the model to estimate carbon pool of the plantations. Meanwhile, the soil carbon pool of the plantations will be calculated. The results of this project can be used to be as part of carbon sequestration database of forest resources and to assess the contributions of plantations on the storage of carbon.

Primary works
The primary tree species for plantations are selected in the southern Taiwan to investigate and analyze the carbon storage of plants and soil of the ecosystems. The primary works are as following:
1. Study on spatial and time variation of carbon storage of trees: 2-3 tree species will be selected from the primary plantations in various zones in order to estimate the carbon storage of trees, understory vegetation, and litter layer, then to build its carbon sequestration model and to evaluate the carbon storage of the stand. The primary works for each species include plots establishment and inventory, sample-trees selection and harvest, biomass measurement of sample trees, regression model establishment, carbon content analysis, and carbon sequestration estimation. Thus the growth and carbon storage of plantations will be estimated.
2. Study on spatial and time variation of soil carbon storage: the primary works include model evaluation on soil storage or carbon pool, establishment soil carbon storage database for primary tree species, analysis soil carbon storage of plantations at different ages. Then soil carbon pools are calculated by using the database of different tree species and ages of plantations.
3. Study on soil CO2 evolution of the plantations: the soil CO2 evolution to be measured by open chamber method with continuous air flow. The works include measurements on daily and season variations of soil CO2 evolution in the forest stand and soil property survey, including soil temperature, soil water content, soil nitrogen form (NH4+-N, NO3--N, and total nitrogen), soil carbon content, and soil pH.

Expecting benefits
1. To develop the conversion coefficient from timber volume to biomass of 1 to 2 primary tree species for plantations and estimate the carbon storage of its plantations.
2. To develop the soil carbon storage database of different plantations.
3. To develop the standard soil sampling and analysis procedures for soil carbon.
4. To understand total amount soil CO2 evolution of different plantations and to evaluate the effect of soil characteristics on soil CO2 evolution.