Ecosystem Productivity

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Productivity and the Carbon Cycle

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Presentation transcript:

Ecosystem Productivity Landscape Ecology Eli R. Perez eli.perez@asu.edu

Ecosystem Productivity Scaling up ecosystem productivity from patch to landscape: a case study of Changbai Mountain Nature Reserve, China Na Zhang, Zhenliang Yu, Guirui Yu, Jianguo Wu Vegetation productivity consequences of human settlement growth in the eastern United States Tingting Zhao, Daniel G. Brown, Hongliang Fang, David M. Theobald, Ting Liu, Tao Zhang

Scaling up ecosystem productivity from patch to landscape: a case study of Changbai Mountain Nature Reserve, China Spatially Explicit Models. Landscape heterogeneity Sophisticated in treating spatial heterogeneity Ecosystem processes Patch or stand level. Logical and biogecheomical mechanisms. Simultaneously

Scaling up ecosystem productivity from patch to landscape: a case study of Changbai Mountain Nature Reserve, China Net Primary Productivity (NPP) Quantifying carbón sinks and sources. Consequences of land use and global climate change. Multi-scaled forest landscape productivity model (FLPM). Changbai Mountain Nature Reserve (CMNR).

Scaling up ecosystem productivity from patch to landscape: a case study of Changbai Mountain Nature Reserve, China Objective: Quantify the spatial pattern of ecosystem productivity and assess the carbon source-sink relationship at the landscape level.

Multi-scaled forest landscape productivity model (FLPM). Based on Boreal Ecosystem Productivity Simulator (BEPS). Four submodels: (1) the energy transfer submodel (LAI and leaf irradiance). (2) the physiological regulation submodel (Stomatal Conductance and Total Conductance) (3) the water cycle submodel (ppt, snow melt, all ET, surface runoff) (4) the carbon cycle submodel (light use, GPP, Rh, Ra, carbon allocation, NPP, NEP) Inputs: Initial Site conditions. Driving variables. Auxiliary variables.

Results

Results

Conclusions CMNR as a whole is a net sink. Entire landscape 0.689 kg C m-2 yr-1. Highest NPP  mixed borad-leaved and Korean pine forest 1.084 kg C m-2 yr-1. Simulated NPP agreed with field measurements.

Vegetation productivity consequences of human settlement growth in the eastern United States Terrestrial ecosystems play an important role in carbon capture. Carbon regulatory function is influenced by human land- use and management activities. Impacts of human settlement growth on vegetation carbon uptake for the eastern United States during the 1992/1993–2001 time period. Changes in density of housing units. Vegetation carbon uptake was measured as gross primary production (GPP) based on the light-use efficiency (LUE) approach applied to satellite imagery

Vegetation productivity consequences of human settlement growth in the eastern United States Density  housing-unit density (HUD) derived at the scale of U.S. census blocks. The changes in settlement density between 1990 and 2000 were derived by overlaying maps of settlement densities in these two separate years. LUE model to estimate annual GPP.

Conclusions Average GPP increased from 1992/1993 to 2001. Changes in GPP varied significantly by different type of settlement growth: Exurbanization  Increase in GPP. Suburbanization  Decrease in GPP. Urban and rural slight increase.

Questions What can explain the decrease or increase on GPP in different land cover types? What factors control NPP in different ecosystems? What is the difference between NEP and NPP?