Effects of topography on simulated net primary productivity at landscape scale.

Effects of topography on simulated net primary productivity at landscape scale. Research Abstract Details 

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Effects of topography on simulated net primary productivity at landscape scale. Abstract Text:

X F Chen,J M Chen,S Q An,W M Ju,

Local topography significantly affects spatial variations of climatic variables and soil water movement in complex terrain. Therefore, the distribution and productivity of ecosystems are closely linked to topography. Using a coupled terrestrial carbon and hydrological model (BEPS-TerrainLab model), the topographic effects on the net primary productivity (NPP) are analyzed through four modelling experiments for a 5700 km(2) area in Baohe River basin, Shaanxi Province, northwest of China. The model was able to capture 81% of the variability in NPP estimated from tree rings, with a mean relative error of 3.1%. The average NPP in 2003 for the study area was 741 gCm(-2)yr(-1) from a model run including topographic effects on the distributions of climate variables and lateral flow of ground water. Topography has considerable effect on NPP, which peaks near 1350 m above the sea level. An elevation increase of 100 m above this level reduces the average annual NPP by about 25 gCm(-2). The terrain aspect gives rise to a NPP change of 5% for forests located below 1900 m as a result of its influence on incident solar radiation. For the whole study area, a simulation totally excluding topographic effects on the distributions of climatic variables and ground water movement overestimated the average NPP by 5%.

Effects of topography on simulated net primary productivity at landscape scale. Publishing Authors By Initials

XF Chen,JM Chen,SQ An,WM Ju,

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Effects of topography on simulated net primary productivity at landscape scale. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of environmental management

VOLUME: 85

Page Numbers: 585-96

Journal Abbreviation: J. Environ. Manage.

ISSN: 0301-4797

DAY: 20

MONTH: 12

YEAR: 2006

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LANGUAGE: eng

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AFFILIATION: International Institute of Earth System Science, Nanjing University, Nanjing 210093, China.

Country: England

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MEDLINETA: J Environ Manage

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