Temporal and spatial variations and influencing factors of gross primary productivity in Changbai Mountain Nature Reserve, China

doi:10.13287/j.1001-9332.202305.026

Abstract

Abstract: Changbai Mountain Nature Reserve (CNR) is a typical temperate forest ecosystem, and gross primary production (GPP) of which is closely related to topography and climate change. Research on the spatio-temporal variations and influencing factors of GPP in the CNR is of great significance for assessing growth status of vegetation and the quality of ecological environment. We calculated GPP in CNR using the vegetation photosynthesis model (VPM), and analyzed the influences of slope, altitude, temperature, precipitation, and total radiation. The results showed that the range of annual average GPP in CNR was 63-1706 g C·m^-2·a^-1 from 2000 to 2020 and that GPP decreased with the increases of altitude. Temperature played the most important role in driving the spatial varia-tion of GPP, with a significant positive correlation with GPP. During the study period, the overall annual GPP showed a significant increase trend in CNR, with an average annual increase of 13 g C·m^-2·a^-1. The areas with increase of annual GPP accounted for 79.9% of the total area, and the area proportion of annual GPP increase differed in each plant functional type. Annual precipitation was significantly negatively correlated with GPP in 43.2% of CNR, while annual mean temperature and annual total radiation were significantly positively correlated with GPP in 47.2% and 82.4% of CNR. GPP would increase continuously in CNR under the scenario of future global warming.

Key words: gross primary production (GPP), vegetation photosynthesis model (VPM), Changbai Mountain Nature Reserve, climate change

LI Chunbo, ZHANG Yuan, LIU Yage, WU Jiabing, WANG Anzhi. Temporal and spatial variations and influencing factors of gross primary productivity in Changbai Mountain Nature Reserve, China[J]. Chinese Journal of Applied Ecology, 2023, 34(5): 1341-1348.

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