Abstract
During the past century, Heilongjiang Province, the highest forest coverage province of China, has experienced rapid deforestation, with coverage decreasing by an estimated 40 %. As the important role that forest vegetation plays in oxygen production and environmental optimization, dynamic change analysis of forest and forest oxygen production has become more and more important. In this study, we examined changes in forest and forest oxygen production, as well as the impact of natural and human activities on such change in Heilongjiang Province, China. In particular, the net ecosystem productivity (NEP) of the forest was generated by the C-FIX model, and the relationship between NEP and forest oxygen production was examined. Analysis results indicate that in the past century, the forest area and oxygen production of Heilongjiang Province has been reduced by about 106,667.57 km2 (37.16 %) and 56.22 million tons (33 %), respectively. Moreover, the spatial analysis results suggest significant spatial variation of forest oxygen production in Heilongjiang Province, China. Specifically, oxygen production in the southwest has shifted from the highest area to the lowest area, and significant decreases in forest oxygen production have been observed in the Sanjiang Plain and the central part of Heilongjiang Province. In addition, oxygen production also presents decreasing tendencies (>90 %) in Daqing City and Qiqihar. The analysis of the impact of climate change and human activities on forest oxygen production indicates that human activities have the largest impact on forest oxygen production, accounting for about 67.95 % of the decrease.
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