Dynamic changes of vegetation net primary productivity in permafrost zone of Northeast China in 1982-2009 in response to global change

As one of the high-latitude cold regions, the permafrost zone of Northeast China (PZNC) is more sensitive to global change. Based on the AVHRR GIMMS NDVI and MODIS NDVI, and by using CASA model, this paper simulated the net primary productivity (NPP) in the PZNC from 1982 to 2009. In 1982-2009, the...

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Bibliographic Details
Published inYing yong sheng tai xue bao Vol. 23; no. 6; p. 1511
Main Authors Mao, De-Hua, Wang, Zong-Ming, Luo, Ling, Han, Ji-Xing
Format Journal Article
LanguageChinese
Published China 01.06.2012
Subjects
China
Climate Change
Cold Climate
Ecosystem
Models, Theoretical
Plant Development
Poaceae - growth & development
Trees - growth & development
China
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Summary:As one of the high-latitude cold regions, the permafrost zone of Northeast China (PZNC) is more sensitive to global change. Based on the AVHRR GIMMS NDVI and MODIS NDVI, and by using CASA model, this paper simulated the net primary productivity (NPP) in the PZNC from 1982 to 2009. In 1982-2009, the mean annual air temperature, annual solar radiation and sunshine duration, and atmospheric CO2 concentration and its annual increasing rate in the PZNC increased significantly while the annual precipitation had a significant decrease, and the annual NPP showed an up-and-down trend, with the turning point in 1998. The annual NPP had a high spatial heterogeneity, with an average of 623 g C X m(-2). Comparing with air temperature, the precipitation in growth season was the main factor affecting the NPP. Land use change altered land cover, and thus, the spatiotemporal characteristics of NPP. A significant positive correlation was observed between the NPP and atmospheric CO2 concentration. The impact of permafrost degra
ISSN:1001-9332