Changes in Spring Phenology in the Three-Rivers Headwater Region from 1999 to 2013
AbstractVegetation phenology is considered a sensitive indicator of terrestrial ecosystem response to global climate change. We used a satellite-derived normalized difference vegetation index to investigate the spatiotemporal changes in the green-up date over the Three-Rivers Headwater Region (TRHR) from 1999 to 2013 and characterized their driving forces using climatic data sets. A significant advancement trend was observed throughout the entire study area from 1999 to 2013 with a linear tendency of 6.3 days/decade (p < 0.01); the largest advancement trend was over the Yellow River source region (8.6 days/decade, p < 0.01). Spatially, the green-up date increased from the southeast to the northwest, and the green-up date of 87.4% of pixels fell between the 130th and 150th Julian day. Additionally, about 91.5% of the study area experienced advancement in the green-up date, of which 80.2%, mainly distributed in areas of vegetation coverage increase, experienced a significant advance. Moreover, it was found that the green-up date and its trend were significantly correlated with altitude. Statistical analyses showed that a 1-°C increase in spring temperature would induce an advancement in the green-up date of 4.2 days. We suggest that the advancement of the green-up date in the TRHR might be attributable principally to warmer and wetter springs. View Full-Text
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Liu, X.; Zhu, X.; Zhu, W.; Pan, Y.; Zhang, C.; Zhang, D. Changes in Spring Phenology in the Three-Rivers Headwater Region from 1999 to 2013. Remote Sens. 2014, 6, 9130-9144.
Liu X, Zhu X, Zhu W, Pan Y, Zhang C, Zhang D. Changes in Spring Phenology in the Three-Rivers Headwater Region from 1999 to 2013. Remote Sensing. 2014; 6(9):9130-9144.Chicago/Turabian Style
Liu, Xianfeng; Zhu, Xiufang; Zhu, Wenquan; Pan, Yaozhong; Zhang, Chong; Zhang, Donghai. 2014. "Changes in Spring Phenology in the Three-Rivers Headwater Region from 1999 to 2013." Remote Sens. 6, no. 9: 9130-9144.