Spatio-temporal variation of net primary productivity in Three-River-Source National Park using a multi-model integration method
The Three-River-Source National Park,located in the hinterland of the Qinghai-Tibet Plateau,possesses unique climate and abundant genetic species.However,this region is facing serious ecological problems due to climate change and human activities.Accurate monitoring of spatiotemporal variations in net primary productivity(NPP)in the Three-River-Source region is crucial for promoting ecological conservation and environment improvement.Model simulation is an important approach in terrestrial ecosystem research,but it inherently remains uncertain.Multi-model integration techniques can enhance the accuracy of NPP simulation and provide a better estimation of NPP variations for environmental governance.In this study,we used four process-based ecosystem models(i.e.,CLM,DALEC,CEVSA,and GLOPEM-CEVSA)and a multi-model integration analysis method to examine the spatiotemporal changes in NPP in the Three-River-Source National Park from 2000 to 2018 and to investigate the effect of climatic factors on NPP variations.The results show that NPP exhibited a decreasing trend from southeast to northwest,with an average annual NPP of 251.17 gC m-2 a-1 during 2000-2018.Ecosystems in the Lancang River Source Park had the highest NPP(267.24 gC m-2 a-1),followed by the Yellow River Source Park(198.81 gC m-2 a-1)and Yangtze River Source Park(121.88 gC m-2 a-1.The average NPP in the Three-River-Source region ranged from 222.00 to 298.02 gC m-2 a-1 and had a significant increasing trend with the rate of 9.8 gC m-2 10a-1.The attributions of NPP variation to climatic factors were far different among regions.It was primarily affected by temperature and radiation in the Yangtze River Source Park and Yellow River Source Park,but was also significantly influenced by precipitation in the Lancang River Source Park.The findings of this study could provide technical support and decision-making basis for assessing the effectiveness of ecological conservation and ecological management in the Three-River-Source National Park.
NPPmulti-model integrationThree-River-Source National Parkspatiotemporal variation
万方数据
维普
