Acta Geographica Sinica ›› 2004, Vol. 59 ›› Issue (4): 581-591.doi: 10.11821/xb200404012

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Impacts of Land Use and Climate Change on Regional Net Primary Productivity

GAO Zhiqiang, LIU Jiyuan, CAO Mingkui, LI Kerang, TAO Bo   

  1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2004-01-10 Revised:2004-03-22 Online:2004-07-25 Published:2010-09-09
  • Supported by:

    National"973" Project, No.2002CB412507; National Natural Science Foundation of China, No.90202002, Knowledge Innovation Project of IGSNRR, CAS, No.CXIOG-E01-02-04; One-Hundred Talents Program

Abstract:

Combined with recent historical period of climate data and two periods of land use data sets from remote sensing data, we test the net primary productivity (NPP) data sets over last 20 years in North China modelled by the satellite data-driven Global Production Efficiency Model (GLO-PEM) for detecting the widespread spatial and temporal characteristics of the impacts of climate and land use change on the regional NPP. Our results shows that over the past 20 years, the average annual temperature in the research region has remarkably increased by more than 0.064oC, but over the same period, there has been a 1.49 mm decrease in annual precipitation and decrease in NPP by an annual rate of 6.9 TgC. The NPP changes in the study region were greatly affected by the average temperature and precipitation by ten-day periods as well as the seasonal temperature and precipitation. The correlation between seasonal NPP and seasonal precipitation and temperature is highly consistent with land cover spatially, and the correlation coefficient changes with the changes of vegetation types. The analysis reveals that the areas of change in land use only take up 5.45% of the whole study region, so the impacts of climate changes on the NPP dominate (90% of the total). However, land use plays an absolute dominative role in the areas with land cover changes, accounting for 97% of the total. Over the past 20 years, the NPP in the whole study region remarkably reduced due to obvious precipitation decrease and temperature rise. Between two periods of land use (about 10 years), the changes in climate are predicted to cause a decrease in NPP by 78 (±0.6) TgC, and combined impacts of climate changes and land use to cause a decrease in NPP by 87 (±0.8) TgC.

Key words: climate change, land use change, NPP, GLO-PEM, North China