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首页> 外文期刊>Journal of geographical sciences >Impacts of land use and climate change on regional net primary productivity
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Impacts of land use and climate change on regional net primary productivity

机译：土地利用和气候变化对区域净初级生产力的影响

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摘要

Combined with recent historical climate data and two periods of land use data sets from remote sensing data, we test the net primary productivity (NPP) data sets 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 show that over the past 20 years, the mean annual temperature in the study region has remarkably increased by more than 0.064 ℃, 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 in the study region. 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 related areas in land use change only take up 5.45% of the whole studied region, so the climate changes dominate the impacts on the NPP in the whole study region (90% of the total). However, land use plays an absolute dominative role in areas with land cover changes, accounting for 97% of the total. From 1981 to 2000, 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 promote a decrease in NPP by 78 ( + -0.6) TgC, and integrated impacts of climate changes and land use to promote a decrease in NPP by 87(+-0.8) TgC.
机译：结合最近的历史气候数据和遥感数据的两个时期的土地利用数据集，我们测试了由卫星数据驱动的全球生产效率模型（GLO-PEM）建模的华北地区的净初级生产力（NPP）数据集，检测气候和土地利用变化对区域核电厂的影响的时空分布特征。我们的结果表明，在过去的20年中，研究区域的年平均温度显着增加了0.064℃以上，但在同一时期，年降水量减少了1.49毫米，而NPP则每年减少了1.49毫米。速率为6.9 TgC。研究区域的NPP变化受十天平均温度和降水以及研究区域的季节性温度和降水的影响很大。季节NPP与季节降水和温度之间的相关性在空间上与土地覆盖高度一致，并且相关系数随植被类型的变化而变化。分析表明，土地利用变化的相关区域仅占整个研究区域的5.45％，因此气候变化主导了整个研究区域对NPP的影响（占总数的90％）。然而，在土地覆盖变化的地区，土地使用起着绝对的主导作用，占总数的97％。从1981年到2000年，由于降水明显减少和温度升高，整个研究区的NPP显着降低。在两个土地使用周期（约10年）之间，预计气候变化将使NPP降低78（+ -0.6）TgC，气候变化和土地利用的综合影响将NPP降低87 （+ -0.8）TgC。

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