An improved Carnegie Ames Stanford Approach model （CASA model） was used to estimate the net primary productivity （NPP） of the Northeast China Transect （NECT） every month from 1982 to 2000. The spatial-temporal d...An improved Carnegie Ames Stanford Approach model （CASA model） was used to estimate the net primary productivity （NPP） of the Northeast China Transect （NECT） every month from 1982 to 2000. The spatial-temporal distribution of NPP along NECT and its response to climatic change were also analyzed. Results showed that the change tendency of NPP spatial distribution in NECT is quite similar to that of precipitation and their spatial correlation coefficient is up to 0.84 （P 〈 0.01）. The inter-annual variation of NPP in NECT is mainly affected by the change of the aestival NPP every year, which accounts for 67.6% of the inter-annual increase in NPP and their spatial correlation coefficient is 0.95 （P 〈 0.01）. The NPP in NECT is mainly cumulated between May and September, which accounts for 89.8% of the annual NPP. The NPP in summer （June to August） accounts for 65.9% of the annual NPP and is the lowest in winter. Recent climate changes have enhanced plant growth in NECT. The mean NPP increased 14.3% from 1980s to 1990s. The inter-annual linear trend of NPP is 4.6 gC·m^-2·a^-1, and the relative trend is 1.17%, which owns mainly to the increasing temperature.展开更多
随着航天航空遥感技术的飞速发展,立体式、多层次、多视角、全方位和全天候对地观测的时代已然到来。如何激活数据价值,更好地服务行业应用,满足快速增长的遥感应用需求,成为遥感企业面临的迫切课题。遥感图像处理软件作为遥感数据与行...随着航天航空遥感技术的飞速发展,立体式、多层次、多视角、全方位和全天候对地观测的时代已然到来。如何激活数据价值,更好地服务行业应用,满足快速增长的遥感应用需求,成为遥感企业面临的迫切课题。遥感图像处理软件作为遥感数据与行业应用的桥梁,在遥感产业化过程中发挥着不可替代的作用。本文概述了国内外遥感卫星数据和遥感软件发展历程,通过中国国产遥感图像处理软件——像素专家(pixel information expert,PIE)阐述了国产遥感软件的研制进展、典型应用和未来技术发展方向。PIE软件具有多源遥感载荷全方位支持、全谱段要素信息智能提取、多行业全业务链深度融合、海量遥感数据快速处理和自主产权程序完全可控等5大核心能力。未来将加强与大数据、云计算和人工智能等技术前沿领域的交叉融合,提升遥感数据分析处理、知识挖掘与决策支持能力,实现遥感数据的按需获取快速传输和专题信息聚焦服务。展开更多
基金This paper was supported by the National Natural Sci-ence Foundation of China (Grant No. 40371001) and the Youth Foundation of Beijing Normal University
文摘An improved Carnegie Ames Stanford Approach model （CASA model） was used to estimate the net primary productivity （NPP） of the Northeast China Transect （NECT） every month from 1982 to 2000. The spatial-temporal distribution of NPP along NECT and its response to climatic change were also analyzed. Results showed that the change tendency of NPP spatial distribution in NECT is quite similar to that of precipitation and their spatial correlation coefficient is up to 0.84 （P 〈 0.01）. The inter-annual variation of NPP in NECT is mainly affected by the change of the aestival NPP every year, which accounts for 67.6% of the inter-annual increase in NPP and their spatial correlation coefficient is 0.95 （P 〈 0.01）. The NPP in NECT is mainly cumulated between May and September, which accounts for 89.8% of the annual NPP. The NPP in summer （June to August） accounts for 65.9% of the annual NPP and is the lowest in winter. Recent climate changes have enhanced plant growth in NECT. The mean NPP increased 14.3% from 1980s to 1990s. The inter-annual linear trend of NPP is 4.6 gC·m^-2·a^-1, and the relative trend is 1.17%, which owns mainly to the increasing temperature.
文摘随着航天航空遥感技术的飞速发展,立体式、多层次、多视角、全方位和全天候对地观测的时代已然到来。如何激活数据价值,更好地服务行业应用,满足快速增长的遥感应用需求,成为遥感企业面临的迫切课题。遥感图像处理软件作为遥感数据与行业应用的桥梁,在遥感产业化过程中发挥着不可替代的作用。本文概述了国内外遥感卫星数据和遥感软件发展历程,通过中国国产遥感图像处理软件——像素专家(pixel information expert,PIE)阐述了国产遥感软件的研制进展、典型应用和未来技术发展方向。PIE软件具有多源遥感载荷全方位支持、全谱段要素信息智能提取、多行业全业务链深度融合、海量遥感数据快速处理和自主产权程序完全可控等5大核心能力。未来将加强与大数据、云计算和人工智能等技术前沿领域的交叉融合,提升遥感数据分析处理、知识挖掘与决策支持能力,实现遥感数据的按需获取快速传输和专题信息聚焦服务。
