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首页> 外文会议>Conference on Remote Sensing and Modeling of Ecosystems for Sustainability >Remotely-Sensed Changes in Agricultural Productivity in China from the 1980s to the 1990s
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Remotely-Sensed Changes in Agricultural Productivity in China from the 1980s to the 1990s

机译：从20世纪80年代到20世纪90年代，中国农业生产力的远程感应变化

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During the past 20 years, China's agro-ecosystems have great changes in response to changes in climate and agricultural management. Agricultural productivity is of vital importance to the national food security and sustainable development. So far, agricultural statistics are the only source of the data about changes in agricultural productivity in national scale, and there is little geo-spatial information on these changes. Remote sensing provides an important tool to monitor the spatial and temporal variations at high resolution, but it had yet to be used fully at regional and national scales to assess the interannual and long-term changes in agricultural productivity. This study estimated agricultural net primary productivity (ANPP) at the national level using a remote sensing-based production efficiency model, GLO-PEM. In the study, the arable area has been derived from TM data. ANPP was calculated from 8km, 10-day composite Advanced Very High Resolution Radiometers (AVHRR) data from 1981 to 2000 using GLO-PEM model. Using the data we analyzed the spatial variations in agricultural productivity in China between the 1980s and the 1990s. A 3-level hierarchy regionalization system is used in analyzing the spatial pattern and its changes in the agricultural productivity. China's average agricultural ANPP increased 59.8 million tons from the 1980s to the 1990s. The increment of ANPP mainly occurred in the major cereal-planting plains, especially HuangHuaiHai Plain. The characteristics of land resources are the dominating factors to cause the changes at 10 years scale. There were some decreases, which mainly caused by the degradation on fragile lands, the rapid expansion of rural industries, and the urban development from high-quality arable lands.
机译：在过去的20年中，中国农业生态系统对应对气候和农业管理的变化具有很大的变化。农业生产力对国家粮食安全和可持续发展至关重要。到目前为止，农业统计数据是关于国家规模的农业生产力变化数据的唯一来源，有关这些变化的地质空间信息很少。遥感提供了一种重要的工具，可以以高分辨率监控空间和时间变化，但它尚未在区域和国家规模中完全使用，以评估农业生产力的年间和长期变化。本研究估计了使用基于遥感的生产效率模型，GLO-PEM在国家一级的农业净初级生产率（ANPP）。在该研究中，可耕地源自TM数据。 ANPP使用Glo-PEM模型从1981年到2000年的8km，10天复合高级高分辨率辐射仪（AVHRR）数据计算。使用数据，我们在20世纪80年代和20世纪90年代之间分析了中国农业生产力的空间变化。三级层次结构区域化系统用于分析空间模式及其农业生产力的变化。中国的平均农业ANPP从20世纪80年代增加了5980万吨至20世纪90年代。 ANPP的增量主要发生在主要谷物种植平原中，尤其是黄淮海平原。土地资源的特点是主导因素，导致10年规模变化。有一些减少，主要是由于脆弱的土地的退化，农村行业的快速扩张以及高质量耕地的城市发展。

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