State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Int J Environ Res Public Health. 2022 Dec 21;20(1):92. doi: 10.3390/ijerph20010092.
Net ecosystem productivity (NEP), which is considered an important indicator to measure the carbon source/sink size of ecosystems on a regional scale, has been widely studied in recent years. Since China's terrestrial NEP plays an important role in the global carbon cycle, it is of great significance to systematically examine its spatiotemporal pattern and driving factors. Based on China's terrestrial NEP products estimated by a data-driven model from 1981 to 2018, the spatial and temporal pattern of China's terrestrial NEP was analyzed, as well as its response to climate change. The results demonstrate that the NEP in China has shown a pattern of high value in the west and low value in the east over the past 40 years. NEP in China from 1981 to 2018 showed a significantly increasing trend, and the NEP change trend was quite different in two sub-periods (i.e., 1981-1999 and 2000-2018). The temporal and spatial changes of China's terrestrial NEP in the past 40 years were affected by both temperature and precipitation. However, the area affected by precipitation was larger. Our results provide a valuable reference for the carbon sequestration capacity of China's terrestrial ecosystem.
净生态系统生产力（NEP）被认为是衡量区域尺度生态系统碳源/汇大小的重要指标，近年来受到了广泛的研究。由于中国陆地 NEP 在全球碳循环中起着重要作用，因此系统地研究其时空格局及其驱动因素具有重要意义。本研究基于 1981 年至 2018 年数据驱动模型估算的中国陆地 NEP 产品，分析了中国陆地 NEP 的时空格局及其对气候变化的响应。结果表明，在过去的 40 年中，中国的 NEP 呈现出西部高值、东部低值的格局。1981 年至 2018 年，中国的 NEP 呈显著增加趋势，在两个子时段（即 1981-1999 年和 2000-2018 年）的 NEP 变化趋势差异较大。过去 40 年中国陆地 NEP 的时空变化既受温度又受降水的影响，但降水的影响范围更大。本研究结果为评估中国陆地生态系统的碳汇能力提供了有价值的参考。
