中国森林生态系统净初级生产力时空分布及其对气候变化的响应研究综述

植被生产力是表征植被活力的关键变量,能够反映陆地生态系统的质量状况。森林净初级生产力(NPP)对气候变化的响应研究,是理解森林生态系统碳收支的基础,有助于认识气候变化与森林生态系统的相互作用机制,因而对于深刻理解陆地碳循环和全球变化均具有重要意义。目前我国已有大量针对近几十年国家和区域尺度上植被NPP时空分布的研究,其中专门针对森林生态系统NPP的研究也有不少。研究尺度多为全国范围或者片段式区域,以行政区或流域尺度最为多见。然而,这些研究总体比较分散,其中部分研究的结果、结论并不一致甚至相悖,尚缺乏异同性分析与比较,也缺乏系统性和综合性。这并不利于全面掌握我国相关研究的整体情况、了解清晰明确的研究结论以及进行更深层次的规律及原因探究,也非常影响对森林NPP的精确评估及机理认识,因而,对相关研究成果进行梳理、整合和总结非常有必要。鉴于此,本文收集了近几十年我国植被NPP研究的相关文献,依据其研究结果,系统地综述了全国及区域尺度森林生态系统NPP的时空分布规律及未来可能变化趋势,揭示出NPP与气候因子(以CO₂、温度、降水为主)的关系及对气候变化的响应情况,并指出目前...

Review of spatio-temporal distribution of net primary productity in forest ecosystem and its responses to climate change in China

Vegetation productivity is a key variable of vegetation vitality, and it can reflect the quality of terrestrial ecosystem. Studying on response of forest net primary productivity (NPP) to climate change is the basis of understanding carbon budget of forest ecosystem, which is helpful to understand the interaction mechanism between climate change and forest ecosystem, and thus is of great significance to understand the terrestrial carbon cycle and global change. At present, there are a lot of studies on the spatio-temporal distribution of vegetation NPP at national and regional scales in China, in which many studies are on NPP in forest ecosystem. Most of the research scales are nationwide or fragmented areas, with administrative or watershed scales being the most common. However, these studies are generally scattered, and some of them have inconsistent or even contradictory results. Meanwhile they lack analysis and comparison of similarities and differences, as well as systematization and comprehensiveness. This situation is not conducive to the comprehensive grasp of the overall research in China, to understanding the clear and definite research conclusions, and to further exploring of the regular pattern and its causes. It also greatly affects the accurate assessment and understanding mechanism of forest NPP. Therefore, it is necessary to sort out, integrate and summarize the relevant research results. In view of this, we collected relevant literature on the vegetation NPP research in China in recent decades. Based on the research results, we systematically summarized the spatio-temporal distribution of the NPP in forest ecosystems at national and regional scales and its possible future trends, and revealed the relationship of NPP with climate factors (mainly CO₂, temperature, and precipitation) and its response to climate change. We also pointed out the main problems existing in the current research and the key research directions in the future. It is expected that this study will play a reference role for further research.