| 基于KNDVI的大兴安岭生态功能区植被覆盖变化时空特征及驱动力分析 |
| 摘要点击 249 全文点击 17 投稿时间：2024-04-08 修订日期：2024-06-21 |
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| 中文关键词 大兴安岭 核归一化植被指数（KNDVI） 驱动力 地理探测器 植被变化 |
| 英文关键词 Greater Khingan Mountains kernel normalized difference vegetation index （KNDVI） driving force geo-detector vegetation changes |
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| 中文摘要 |
| 大兴安岭作为中国唯一的寒温带针叶林区,具有极其重要的生态价值及意义.探究大兴安岭植被时空变化及驱动因素,对于大兴安岭生态保护、我国生态安全及推动可持续发展具有重要意义.基于MOD09GA构建了核归一化植被指数（KNDVI）,将其作为衡量植被生长状况的指标,采用Theil-Sen斜率分析、Mann-Kendall检验和Hurst指数等方法,研究了大兴安岭生态功能区植被的时空动态变化及其未来发展趋势.通过最优参数的地理探测器,确定了相关环境因子对大兴安岭植被覆盖变化的驱动力.结果表明：①2001~2020年内,大兴安岭植被覆盖在空间分布上呈现出由北向南逐渐递减的趋式,KNDVI总体以0.03 （10 a）-1速率增加；②2001~2020年内,大兴安岭地区植被覆盖的空间分布格局始终保持东北-西南的方向性,并显示出向东北方向迁移的趋势.③土地利用类型的变化是影响大兴安岭生态功能区植被覆盖变化的主导因子；④与单因子相比,多因子之间的交互作用能够更好地解释植被覆盖的时空分异性.研究结果能够为深入理解大兴安岭生态功能区植被变化的内在机制,可持续发展以及应对全球气候变化提供科学建议. |
| 英文摘要 |
| The Greater Khingan Mountains, as the sole cold temperate coniferous forest region in China, possess paramount ecological value and importance. Investigating the spatiotemporal variations of vegetation and the underlying driving factors in the Greater Khingan Mountains is crucially important for the ecological preservation of this region, for China's ecological security, and for advancing sustainable development. By utilizing the MOD09GA dataset, we constructed the kernel normalized difference vegetation index （KNDVI） as a metric for assessing vegetation growth conditions. Employing methodologies, such as Theil-Sen slope analysis, Mann-Kendall test, and the Hurst index, we examined the spatiotemporal dynamics of the vegetation within the Greater Khingan Mountains ecological function area and projected its future developmental trends. Utilizing the optimal parameter geographical detector, we identified the key environmental factors influencing vegetation cover changes in the Greater Khingan Mountains. The findings indicate that： ① From 2001 to 2020, vegetation cover in the Greater Khingan Mountains exhibited a progressive decline from north to south in spatial distribution, with the KNDVI increasing at a rate of 0.03 （10 a）-1. ② From 2001 to 2020, the spatial distribution pattern of vegetation cover in the Greater Khingan Mountains maintained a consistent northeast-southwest orientation, demonstrating a migratory trend towards the northeast. ③ Changes in land use type were determined to be the primary factor influencing vegetation cover changes in the Greater Khingan Mountains ecological function area. ④ Compared to individual factors, the interplay among multiple factors provided a more comprehensive explanation of the spatiotemporal heterogeneity of vegetation cover. These research outcomes offer valuable insights into the intrinsic mechanisms of vegetation change in the Greater Khingan Mountains ecological function area, inform sustainable development strategies, and provide a scientific basis for addressing global climate change challenges. |
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