Zhang Geyu,Chen Wenhong,Wen Zhongming,et al.Spatiotemporal evolution of vegetation net primary productivity and its driving mechanism in the Yanhe River Basin[J].Research of Soil and Water Conservation,2025,32(03):206-213,221.[doi:10.13869/j.cnki.rswc.2025.03.031]
延河流域植被净初级生产力时空演变及其驱动机制
- Title:
- Spatiotemporal evolution of vegetation net primary productivity and its driving mechanism in the Yanhe River Basin
- 文章编号:
- 1005-3409（2025）03-0206-08
- 关键词:
- 时空动态; 净初级生产力（NPP）; 气候影响; 相关性分析; 延河流域
- Keywords:
- spatiotemporal dynamics; net primary productivity （NPP）; climate impact; correlation analysis; the Yanhe River Basin
- 分类号:
- Q948.112
- 文献标志码:
- A
- 摘要:
- [目的]探究延河流域植被净初级生产力（NPP）的时空变化特征，并深入分析其驱动因素和影响机制，以期为该区域的生态修复和环境保护工作提供科学依据和理论参考。[方法]基于MODIS数据，采用趋势分析、变异系数及相关性分析等方法，分析了2000—2020年延河流域植被NPP的时空动态、稳定性及其与影响因子间的响应关系。[结果]（1）2000—2020年延河流域植被NPP的平均值为321.18gC/（m2·a），上升趋势显著（p<0.01）。（2）NPP分布总体呈现南高北低的分布特征。（3）延河流域超过70%面积比例的植被NPP变化都呈较高波动或高波动程度，主要分布在延河流域东北部及志丹县大部分地区。（4）2000—2020年延河流域的气温和降水呈现波动增加趋势，降雨促进植被NPP正向增加，温度在一定程度上抑制植被NPP增加。（5）气温和降雨均对延河流域西北地区植被NPP变化有贡献，气温贡献率高于降雨贡献率。[结论]延河流域植被NPP受气温和降雨的影响，最小值和最大值分别出现在2000年和2018年，退耕还林（草）政策对植被生产力及生态系统健康有积极影响。
- Abstract:
- [Objective] To provide a scientific basis and theoretical reference for ecological restoration and enviro-nmental protection in the Yanhe River Basin, this study explores spatiotemporal variation characteristics of vegeta-tion net primary productivity (NPP) and analyzes its driving factors and underlying mechanisms. [Methods] Based on MODIS data, trend analysis, coefficient of variation, and correlation analysis were used to analyze the spatiotemporal dynamics, stability, and the response relationship between vegetation NPP and influencing factors in the Yanhe River Basin from 2000 to 2020. [Results] (1) The average vegetation NPP in the Yanhe River Basin from 2000 to 2020 was 321.18 gC/(m2 ? a), exhibiting a significant upward trend (p<0.01). (2) The distribution of NPP showed higher values in the south and lower values in the north. (3) Over 70% of the Yanhe River Basin exhibited relatively high or very high fluctuations in vegetation NPP, mainly in the northeast of the basin and most areas of Zhidan County. (4) From 2000 to 2020, temperature and precipitation in the Yanhe River Basin showed fluctuating increases, with precipitation promoting the positive growth of vegetation NPP, while temperature inhibited the increase of NPP to a certain extent. (5) Both temperature and precipitation contributed to vegetation NPP change in the northwestern part of the Yanhe River Basin, with temperature having a larger impact than precipitation. [Conclusion] Vegetation NPP in the Yanhe River Basin was influenced by temperature and precipitation, with the minimum and maximum values occurring in 2000 and 2018, respectively. The ‘returning farmland to forest (grassland) policy’ has a positive impact on vegetation productivity and ecosystem health.
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备注/Memo
收稿日期：2024-06-27 修回日期：2024-08-07 接受日期：2024-08-25
资助项目：国家自然科学基金项目（42107512）；陕西省重点研发计划（2024SF-YBXM-621）；陕西林业科技创新重点专项（SXLK2022-02-7）；中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放基金（IWHR-SKL-KF202315）
第一作者：张格语（2001—），女，陕西西安人，硕士研究生，研究方向为草地遥感及草地生态学。E-mail：zgy01426@163.com
通信作者：温仲明（1969—），男，陕西定边人，博士，研究员，主要从事植物生态恢复研究。E-mail：zmwen@ms.iswc.ac.cn
通信作者：刘洋洋（1991—），男，河南洛阳人，博士，副教授，主要从事草地遥感及陆地生态系统碳循环研究。E-mail：hnlylcbtks@163.com