Zhao Jincai,Pan Tao.Spatiotemporal Variation of Multiple Time-Scale NPP and Its Response to Climate Change in the Yellow River Basin[J].Research of Soil and Water Conservation,2024,31(04):214-222,232.[doi:10.13869/j.cnki.rswc.2024.04.008]
基于多时间尺度的黄河流域植被NPP时空特征及其对气候变化的响应
- Title:
- Spatiotemporal Variation of Multiple Time-Scale NPP and Its Response to Climate Change in the Yellow River Basin
- 文章编号:
- 1005-3409(2024)04-0214-09
- Keywords:
- NPP; multiple time-scale analysis; driving factors; Yellow River Basin
- 分类号:
- Q948.112
- 文献标志码:
- A
- 摘要:
- [目的]刻画黄河流域植被净初级生产力在不同时间尺度下的变化特征,并揭示气候因子对植被NPP的影响,为黄河流域植被保护和可持续发展提供科学依据。[方法]基于遥感数据和气象数据,利用CASA模型逐月估算2000—2020年期间黄河流域植被NPP,并采用趋势分析、偏相关分析等方法在年度和季度两种时间尺度下探究了黄河流域植被NPP的时空变化特征及其对气候因子的响应。[结果]2000—2020年期间黄河流域年植被NPP以1.68 g/(m2·a)的速度显著增加,黄河中游地区的植被NPP最高,年增长速度最快。夏季植被NPP最高,增长速度最快,特别是黄河中游地区。黄河流域年度NPP显著受降水影响的范围最广,面积占比达31.95%,滞后期较长。气候因子影响季节NPP的滞后期普遍介于0～3个月。降水与夏、秋季植被NPP的关系以正相关为主,面积占比达70%以上; 气温和日照时长正向影响冬季NPP的区域面积约占75%。[结论]黄河流域植被NPP呈现明显的空间异质性和季节差异性,气候因子对植被NPP的影响具有不同程度的滞后期,黄河流域植被保护与恢复应从空间和时间两方面进行考量。
- Abstract:
- [Objective]The aims of this study are to characterize the changes in net primary productivity(NPP)at different time scales, and to reveal the impact of climate factors on vegetation NPP in Yellow River Basin. [Method]The NPP was estimated month by month using the CASA model from 2000 to 2020 based on remote sensing data and meteorological data, and the trend analysis and partial correlation analysis were used to investigate the temporal and spatial variations of NPP and its response to climate factors at annual and seasonal scales. [Results]The annual NPP in the Yellow River Basin showed significant upward trend with a rate of 1.68 g/(m2·a)from 2000 to 2020, and the NPP in the middle reaches was the highest and grew fastest. The summer NPP was the highest and had the fastest growth rate, especially in the middle reaches. Annual NPP was affected by precipitation most widely, accounting for 31.95% of the total area, and precipitation had a longer lag period than temperature and sunshine duration. The relationships between precipitation and NPP in summer and autumn were mainly positive, with a ratio of more than 70%. About 75% of area showed that temperature and sunshine duration positively influenced NPP in winter. [Conclusion]Vegetation NPP in the Yellow River Basin presented obvious spatial heterogeneity and seasonal variation, and the influence of climate factors on vegetation NPP had different lag periods. Therefore, vegetation protection and restoration in the Yellow River Basin should be considered from both spatial and temporal aspects.
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备注/Memo
收稿日期:2023-07-17 修回日期:2023-09-14
资助项目:国家自然科学基金(42001220); 河南师范大学青年科学基金(2021QK24)
第一作者:赵金彩(1989—),女,河南延津人,博士,副教授,主要从事资源评价与区域可持续发展研究。E-mail:zhaojincai1989@163.com
通信作者:潘涛(1974—),男,河南开封人,硕士,高级工程师,主要从事国土资源规划、调查和评价研究。E-mail:185650273@qq.com