| 摘要: |
| 【目的】为了解2000—2022年贵州省植被碳源/汇的时空格局变化情况。【方法】基于MOD17A3HGF数据和贵州省地面气象观测资料，利用趋势分析和相关性分析方法，对23 a来贵州省植被净生态系统生产力NEP的时空分布特征及其与气象因子的关系进行分析。【结果】（1）2000—2022年贵州省植被NEP变化在空间格局上整体表现为碳汇，面积占比约为74.59%，呈“南高北低、东高西低”的分布特征，其中黔南州、安顺市南部和黔西南州的西南及东南部等地区碳汇能力较强，NEP集中在400.00 g·C·m-2·a-1左右。植被NEP以较低和中等波动为主，占比91.97%，稳定性较高。（2）近23 a贵州省植被年均NEP值呈极显著上升趋势，在2022年达到最高552.60 g·C·m-2·a-1。毕节、黔西南、安顺和遵义西北部NEP变化斜率多处于0 ~ 10 g·C·m-2·a-1之间，贵阳、遵义、铜仁、黔南、黔东南等市（州）的城镇周边区域的变化斜率小于-5 g·C·m-2·a-1。同时，贵州省林地和草地的年均NEP值有较大的波动起伏，但整体呈上升趋势。（3）贵州省植被NEP与气温呈显著正相关，通过了0.01的显著性水平检验，但其与降水的相关性不显著，表明贵州省植被的碳汇能力主要受到气温影响。【结论】本研究有助于加深对贵州省植被生态系统碳汇功能的了解程度，为贵州省植被生态系统的碳循环、碳储存的动态变化提供支撑。 |
| 关键词: 贵州省；植被净生态系统生产力；碳源汇；气象因子；相关性 |
| DOI： |
| 投稿时间：2024-04-10修订日期：2024-08-02 |
| 基金项目:基于卫星遥感与生态模型的贵州省碳汇监测技术研究（黔科合支撑[2023]一般203）;喀斯特石漠化植被生态质量变化对气候因子的响应(黔科合基础-ZK[2022]一般 273)；贵州省气象局科研业务项目( 黔气科登[2023]11-06号)：2000-2022年贵州省植被碳源/汇的时空格局变化及其与气象因子的关系。 |
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| Spatiotemporal Variation of Vegetation Carbon Source/Sink and Their Relationship with Meteorological Factors in Guizhou Province from 2000 to 2022 |
| long jieqi,Liu Xuanming,shang yuanyuan,jiang yanling,Duan Ying,Liao Liufeng |
| (Guizhou Ecological Meteorology and Agrometeorology Center) |
| Abstract: |
| To understand spatiotemporal variation of vegetation carbon source and sink in Guizhou province from 2000 to 2022, this dissertation were based on MOD17A3HGF datas and ground meteorological observation datas from Guizhou Province. Utilized trend analysis and correlation analysis methods, we investigated the temporal and spatial distribution characteristics of net ecosystem productivity in the vegetation of Guizhou Province over the past 23 years and their relationship with meteorological factors. The results showed that: (1) From 2000 to 2022, the spatial pattern of vegetation NEP changes in Guizhou Province generally showed a predominance of carbon sinks, with an area accounting for approximately 74.59%. The distribution characteristics present a“higher in the south and lower in the north, higher in the east and lower in the west”pattern. Regions such as southern Anshun, the southwestern and southeastern parts of Qianxinan, and Qiannan demonstrate stronger carbon sink capacity, with NEP concentrated around 400.00 g·C·m-2·a-1. The NEP of vegetation is mainly characterized by low to moderate fluctuations, accounting for 91.97%, indicating high stability. (2) Over the past 23 years, the average annual NEP of vegetation in Guizhou Province has shown a highly significant upward trend, reaching a peak of 552.60 g·C·m-2·a-1 in 2022. In Bijie, Qianxinan, Anshun, and the northwestern part of Zunyi, the NEP change slope ranges between 0 ~ 10 g·C·m-2·a-1. In Guiyang, Zunyi, Tongren, Qiannan, and Qiandongnan, the change slopes in the areas surrounding the cities (prefectures) are less than -5 g·C·m-2·a-1. Meanwhile, the average annual NEP values of forest and grassland in Guizhou Province have experienced considerable fluctuations but overall show an upward trend. (3) The NEP of vegetation in Guizhou Province is significantly positively correlated with temperature, passing the 0.01 significance level test, but its correlation with precipitation is not significant. This indicates that the carbon sink capacity of the vegetation in Guizhou Province is primarily influenced by temperature. This study contributes to a deeper understanding of the carbon sink functions of the vegetation ecosystems in Guizhou Province and supports the dynamic changes in carbon cycling and carbon storage in the vegetation ecosystems of the province. |
| Key words: Guizhou Province, NEP, carbon source/sink, meteorological factors, relativity |
