| 长株潭绿心区植被月NPP的时空变化及对气候地形因子的响应 |
| 摘要点击 1601 全文点击 223 投稿时间：2023-12-04 修订日期：2024-03-14 |
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| 中文关键词 长株潭绿心区 植被净初级生产力（NPP） 时空变化 气候-地形因子 改进的CASA模型 |
| 英文关键词 Chang-Zhu-Tan Green Heart area vegetation net primary productivity （NPP） spatiotemporal variation climate and terrain factors improved CASA model |
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| 中文摘要 |
| 长株潭绿心区是中国最大的城市群绿心区. 为明晰其植被净初级生产力（NPP）的时空变化及其驱动因素,基于实测和遥感数据,利用改进的CASA模型估算了长株潭绿心区2011~2020年逐月的植被NPP,运用线性回归和空间偏相关分析借助ArcGIS 10.2软件探讨绿心区植被月NPP的时空变化及其对气候和地形因子的响应. 结果表明,长株潭绿心区植被月NPP呈先增加后下降的趋势,1~7月植被NPP平均增速（以C计,下同）为5.75 g·（m2·month）-1,8~12月植被NPP月均降速为2.64 g·（m2·month）-1. 绿心区月植被NPP空间分布差异明显,变异系数的变化范围为34.52%~48.76%.各月植被NPP的高值集中分布在绿心区中部和东部的生态核心地带,低值则分布在绿心区西部的湘江沿岸及南部狭长地带. 气候与地形因子对绿心区植被月NPP的影响存在正向促进与负向抑制作用；气候因子中太阳辐射是植被月NPP变化的主控因子,地形因子对植被NPP的影响相对较弱,其中坡向的正向影响大于海拔和坡度. |
| 英文摘要 |
| The Chang-Zhu-Tan ecological Green Heart area is the largest urban agglomeration Green Heart area in China. To clarify the spatiotemporal changes and driving factors of net primary productivity （NPP） of vegetation in the Chang-Zhu-Tan Green Heart area, an improved Carnegie Ames Stanford Approach （CASA） model was used to estimate the monthly vegetation NPP from 2011 to 2020 based on measured and remote sensing data. With the help of ArcGIS 10.2 software, linear regression and spatial partial correlation analysis were used to explore the spatiotemporal variations in monthly vegetation NPP and its responses to climate and terrain factors. The results showed that the monthly vegetation NPP in the Chang-Zhu-Tan Green Heart area showed an overall trend of first increasing and then decreasing, with an average vegetation NPP growth rate （measured in C, the same below） of 5.75 g·（m2·month）-1 from January to July and a monthly decrease rate of 2.64 g·（m2·month）-1 from August to December. The spatial distribution of monthly vegetation NPP in the Green Heart area showed a significant difference, with a coefficient of variation ranging from 34.52% to 48.76%. The high values of vegetation NPP in each month were concentrated in the ecological core areas of the central and eastern parts in the Green Heart area, whereas the low values were mainly distributed along the Xiangjiang River in the western part and in the narrow and elongated areas in the southern part of the Green Heart Area. The impact of climate and terrain factors on the monthly NPP of vegetation in the Green Heart area had both positive and negative inhibitory effects. Among climate factors, solar radiation was the major controlling factor for monthly vegetation NPP changes. The impact of terrain factors on vegetation NPP was relatively weak, with slope orientation having a greater positive impact on vegetation NPP than altitude and slope. |
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