| 黄河上中游流域植被净初级生产力空间特征及驱动因素分析 |
| 摘要点击 2162 全文点击 326 投稿时间：2023-12-06 修订日期：2024-01-25 |
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| 中文关键词 黄河上中游 净初级生产力（NPP） 时空演变 驱动因子 极端降雨 |
| 英文关键词 upper and middle reaches of the Yellow River net primary productivity（NPP） spatiotemporal variation driving factors extreme rainfall |
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| 中文摘要 |
| 植被净初级生产力（NPP）在陆地生态系统中扮演着关键角色,深入研究年均NPP及其驱动因子对于促进区域生态建设和可持续发展具有重要意义.本文利用2000~2020年的MOD17A3 年均NPP数据,采用趋势分析、Hurst指数、随机森林模型、偏依赖模型、地理加权回归以及偏最小二乘-结构方程（PLS-SEM）模型等方法,分析黄河上中游地区年均NPP年度变化特征及其与驱动因子的关系.结果显示： ①在2000~2020年期间,黄河上中游地区年均NPP总体呈逐年增长趋势,其中79.25%区域年均NPP表现出显著改善,0.25%区域年均NPP则呈现严重退化趋势. ②影响黄河上中游年均NPP变化的主导因子为降雨量、NDVI、干旱和相对湿度. 适宜年均NPP增加的降雨量范围为400~650 mm,相对湿度范围为40%~70%,NDVI与年均NPP呈线性正相关,干旱指数与年均NPP呈显著负相关关系,当干旱指数超过阈值8时,年均NPP趋于平稳. ③极端降雨通过影响植被生长状况间接影响流域年均NPP变化,极端降雨指数中对流域年均NPP影响程度由高到低依次为：R10>R95P>PRCPTOT>SDII>Rx5day>R99P. ④黄河上中游在生态建设方面的下一步应重点关注黄河北部的干旱和严重干旱区域,因地制宜,提升区域生态环境水平. |
| 英文摘要 |
| The Net Primary Productivity （NPP） of vegetation plays a crucial role in terrestrial ecosystems, and a detailed investigation into the annual average NPP and its driving factors is of significant importance for promoting regional ecological construction and sustainable development. This research utilized MOD17A3 annual average NPP data from 2000 to 2020 and employed methods such as trend analysis, Hurst index, random forest model, partial dependence model, geographic weighted regression, and partial least squares-structural equation model （PLS-SEM） to analyze the annual variation characteristics of NPP and its relationship with driving factors in the upper and middle reaches of the Yellow River. The results showed： ① During the period from 2000 to 2020, the annual average NPP in the upper and middle reaches of the Yellow River generally exhibited a year-on-year increasing trend, with 79.25% of the region showing a significant improvement in annual average NPP, while 0.25% of the region exhibited a severe degradation trend. ② The dominant influencing factors of the annual average NPP in the upper and middle reaches of the Yellow River included precipitation, NDVI, drought, and relative humidity. The suitable range for increasing annual average NPP was 400 mm to 650 mm for precipitation and 40% to 70% for relative humidity, and NDVI showed a significantly linear positive correlation with annual average NPP. Drought index was negatively correlated with annual average NPP. The annual average NPP tended to stabilize and did not decline further when the drought index exceeded the threshold of 8. ③ Extreme rainfall indirectly affected the variation in annual average NPP in the basin by influencing the vegetation growth condition. The impact degree of extreme rainfall indices on the annual average NPP in the basin was in the following order： R10>R95P>PRCPTOT>SDII>Rx5day>R99P. ④ The next steps in ecological construction in the upper and middle reaches of the Yellow River should focus on the arid and severely arid regions in the northern part of the Yellow River, adapting measures to local conditions and enhancing the regional ecological environment. |
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