| 2001~2022年秦巴山区生态碳汇时空格局及驱动力分析 |
| 摘要点击 1490 全文点击 180 投稿时间：2024-01-09 修订日期：2024-03-28 |
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| 中文关键词 净生态系统生产力（NEP） 碳汇 年际变化 归因分析 秦巴山区 |
| 英文关键词 net ecosystem productivity（NEP） carbon sink interannual variation attribution analysis Qinling-Daba Mountain area |
| 作者 | 单位 | E-mail | | 白天豪 | 西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127 | bth143727@163.com | | 贡恩军 | 西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127 | | | 周娜芳 | 西北大学碳中和学院, 陕西省碳中和技术重点实验室, 西安 710127 | | | 赵婷 | 西安外国语大学旅游学院, 西安 710128 | | | 白红英 | 西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127 | | | 王俊 | 西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127
西北大学碳中和学院, 陕西省碳中和技术重点实验室, 西安 710127 | wangj@nwu.edu.cn |
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| 中文摘要 |
| 秦巴山区作为我国重要的生态保护区,在实现碳中和目标中有着重要的战略地位. 基于气温、降水、太阳辐射和归一化植被指数（NDVI）等多源数据,通过替换模型指标对CASA模型进行了改进,模拟了秦巴山区2001～2022年植被净初级生产力（NPP）,并使用模拟的植被NPP减土壤呼吸（Rh）的方法进一步计算区域净生态系统生产力（NEP）,用于表征生态碳汇. 采用线性回归模型、MK趋势检验、偏相关分析和复相关分析等方法探讨了秦巴山区近22 a NEP的时空演变特征以及各因子的影响程度. 结果表明：①从时间上看,秦巴山区近22 a植被NEP（以C计）呈现波动上升趋势,年均增长168 g·m-2·a-1,22 a间区域植被NEP（以C计）总计增长了52.2 Tg. ②从空间上来看,秦巴山区总体表现为碳汇区,只有0.3%的地区表现为碳源,主要呈点状分布在秦巴山区的东侧. ③秦巴山区碳汇变化是多重因子相互作用的结果,其中60%贡献来自于气候因子. 气温、降水量和太阳辐射共同弱驱动的区域占比高达29%,且呈散点状分布在秦巴山区中部和东部地区. |
| 英文摘要 |
| The Qinling-Daba Mountain area, an essential ecological conservation zone in China, occupies a pivotal position in the pursuit of carbon neutrality. Using diverse data sources, including temperature, precipitation, solar radiation, and the Normalized Difference Vegetation Index, we refined the CASA model by replacing model indicators. This enhanced model simulated the net primary productivity of vegetation in the Qinling-Daba Mountain area from 2001 to 2022. Additionally, we employed a method that subtracts soil respiration （Rh） from the simulated vegetation net primary productivity to calculate the regional net ecosystem productivity （NEP）, thereby characterizing the ecological carbon sink. Employing techniques such as linear regression analysis, MK trend testing, partial correlation analysis, and composite correlation analysis, we examined the spatiotemporal evolution characteristics of NEP over the past 22 years in the Qinling-Daba Mountain area and assessed the degree of influence of various factors. Our findings revealed that： ① Over the past 22 years, the vegetation NEP in the Qinling-Daba Mountain area displayed a fluctuating upward trend, with an average annual increase of 168 g·m-2·a-1, resulting in a total increase of 52.2 Tg in regional vegetation NEP （in terms of C） over the 22-year period. ② Spatially, the Qinling-Daba Mountain area predominantly functioned as a carbon sink, with only 0.3% of the area serving as a carbon source, primarily concentrated in a punctate pattern on the eastern side of the Qinling-Daba Mountain area. ③ Changes in the carbon sink in the Qinling-Daba Mountain area were the consequence of the interaction of multiple factors, with 60% of the contribution stemming from climatic factors. The combined weak driving force of temperature, precipitation, and solar radiation accounted for as much as 29%, distributed in a scattered manner across the central and eastern regions of the Qinling-Daba Mountain area. |
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