HE Hongchang,MA Bingxin,JING Juanli,et al.Spatiotemporal Changes of NPP and Natural Factors in the Southwestern Karst Areas from 2000 to 2019[J].Research of Soil and Water Conservation,2022,29(03):172-178+188.
近20年西南喀斯特地区植被NPP时空变化及自然因素地理探测
- Title:
- Spatiotemporal Changes of NPP and Natural Factors in the Southwestern Karst Areas from 2000 to 2019
- 文章编号:
- 1005-3409(2022)03-0172-07
- Keywords:
- southwest karst area; NPP; trend analysis; Mann-Kendall test; R/S analysis; geographic detector
- 分类号:
- P931.5
- 文献标志码:
- A
- 摘要:
- 植被净初级生产力(Net Primary Production,NPP)是表征植物活动的重要变量,分析植被NPP时空变化及驱动力对生态保护及植被恢复建设具有重要意义。基于2000—2019年MOD17A3的NPP数据,结合基于站点的气象数据、DEM等数据,运用趋势分析、Mann-Kendall检验、R/S分析及地理探测器等方法,定量分析了西南喀斯特地区植被NPP空间分布、时空变化及未来趋势,进一步探讨了自然因子对西南地区植被NPP的驱动作用。结果表明:(1)2000—2019年西南喀斯特地区植被NPP空间分布上呈南高北低的空间分布格局,总体均值为751.37 gC/(m2·a)。(2)从时间尺度看,20 a间研究区植被NPP总体呈上升趋势,上升速度为3.67 gC/(m2·a); 从空间尺度看,20 a间西南喀斯特地区植被NPP呈上升趋势的面积占总面积的78.10%,呈显著上升的区域占42.14%,主要分布在四川盆地、乌蒙山一带。(3)未来研究区内植被NPP以上升趋势为主,呈持续上升趋势的面积占比为76.97%,呈强持续显著上升的面积占30.67%,主要分布在四川盆地及乌蒙山一带。(4)地理探测显示,影响西南喀斯特地区NPP变化的主导因子为湿度、生物温暖指数、日照时数和气温,其q均值均超过0.3; 各因子交互作用表现为双因子增强或非线性增强,其中高程∩生物温暖指数的q值最高,为0.498。综上,研究结果表明高程和生物温暖指数的共同作用对西南喀斯特地区的NPP影响最大。
- Abstract:
- Net primary production is an important variable that characterizes plant activities. Analyzing the spatiotemporal changes and driving forces of NPP is of great significance to ecological protection and vegetation restoration. Based on MOD17A3 NPP, site-based meteorological data, DEM and other datas, we used trend analysis, Mann-Kendall test, R/S analysis and geographic detector methods to analyze the temporal and spatial changes and future trends of NPP, and to further explore the driving effects of natural factors on NPP in southwest China. The results show that:(1)the NPP of the study area was higher in the south and lower in the north, with an overall average value of 751.37 gC/(m2·a);(2)from 2000—2019, the average annual NPP for the study period showed an overall upward trend, with a rising rate of 3.67 gC/(m2·a); the areas with an increasing trend accounted for 78.10% of the total study area, in which 42.14% of those areas showed a significant increase, mainly distributed in the Sichuan Basin and Wumeng Mountain area;(3)furthermore, the areas expected to maintain an increasing trend in the future, accounted for 76.97% of the total study area, in which the areas expected to show a strong, continuous and significant increase accounted for 30.67%, which mainly distributed in the Sichuan Basin and around Wumeng Mountain;(4)the humidity, biological warmth index, sunshine hours and temperature were the controlling factors affecting the change of NPP in the geographical exploration, the average q of above driving factors was greater than 0.3; the interaction between each two factors presented double-factor enhancement and non-linearity enhancement, among which the interaction q value of elevation and BWI was the highest with a magnitude of 0.498. It suggests that the combined effect of elevation and biological warmth index has the greatest influence on NPP in the southwestern karst area.
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备注/Memo
收稿日期:2021-05-07 修回日期:2021-05-25
资助项目:广西八桂学者专项项目; 国家自然科学基金项目(42061059); 广西青年资助项目(2020GXNSFBA297160); 广西空间信息与测绘重点实验室资助课题(191851016); 桂林理工大学科研启动资助项目(GUTQDJJ2019046,GUTQDJJ2019172)
第一作者:何宏昌(1960—),男,吉林四平人,博士学位,教授,主要从事遥感应用方面研究。E-mail:hhe@glut.edu.cn
通信作者:靖娟利(1977—),女,陕西西安人,硕士,副教授,主要从事环境遥感方面研究。E-mail:2003080@glut.edu.cn