| 基于CASA模型的2005—2019年云南断陷盆地NPP时空变化研究 |
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| 引用本文：张鑫彤,吴秀芹.2021.基于CASA模型的2005—2019年云南断陷盆地NPP时空变化研究[J].地球学报,42(3):426-434. |
| DOI：10.3975/cagsb.2020.082601 |
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| 基金项目:国家重点研发计划(编号: 2016YFC0502500; 2016YFC0502506);国家自然科学基金(编号:41671080) |
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| 中文摘要:净初级生产力(NPP)是研究生态系统中物质和能量流动的基础, NPP的空间分布与区域植被生长状况、地形、气候等因素息息相关, 其变化可以反映一个地区生态环境质量状况。岩溶断陷盆地是新生代断裂活动及溶蚀作用共同形成的山间盆地的一种类型, 由于其地形复杂、气候反差大且土地抗干扰能力差, 石漠化现象极为严重且治理难度大。断陷盆地主要分布在云南东部、四川攀枝花西昌及贵州西部, 经过近年来石漠化治理、陡坡地生态治理等为代表的生态环境建设综合治理工作, 生态文明建设成效显著, 为了进一步探究NPP对生态环境变化的响应, 研究了云南省断陷盆地所在县域NPP时空变化情况, 利用MODIS影像数据和CASA模型估算了其2005、2010、2015、2019年的NPP值并利用GIS进行分析。结果显示: 从时间尺度来看, 2005—2019年间云南省断陷盆地NPP平均水平呈现先下降后上升再下降的趋势。从空间上来看, NPP平均值自东向西、自南向北递减。东部、南部地区如师宗县、丘北县、马关县等NPP平均值较高, 而西、北部昆明西山区、昆明盘龙区、澄江县、呈贡县等NPP平均值较低, 不同地区间差异较大。结合石漠化治理情况来看, 石漠化面积变化显著的地区NPP变化也较大, NPP均值在石漠化变化率下降较大的地区有明显升高。NPP的动态变化, 说明了云南省断陷盆地近年植被有所恢复、石漠化治理工程取得了一定成效, 但仍不够稳定, 生态治理仍将是一项长期工程。 |
| 中文关键词:CASA模型 NPP 云南省 岩溶 断陷盆地 |
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| Research on the Spatial-temporal Variation of NPP in Yunnan Fault-depression Basins Based on CASA Model in 2005–2019 |
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| Abstract:Net primary productivity (NPP) is the basis for studying the flow of material and energy in the ecosystem. The spatial distribution of NPP is closely related to regional vegetation growth, terrain, climate and other factors, and its changes can reflect the ecological environment quality of a region. The karst faulted basin is a type of mountain basin formed by Cenozoic fault activity and dissolution. Due to its complex terrain, large climate contrast and poor land anti-interference capability, rock desertification is extremely serious and difficult to control. The fault-depression basins are mainly distributed in eastern Yunnan, Xichang, Panzhihua and western Guizhou. After comprehensive management of ecological environment construction represented by rocky desertification management and steep slope ecological management in recent years, the construction of ecological civilization has achieved remarkable results. In order to further explore the response of NPP to changes in the ecological environment, the authors studied the spatial and temporal changes of NPP in Yunnan Fault-depression Basins in 2005, 2010, 2015 and 2019 using the Modis image, the CASA model and GIS. The results are as follows: On the time scale, from 2005 to 2019, the NPP level in Yunnan Fault-depression Basins was declined first, then increased and then decreased again. From a spatial point of view, the average value of NPP decreases from east to west and from south to north. The NPP averages in the eastern and southern regions such as Shizong County, Qiubei County, and Maguan County are higher, while the NPP averages in the west and northern Kunming Xishan District, Kunming Panlong District, Chengjiang County and Chenggong County are lower, with big differences existent between different regions. In addition, in the view of the rocky desertification control, the NPP change is also greater in areas where the area of rocky desertification changes significantly, and the average NPP is significantly increased in areas where the rate of change in rocky desertification decreases significantly. The dynamic changes of NPP indicate that the vegetation in the fault-depression basin in Yunnan Province has been recovered greatly and the rock desertification control project has achieved certain results in recent years; nevertheless, it is still not stable enough, and hence ecological governance will still be a long-term project. |
| keywords:CASA model NPP Yunnan karst fault-depression basins |
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