LIU Heng,TANG Diwei,SONG Eping,et al.Spatiotemporal Dynamics of Vegetation Net Primary Productivity and Its Driving Factors in Wuling Mountainous Area During 2000-2015[J].Research of Soil and Water Conservation,2020,27(06):218-225.
2000-2015年武陵山区植被净初级生产力的时空动态特征及其驱动因子
- Title:
- Spatiotemporal Dynamics of Vegetation Net Primary Productivity and Its Driving Factors in Wuling Mountainous Area During 2000-2015
- 文章编号:
- 1005-3409(2020)06-0218-08
- Keywords:
- net primary productivity; spatiotemporal dynamic; driving factors; Wuling Mountainous area
- 分类号:
- Q948
- 文献标志码:
- A
- 摘要:
- 为了揭示武陵山区植被净初级生产力(NPP)时空动态特征和定量识别相关驱动因子及其影响力,基于2000—2015年MOD17A3数据集,采用变异系数、趋势分析和Hurst指数分析了该区植被NPP的时空动态特征及变化趋势,并利用相关分析、地理探测器从自然和人为两方面对驱动因子进行了解析。结果表明:(1)2000—2015年,武陵山区植被NPP整体呈不显著下降趋势,年际波动性明显; 常绿针叶林和常绿阔叶林是生产能力最强的植被; 空间上呈现中部高、四周低的分布格局; 近16年表现出北增南减的变化特征,未来趋势以反持续为主,NPP可能增加。(2)驱动因子上,NPP与降水、气温均为正相关,气温为主要气象因子; NPP随着高程、坡度的增加均表现先增后减的趋势; 耕地转林地是土地利用变化引起NPP变化的主要地类转换。(3)因子影响力上,气温>降水>高程>土地利用>坡度,气温、降水和高程是主导因子,坡度和土地利用是重要因子,自然因素影响力强于人为因素。
- Abstract:
- To reveal the spatiotemporal dynamic characteristics of vegetation net primary productivity(NPP)in the Wuling Mountainous area and to quantitatively identify the relevant driving factors and their influence, based on the MOD17A3 dataset from 2000 to 2015, the coefficient of variation, trend analysis, and Hurst index were used to analyze the NPP spatiotemporal dynamic characteristics and changing trends, and driving factors were analyzed from natural and man-made aspects using correlation analysis and geo-detector. The results showed that:(1)between 2000 and 2015, the vegetation NPP in the Wuling Mountainous area showed no significant decline trend as a whole, with great inter-annual fluctuation; evergreen coniferous forest and evergreen broad-leaved forest were the most productive vegetation. The spatial distribution pattern of NPP was high in the middle and low in the surrounding area; the trend of NPP over the 16 years had increased in the north and decreased in the south, and the future trend will be the main anti-continuity, and the NPP will increase;(2)in terms of driving factors, NPP was positively correlated with annual precipitation and average annual temperature, and the temperature was the main climate factor; NPP increased first and then decreased with the increase of elevation and slope; the conversion of cultivated land to forestland was the main conversion of NPP caused by land-use change;(3)influence level of factor decreased in the order: temperature>precipitation>elevation>land-use>slope, temperature, precipitation, and elevation were the dominant factors, slope and land-use were the important factors, and the influence of natural factors was stronger than that of human factors.
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备注/Memo
收稿日期:2020-01-03 修回日期:2020-03-03
资助项目:国家自然科学基金(71663017); 湖北民族大学博士启动金资助项目(4158002)
第一作者:刘恒(1995—),男,湖北钟祥人,硕士研究生,研究方向为资源环境评价与管理。E-mail:zxlh0601@163.com
通信作者:汤弟伟(1987—),男(土家族),湖北建始人,博士,讲师,主要从事资源环境评价与管理研究。E-mail:jstdw@163.com