SHI Zhiyu,ZHAO Qing,WANG Yating,et al.Temporal and Spatial Evolution of Vegetation Cover and Its Relationship with Runoff in Yihe River Basin[J].Research of Soil and Water Conservation,2023,30(01):54-61.[doi:10.13869/j.cnki.rswc.20220601.002]
沂河流域植被覆盖时空演变及其与径流的关系研究
- Title:
- Temporal and Spatial Evolution of Vegetation Cover and Its Relationship with Runoff in Yihe River Basin
- 文章编号:
- 1005-3409(2023)01-0054-08
- Keywords:
- NDVI; change trend; SCS model; correlation; Yihe River Basin
- 分类号:
- P339; S715.3
- 文献标志码:
- A
- 摘要:
- 为探求沂河流域植被覆盖时空演变特征及其与地表径流的关系,基于MOD13Q1 NDVI遥感影像数据,利用趋势分析方法,分析了2000—2020年沂河流域植被覆盖时空演变特征,并利用SCS模型模拟地表径流深,使用相关分析在像元尺度上分析了植被NDVI变化与径流的关系。结果表明:(1)沂河流域20年间植被NDVI呈波动增加趋势,流域内NDVI空间分布差异较大,NDVI增加的区域主要分布在流域北部,NDVI减少的区域主要分布在流域东部和南部及各城镇建成区内;(2)沂河流域不同时期径流深均呈现出不同程度的由西北向东南逐渐增加趋势,径流深出现较大幅度波动,径流存在明显的丰枯变化;(3)流域NDVI和地表径流之间呈正相关和负相关共存的相关关系,以不显著正相关为主,呈显著正相关的区域主要集中在流域北部,显著负相关区域主要集中在流域南部兰山区境内。研究表明,沂河流域整体植被覆盖得到了改善,但流域内部植被变化存在分异,植被保护与修复主要集中在北部,而南部与东部地区随着人类活动的增加,NDVI出现一定程度减少。随着流域内不同空间位置NDVI的增加及减少,径流主要呈增加趋势且两者相关关系在小空间尺度下存在明显差异。
- Abstract:
- In order to explore the temporal and spatial evolution characteristics of vegetation cover and its relationship with surface runoff in Yihe River Basin, based on MOD13Q1 NDVI remote sensing image data, the temporal and spatial evolution characteristics of vegetation cover in Yihe River Basin from 2000 to 2020 were analyzed by trend analysis method, the surface runoff depth was simulated by SCS model, and the relationship between vegetation NDVI change and runoff was analyzed by correlation analysis on pixel scale. The results showed that:(1)the NDVI of vegetation in Yihe River Basin increased in a fluctuating trend in the past 20 years, and the spatial distribution of NDVI in the basin was quite different; the areas where NDVI increased mainly distributed in the north of the basin, and the areas where NDVI decreased mainly distributed in the east and south of the basin and urban built-up areas;(2)the runoff depth of Yihe River Basin in different periods showed a gradual increasing trend from northwest to southeast in varying degrees, the runoff depth fluctuated greatly, and the runoff had obvious changes of high and low seasons;(3)there was a coexistence of positive correlation and negative correlation between NDVI and surface runoff, which was mainly insignificant positive correlation; the areas with significant positive correlation mainly concentrated in the north of the basin, and the areas with significant negative correlation mainly concentrated in Lanshan District in the south of the basin. This research shows that the overall vegetation coverage in Yihe River Basin has been improved, but there are differences in vegetation changes in the basin. Vegetation protection and restoration mainly concentrate in the north, while NDVI decreases to a certain extent in the south and east with the increase of human activities. With the increase and decrease of NDVI in different spatial locations in the basin, the runoff mainly shows an increasing trend, and the correlation between them is obviously different on a small spatial scale.
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备注/Memo
收稿日期:2021-09-25 修回日期:2021-11-12
资助项目:国家自然科学基金项目(41701025); 江苏师范大学研究生科研创新计划项目(2021XKT0065)
第一作者:石智宇(1998—),男,江苏徐州人,硕士研究生,研究方向为土地利用与生态环境。E-mail:1412964093@qq.com
通信作者:赵清(1965—),男,江苏盐城人,教授,博士,主要从事景观生态与土地利用研究。E-mail:zhaoqingl@163.com