近20年杭锦旗植被覆盖变化特征及驱动力分析

doi:10.19741/j.issn.1673-4831.2020.0307

摘要/Abstract

摘要： 以MOD13Q1为数据源，采用固定起始年份，逐步增加结束年份的分析方法并辅以Sen+Mann-Kendall趋势、Hurst指数等方法，探究杭锦旗2000-2017年植被覆盖变化特征及驱动力。结果表明：（1）杭锦旗植被覆盖由北向南空间分布格局呈"高低高"特征。随着研究时段的延长，归一化植被指数（NDVI）显著改善面积呈先增加后减少趋势，退化面积则表现为先减少后增加；（2）不同土地利用类型NDVI均值由大到小依次为耕地、有林地、灌丛、草地和沙地，18 a间有林地、灌丛和草地NDVI增速显著，沙地最低；（3）研究区未来NDVI主要变化趋势表现为退化，占比为57.93%，需进一步精准施策，加强该地区生态保护力度；（4）降水对NDVI的作用以正效应为主，而温度以负效应为主且相关性随时段延长而降低，人类活动对NDVI影响则具有双重效应；（5）各阶段驱动力逐渐复杂化，气象要素和人类活动共同作用对NDVI影响更为显著。

关键词: 杭锦旗, MODIS-NDVI, 植被覆盖, 变化趋势, 驱动力

Abstract: Using MOD13Q1 as the data source, by adopting the analysis method of fixed starting year and increased ending years, and supplemented by Sen+Mann-Kendall slope method and Hurst index methods, the characteristics and driving forces of the changes of vegetation cover in Hangjin County from 2000-2017 was investigated. The results show that: (1) the spatial distribution pattern of vegetation cover in Hangjin County showed "high-low-high" trend from north to south; a greening-browing trend was observed in the significantly increased area of normalized difference vegetation index (NDVI), while the degraded area had a first downward and then upward trend; (2) the mean NDVI value presented an order: agricultural land > forest > shrub > grassland > sandland under the different land use types, and the increase rate of NDVI in forest, shrub and grassland was significant while sandy land was the lowest; (3) the main trend of NDVI in the study area is degradation, accounting for 57.93% of the total area of the Hangjin County, and precise measures should be taken to strengthen ecological protection in this region; (4) precipitation had a positive effect on NDVI, whereas temperature did not promote vegetation grown and the correlation decreased with time period lengthening; and human activities had a dual effect on NDVI; (5) the driving forces of each period exhibited a complicated status gradually, and the interactions of climate variations and human activities had significant effects on NDVI.

Key words: Hangjin County, MODIS-NDVI, vegetation cover, change trend, driving force

中图分类号:

X171

何亮, 梁海荣, 李钢铁, 刘雪锋, 齐容镰, 杨文斌. 近20年杭锦旗植被覆盖变化特征及驱动力分析[J]. 生态与农村环境学报, 2021, 37(5): 587-596.

HE Liang, LIANG Hai-rong, LI Gang-tie, LIU Xue-feng, QI Rong-lian, YANG Wen-bin. Analysis on the Characteristics of Changes and Driving Forces of Vegetation Cover in Hangjin County in Recent 20 Years[J]. Journal of Ecology and Rural Environment, 2021, 37(5): 587-596.

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