摘要
[目的]通过监测黄河流域农牧交错区退耕还林还草工程实施前后植被覆盖时空变化规律,为该地区生态恢复和可持续生态建设提供理论依据。[方法]以1990—2020年遥感影像为基本数据源,利用像元二分模型估算研究区植被覆盖度,运用岭回归函数分析植被覆盖度变化趋势,采用Hurst指数预测植被覆盖度变化趋势。[结果]黄河流域农牧交错区年均植被覆盖度由1990年的30.05%增加至2020年的49.19%,增速为0.62%/a(P<0.05)。退耕还林还草工程实施以后,恢复面积增加至53.11百分点。Hurst指数在0.75<H≤1.00的区域范围面积占研究区域95%以上。[结论]黄河流域农牧交错区植被覆盖度恢复面积远大于退化面积,植被整体呈恢复状态,且今后一段时间仍然保持恢复趋势。整体来看,黄河流域农牧交错区植被覆盖度不同等级土地面积发生转移的区域主要由低植被覆盖度向中低、中等植被覆盖度转移。生态工程的实施对黄河流域农牧交错区植被生长具有明显促进作用。
[Objective]To provide a theoretical basis for ecological restoration and sustainable ecological construction in the Yellow River Basin by monitoring the temporal and spatial changes of vegetation cover before and after the implementation of the project of returning farmland to forest and grassland in the farming pastoral ecotone.[Method]Using remote sensing images from 1990 to 2020 as the basic data source,the vegetation coverage in the study area was estimated by pixel dichotomy model,the change trend of vegetation coverage was analyzed by ridge regression function,and the change trend of vegetation coverage was predicted by Hurst index.[Result]The average annual vegetation coverage in the agro-pastoral ecotone of the Yellow River basin increased from 30.05%in 1990 to 49.19%in 2020,with a growth rate of 0.62%/a(P<0.05).After the implementation of the project of returning farmland to forest and grassland,the area recovered increased to 53.11 percentage points.The area of areas with 0.75<H≤1.00 accounts for more than 95%of the study area.[Conclusion]The restoration area of fractional vegetation coverage in the agro-pastoral ecotone of the Yellow River Basin is much larger than the degraded area,and the vegetation is in a state of restoration as a whole,and will maintain the trend of different grades of land areas in the agro-pastoral ecotone of the Yellow River Basin shifted mainly shifted from low vegetation coverage to medium-low and medium fractional vegetation coverage.The implementation of ecological engineering has a significant role in promoting vegetation in the agro-pastoral ecotone of the Yellow River Basin.
作者
付镇
张志敏
苏娟
张变第
卞莹莹
FU Zhen;ZHANG Zhi-min;SU Juan(School of Agriculture,Ningxia University,Yinchuan,Ningxia 750021)
出处
《安徽农业科学》
CAS
2023年第4期44-49,共6页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金青年基金项目(71904093)。
