毕节林地景观格局时空变化特征分析

Analysis of Spatiotemporal Changes in Forest Landscape Pattern in Bijie

掌握林地景观格局时空变化特征,对于以林为主的山水林田湖草沙规划具有重要意义。基于遥感影像解译获取贵州省毕节市1990—2020年4期林地景观数据,对研究区林地景观格局演变特征及其规律进行分析。结果表明:近30年来,毕节林地景观面积及景观格局均发生了较大变化,林地景观受人为因素和政策影响较大,林地景观面积总体呈减少趋势,但林地景观的质量持续增加。从林地二级地类来看,毕节灌木林地面积占比最大、总体呈减少趋势,有林地、疏林地和其他林地面积总体增加,林地主要转为耕地、草地。毕节林地景观破碎化程度有少量增加,景观异质性逐渐增大,不同景观斑块在空间上趋于离散,反映出近30年来毕节林地受人类活动干扰较为严重。

Mastering the spatiotemporal changes in forest landscape patterns is of great significance for the planning of mountains,rivers,forests,fields,lakes,grasslands,and sands,which are mainly dominated by forests.Based on remote sensing images interpretation,we obtain four periods of forest landscape data in Bijie,Guizhou province from 1990 to 2020,and analyze the characteristics and laws of forest landscape pattern evolution in the study area.The results indicated that:In the past 30 years,the forest landscape area and pattern in Bijie had undergone significant changes.The forest landscape was greatly influenced by human activities and policies,and the overall forest landscape area showed a decreasing trend,but the quality of the forest landscape continued to increase.From the perspective of secondary land types of forest land,the proportion of shrub forest land in Bijie was the largest,and the overall trend was decreasing.There as an overall increase in the area of forest land,sparse forest land,and other forest land,with forest land mainly turning into farmland and grassland.The degree of fragmentation of the Bijie forest landscape has slightly increased,and the heterogeneity of the landscape had gradually increased.Different landscape patches tended to disperse in space,reflecting that the Bijie forest had been severely disturbed by human activities in the past 30 years.