灌叢人侵對黃河三角洲濕地土壤粒徑空間異質(zhì)性特征的影響研究

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中圖分類號：S153.6：Q948 文獻標識號：A 文章編號：1001-4942（2025）06-0111-10

AbstractGlobal changes and human activities induce great shrub encroachments in coastal wetland ecosystems，altering their structures and functions.Taking the typical shrub-encroached wetland in the Yellow River Delta as a case and based on the GIS platform，we quantified the spatial pattern heterogeneity of soil particle composition （ 0～80cm， ）by lacunarity analysis and analyzed the effects of different shrub encroachment types on soil particles by the cold（hot）spot analysis.The results were as folows.（1） The contents of different size soil particles in shrub-encroached wetland showed as silt > sand > clay. The content of clay and silt increased with the increase of soil layer depth while that of sand decreased.（2）The lacunarityof clay was higher than that of silt and sand in 0～20 -cm layer，and they were similar in 20～30 -cm layer. But below ，the lacunarity of clay decreased gradually utill lower than that of silt and sand.（3） The hot-spot area of sand in 0～50 -cm layer occupied the largest in shrub patches，while that of clay in 0～40 -cm layer and silt in 0～50 -cm layer （except 1O＼～2O-cm layer）occupied the largest in tidal flat without shrubs.The hot-spot areas of soils in Tamarix chinensis cluster patches and bare land were moderated.These results could provide scientific references for accurate assessment of wetland shrub-encroached efect and wetland protection and res

toration.

KeywordsWetland shrub encroachment； Soil particle size; Spatial heterogeneity；Lacunarity analysis;Cold-hot spot analysis； Yellow River Delta

由于全球氣候變化和人類活動，天然草本生態(tài)系統(tǒng)逐漸被灌木等木本植物侵占，即發(fā)生灌叢化現(xiàn)象[1-2]。（剩余12091字）