Weed Species and Community Characteristics in Major Pomegranate Orchards in Nanyang
To scientifically and rationally control and utilize weeds in pomegranate orchards,we surveyed weed species and community characteristics in major pomegranate orchards of Nanyang via an inverted"W"9-point sampling method in 2023.The results showed that there were 55 species of weeds belonging to 54 genera in 26 families in pomegranate orchard of Nanyang,with the majority of Asteraceae,Poaceae,and Brassicaceae.The dominant weeds included Capsella bursa-pastoris,Taraxacum mongolicum,Cyperus rotundus L.,and Digitaria sanguinalis ( L.) Scop..In terms of the regional distribution of weed,Shigang Town in Neixiang County not only existed diversity but also a relative uniformity,with 53 weed species,a richness index of 13.1402,and an evenness index of 0.8672.According to the Shannon Wiener index of Jiuchong Town reached 3.4720,indicating that the community species diversity in this area was the richest.The Simpson indexes of all 5 pomegranate orchards were above 0.9,indicating that the dominant weed species in these 5 pomegranate orchards were concentrated and distributed similarly.Hierarchical cluster analysis of weeds with a relative advantage of≥1 showed that weeds in Nanyang area were classified into 3 groups.The weed community structures in Shengwan Town,Jiuchong Town,and Shigang Town were relatively similar,belonging to the first group.These regions are mountainous terrain,and Shengwan Town and Jiuzhong Town are both close to the water source region of the middle route of South-to-North Water Diversion Project,the dominant weeds were C.bursa-pastoris+T.mongolicum+D.sanguinalis ( L.) Scop.+Cyperus rotundus L.+Trigonotis peduncularis ( Trevis.) Benth.ex Baker & S.Moore+Portulaca oleracea L.+Stellaria media ( L.) Vill..Shifosi Town in Zhenping County was the second group,mainly consisting of hilly areas,the dominant weeds were C.bursa-pastoris+T.mongolicum+D.sanguinalis ( L.) Scop.+C.rotundus L.+Amaranthus tricolor L.+Humulus scandens ( Lour.) Merr..Angao Town in Wolong District was the third group,mainly consisting of partially hilly area and plain,the dominant weeds were C.bursa-pastoris+T.mongolicum+D.sanguinalis ( L.) Scop.+C.rotundus L.+Geranium carolinianum L.+Veronica polita Fries+Commelina communis L.+Malva pusilla Sm..In terms of production,it is recommended to combine cultivated and natural grass growth,and use mechanical mowing to control the height and density of weeds within a certain range,maximizing the positive effects of weed control.
万方数据
维普
