Weed Species Diversity and Influencing Factors in Citrus reticulata Orchards of Guangxi Zhuang Autonomous Region
Weed community structure was systematically investigated in 44 Citrus reticulata orchards in Nanning City,Liuzhou City and Guilin City of Guangxi Zhuang Autonomous Region.The results showed that there were 68 species of weeds belonging to 37 families and 65 genera in C.reticulata orchards of Guangxi producing areas.According to the importance value of species,the weeds with importance value more than 1％were determined as dominant weeds.The species included Digitaria sanguinalis,Bidens pilosa,Eleusine indica,Commelina communis,Spermacoce alata,Echinochloa crusgalli,Alternanthera philoxeroides,Solanum nigrum,Ageratum conyzoides,Amaranthus blitum,Acalypha australis,Oxalis corniculata,Setaria viridis,Cyperus iria,Ipomoea obscura,Persicaria lapathifolia,Richardia scabra,Centella asiatica,Cynodon dactylon,Causonis japonica and Commelina diffusa.Among them,B.pilosa,E.indica,E.crusgalli and A.philoxeroides were more serious malignant weeds in C.reticulata producing areas of Guangxi.Through CCA,it was found that the weed community structure in C.reticulata producing areas of Guangxi was mainly affected by environmental factors such as annual average precipitation,annual average temperature,latitude and longitude,and altitude.This study clarified the weed community structure and occurrence status in producing areas of Guangxi Zhuang Autonomous Region,which is of great significance to guide the scientific prevention and control of weeds in C.reticulata orchards.
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