Analysis of weed community succession and its driving factors in corn fields in oasis irrigation areas in Xinjiang
To clarify the succession and causes of weed community changes in corn fields in oasis irrigation areas of Xinjiang,a survey was conducted using an inverted"W"nine-point sampling method in 2023 across eight major corn-growing counties and cities in five prefectural regions of Xinjiang.The weed population succession between the two time points(2018 and 2023)and different planting patterns(from non-mulch to film mulch planting)were analyzed.The results showed that Echinochloa crus-galli and Oxybasis glauca have consistently been the abundance weeds in these corn fields in different years and under different planting patterns.Their comprehensive dominance always ranked in the top two,with values of 15.30,18.52 and 12.03,11.54,respectively.Both the Margalef and Shannon-Wiener indices for the weed community in 2023 were higher than those in 2018,particularly,the species and infestation levels of Poaceae weeds gradually increased.In 2018,there were only three species of gramineous weeds(Echinochloa crus-galli,Setaria viridis,and Eleusine indica)with a relative advantage greater than 1,while in 2023,there were 5 species,including new additions such as Eragrostis pilosa,Phragmites australis.Notably,the occurrence of Convolvulus arvensis and Descurainia sophia is more serious,and become dominant weeds with increasing relative abundance from 4.87 and 3.18 in 2018 to 6.96 and 6.47 in 2023.Compared to non-mulched planting,the total density of weeds in mulched corn fields is significantly lower,while the Shannon-Wiener index,Margalef index,and evenness index are all higher than those under non-mulched planting pattern.The comprehensive analysis indicated that the succession of weed communities in corn fields in Xinjiang's oasis irrigation areas is primarily influenced by factors such as cultivation modes of corn(e.g.,film mulch planting with drip irrigation,non-mulched planting with drip or flood irrigation),type of herbicides,and their application methods and frequencies.
oasis irrigation areas of Xinjiangcorn fieldsweed communitysuccessiondriving factors
NETL
NSTL
万方数据
