Analysis of the dominance and niche of aphids at the wheat earing stage in Langfang,Hebei province
By field survey and analyzing the main aphid species and their niches at the wheat earing stage in North China,this study aimed to provide a technical support for the prediction system and scientific prevention and control of wheat aphids in Beijing-Tianjin-Hebei region.We used five-point sampling and chessboard sampling methods to investigate the species,dynamics and position of wheat aphid on plants at the earing stage of wheat in Langfang.The niche theory was used to calculate the niche width and overlap of three wheat dominant aphids,Sitobion miscanthi(Takahashi),Rhopalosiphum padi(Linnaeus)and Metopolophium dirhodum(Walker).R.padi had the widest temporal-spatial niche,followed by S.miscanthi and M.dirhodum.The niche width of R.padi showed an upward trend with time,while the other two aphid species showed a downward trend.Niche overlap existed between different aphid species:R.padi and S.miscanthi had the largest overlap(2.073 0),and S.miscanthi and M.dirhodum had the lowest overlap(1.656 4).With the passage of time,the competition between S.miscanthi and R.padi tended to intensify,and the competition between R.padi and M.dirhodum tended to weaken,while the competition between S.miscanthi and M.dirhodum was relatively stable.SS.miscanthi was the main dominant species of local wheat aphids.The temporal-spatial niche width of R.padi was the largest,and its competition with S.miscanthi was fierce.The temporal-spatial niche of M.dirhodum was relatively stable.
万方数据
维普
