提高作物单位面积产量的一项技术措施就是增加种植密度。尽管随着种植密度的增加,单株产量会下降,但群体冠层的总受光量却达到了最大值,总产量增加。单位面积的籽粒产量与密度增加呈抛物线形反应(Karlen 和Camp,1985)。较高的种植密度籽粒产量降低,其原因在于不结实穗增加(Buren 等,1974等),单穗籽粒数减少(Iremiren 等, A technical measure to increase the yield per unit area of ​​crops is to increase planting density. Although the yield per plant decreased with the increase of plant density, the total amount of light received by the canopy reached the maximum, and the total yield increased. The yield and density of grain per unit area showed a parabolic response (Karlen and Camp, 1985). Decreased grain yield at higher plant density due to increased spikelets (Buren et al., 1974), decreased number of single spikelets (Iremiren et al.