干旱区研究2026，Vol.43Issue(4)：801-811,11.DOI:10.13866/j.azr.2026.04.12
刈割和施氮对旱雀麦生长繁殖的影响
Effects of clipping and nitrogen application on the growth and reproduction of Bromus tectorum
摘要
Abstract
To reasonably utilize the resources of Bromus tectorum in the Junggar Desert,this study conducted a pot experiment exploring the effects of clipping intensity and nitrogen addition on its growth and reproduction.Three clipping intensities as well as nitrogen addition levels were established,respectively:no clipping(A0),stub-ble height of 7.6 cm(A1),and stubble height of 2.5 cm(A2);along with 0(N0),20(N1),and 40(N2)g·m-2·a-1.The results showed that clipping and nitrogen application significantly extend the growth period and accelerate re-growth of B.tectorum.Under clipping alone,A1N0 extended the growth period by 7 days,and A2N0 accelerated regrowth by 17%;after nitrogen application,A1N1 extended the growth period by 14 days and increased the re-growth rate by 67%.Clipping had no significant effect on growth parameters(P>0.05),whereas nitrogen applica-tion significantly affected plant height,flag leaf length and width,and leaf area(P<0.01).Under the same clip-ping intensity,total biomass increased significantly with increasing nitrogen application rates,with both aboveg-round and belowground biomass showing marked enhancements compared to the control treatment(A0N0).Spe-cifically,the A1N2 treatment elicited significant increases in aboveground and belowground biomass,resulting in a total biomass of 10.28 g.Under the same clipping intensity,seed number and seed weight increased with nitro-gen application rate.Without nitrogen application,A2N0 was greater than A0N0,whereas at nitrogen levels N1 and N2,the A0 treatment was slightly superior to A2.Clipping increased the number of seeds,seed weight,and biomass,with a compensation index greater than 1.Furthermore,nitrogen application enhanced the overcompen-sation growth pattern.Studies indicate that B.tectorum can be used as an early-spring forage for rational grazing,and the optimal treatment for improving its growth and reproduction is 40 g·m-2·a-1.at a 7.6 cm stubble height.关键词
旱雀麦/刈割强度/施氮量/再生速率/繁殖分配/补偿模式Key words
Bromus tectorum/clipping intensity/nitrogen application rate/regrowth rate/reproductive alloca-tion/compensatory growth pattern引用本文复制引用
王海艳,罗霄,郑玉琪,魏岩..刈割和施氮对旱雀麦生长繁殖的影响[J].干旱区研究,2026,43(4):801-811,11.基金项目
国家自然科学基金项目(31560113) （31560113）
