晋北农牧交错带养分添加和浅耕翻对草地生物量的影响

打开文本图片集

中图分类号：S812.4 文献标识码：A 文章编号：1007-0435（2025）04-1299-09

Abstract：Four treatments，including control，nutrient addition（nitrogen，phosphorus，potassium），shallow tillage （ ）and nutrient addition + shallow tillage，were set up to investigate the effects of different grassland management measures on grassland biomass in the agro-pastoral ecotone of norther Shanxi. The results showed that the above-ground，below-ground，and total biomass increased by 6 8 . 3 2 % ， 2 5 . 7 8 % and 4 1 . 0 4 % ，respectively，under the nutrient addition treatment，while the biomass of all levels decreased by 58 % ， 2 5 . 7 8 % and 4 1 . 0 4 % ，respectively，under the shallow tillage treatment. Nutrient addition + shallow ploughing treatment had no significant effect on biomass，but root-crown ratio increased by 7 6 . 9 6 % .Nutrient addition increased the proportion of perennial biomass； shallow ploughing and nutrient addition + shallow ploughing decreased the proportion of litter biomass and increased the proportion of annual and biennial bio mass.In2O22 with higher precipitation，root-shoot ratio，below-ground biomassand total biomass were signifi cantly higher than those in 2O2l with lower precipitation，emphasizing the important role of interannual precipitationinregulating plant biomass alocation andaccumulation. In conclusion，compared to short-term shallow ploughing management practices， nutrient addition was more beneficial to the grassland productivity improvement grassland in the agro-pastoral ecotone of northern Shanxi.

Key words：Nutrient addition； Shallow ploughing；Agro-pastoral ecotone ； Precipitation； Biomass

中国北方的农牧过渡带连接着东西两侧的牧区和农区，是欧亚大陆典型的生态过渡带[1]。（剩余13950字）