草业学报2025，Vol.34Issue(2)：109-122,14.DOI:10.11686/cyxb2024129
植物生长中期施肥对草甸草原群落特征与物种多样性的影响
Effects of fertilizer application during mid-growing season on vegetation community biomass and species diversity in meadow grasslands
摘要
Abstract
Appropriate nutrient addition can improve grassland productivity and stability,but the effects of adding different amounts of nutrients on large-scale grassland communities are unclear.In this study,fertilization experiments were carried out in a field experiment on mildly degraded natural mowed grassland in Hulunbuir with a total area of 182673 m2.Urea granules,calcium superphosphate granules,and potassium sulfate granules were used to supply nitrogen(N),phosphorus(P),and potassium(K),respectively.Three nutrient addition treatments(A,B,C)and a control(CK)were established.The application rates of N,P2O5,and K2O were 2.3,1.2,and 0.75 g·m-2,respectively,in treatment A;4.6,2.4,and 1.5 g·m-2,respectively,in treatment B;and 6.9,3.6,and 2.3 g·m-2,respectively,in treatment C.No fertilizer was applied to the CK.The fertilizers were applied twice,once in mid-July and once in early August 2022 in the middle of the growing season.We compared the effects of these fertilization treatments on the characteristics of grassland communities.The results showed no synergistic effect of the treatments on the productivity and species diversity of the grassland.Treatment A did not significantly affect the community biomass,but significantly increased the community richness index.The community biomass was 201.73 g·m-2 in CK,and was higher in treatment B(319.19 g·m-2)and treatment C(328.52 g·m-2),although the community species diversity did not differ significantly between CK and treatments B and C.Treatments B and C significantly increased the biomass of dominant species and perennial bunch grasses.Treatment B significantly increased the biomass of perennial forbs.The increase in community biomass in treatments B and C was associated with increases in community species height and density.Treatments A,B,and C significantly enhanced the carbon,N,and P contents in the community.The contents of carbon,N,and P in the communities in treatments A,B,and C were all significantly and positively correlated with community biomass.In conclusion,fertilization mitigates the effects of nutrient-limiting factors on plant growth and enhances community biomass by increasing the biomass of key species in the community.关键词
呼伦贝尔草原/物种多样性/草地生产力/化学计量比/植物功能群/群落成员型Key words
Hulunbuir grassland/biodiversity/grassland productivity/stoichiometric ratio/plant functional group/community members引用本文复制引用
吕娜,杨雪,高吉喜,李政海,尤春赫,刘晓曼,张彪,莫宇,朱萨宁,彭阳..植物生长中期施肥对草甸草原群落特征与物种多样性的影响[J].草业学报,2025,34(2):109-122,14.基金项目
国家重点研发计划项目(2022YFF1303403)资助. （2022YFF1303403）
