切根施肥对羊草茎叶功能性状及羊草草原植物群落的影响

Effects ofCutting Root Fertilization on Functional Traits of Stem and Leaf of Leymus chinensis and Plant Communities of Leymus chinensis Steppe

以河北张家口市塞北管理区羊草(Leymus chinensis)草甸草原为研究对象,运用9YCQSB-3.0型退化草地切根施肥补播机进行了切根施肥处理。通过分析羊草茎叶功能性状、主要植物种群高度和地上生物量、植物功能群和群落地上生物量、群落植被盖度以及群落植物种数量的变化,研究了切根施肥对羊草草原植物群落的影响。结果表明:①切根+复合肥、切根+尿素、切根+磷酸二铵均能在不同程度上改良羊草植株的茎叶功能性状;②切根+尿素处理后,羊草种群高度、羊草种群地上生物量、群落植被盖度和群落地上生物量均有显著增加(P<0.05),群落地上生物量最高时为627.12 g/m^(2),增幅达到95.72%;③对羊草草原的改良效果依次为切根+尿素>切根+磷酸二铵>切根+复合肥>切根。

In this paper,the Leymus Chinensis meadow steppe in Saibei Management Area of Zhangjiakou City,Hebei Province was taken as the research object,and the 9YCQSB-3.0 root cutting fertilizing machine was used for rootcutting fertilizing treatment.The effects of root cutting and fertilization on plant communities in Leymus Chinensis steppe were studied by analyzing the changes of stem and leaf functional traits,the height and aboveground biomass of main plant populations,the aboveground biomass of plant functional groups and communities,the vegetation coverage of communities and the number of plant species in communities.The results showed that:①Root cutting+compound fertilizer,root cutting+urea and root cutting+diammonium phosphate could improve the functional traits of stem and leaf of Leymus chinensis to different extent.②After root cutting+urea treatment,the population height,aboveground biomass,community vegetation coverage and community aboveground biomass of Leymus chinensis were significantly increased(P<0.05),and the highest aboveground biomass of the community was 627.12 g/m^(2),with an increase of 95.72%.③The comprehensive improvement effect on Leymus chinensis grassland was in the order of root cutting+urea>root cutting+diammonium phosphate>root cutting+compound fertilizer>root cutting.