煤矸石土壤调理剂对毛乌素沙地柳枝稷生长的影响

Effects of Coal Gangue Soil Conditioner on Growth of Switch Grass in Mu Us Sandy Land

提高毛乌素沙地保水保肥性能,旨在为黄河“几”字弯生态保护与高质量发展提供理论支持。为了探究煤矸石对毛乌素沙地的改良效果,以柳枝稷为指示作物,采用随机区组设计,设置煤矸石土壤调理制剂含量分别为0%(CK)、90%(ST1)、84%(ST2)、78%(ST3)、66%(ST4)、54%(ST5),研究不同煤矸石含量的土壤调理剂对毛乌素沙地土壤性质和柳枝稷农艺指标的影响。结果表明,添加煤矸石土壤调理制剂可有效改善风沙土物理结构。其中,与CK相比,ST1处理含水率提高最多,增加41.36%;ST3处理土壤容重较CK降低最多,降低19.91%;ST4处理对风沙土孔隙度的提升最为显著,相比CK增加5.31%。煤矸石土壤调理制剂促进了沙地柳枝稷生长。与CK相比,施用煤矸石土壤调理制剂能够显著提高柳枝稷株高,其中,ST4处理对柳枝稷的株高增长效果最为显著,较CK增长54.3%;ST2处理则对柳枝稷地上生物量提升效果最为显著,ST3处理对地下生物量提升最显著,相比CK分别增长57.26%、31.47%。主成分分析结果表明,与CK相比,煤矸石土壤调理制剂处理组得分以ST2最佳,得分为0.40。因此,改善毛乌素沙地土壤性质的最佳煤矸石土壤调理制剂含量为84%。

The purpose of improving the water and fertilizer retention performance of Mu Us Sandy Land is to provide theoretical support for the ecological protection and high-quality development of the"Ji"bend of the Yellow River.In order to explore the improvement effect of coal gangue on Mu Us Sandy Land,in this study,switch grass was taken as the indicator plant,and the content of soil conditioners of coal gangue was set to 0%(CK),90%(ST1),84%(ST2),78%(ST3),66%(ST4),and 54%(ST5)by random block method.The effects of soil conditioners with different coal gangue content on soil properties and agronomic indexes of switch grass in Mu Us Sandy Land were studied.The results showed that adding coal gangue soil conditioners could effectively improve the physical structure of aeolian sand soil.Among them,compared with CK,under ST1 treatment,water content increased the most,by 41.36%.The bulk density of soil under ST3 treatment decreased by 19.91%compared with CK.ST4 treatment had the most significant improvement on the porosity of aeolian sand soil,the value increased by 5.31%compared with CK.The soil conditioners of coal gangue promoted the growth of switch grass on sandy land.Compared with CK,the application of coal gangue soil conditioners could significantly increase the plant height of switch grass.Among them,ST4 treatment had the most significant increase effect on the plant height of switch grass,it increased by 54.3%compared with CK;ST2 treatment had the most significant increase effect on the aboveground biomass of switch grass and ST3 treatment had the most significant increase effect on the underground biomass,compared with CK,the increase of the biomass was 75.60%and 83.17%,respectively.Principal component analysis showed that ST2 had the best score in the treatment groups of coal gangue soil conditioners compared with CK,and the score was 0.40.Therefore,the best proportion of coal gangue soil conditioner to improve soil properties in Mu Us Sandy Land was 84%.