摘要
为了探讨种植甘草(Glycyrrhiza Uralensis)对农田风蚀、土壤质地及碳、氮含量的影响,试验以甘草和其下部土壤为研究对象,通过测定不同生长年限甘草植被的盖度、高度、地上生物量和土壤表层(0—5cm)的风蚀量、质地及有机碳、全氮含量,来探索甘草植被性状特征对土壤质地和碳、氮含量的影响以及它们之间的数量关系。结果表明,随着甘草生长年限的增加,甘草植被的盖度、高度、生物量和土壤表层的黏粉粒、极细沙、有机碳、全氮含量呈显著提高趋势,而地表风蚀量呈显著减小趋势(P<0.05);相关分析显示,甘草植被的盖度、高度、生物量与表层土壤中的黏粉粒、极细沙、有机碳、全氮含量间表现出极显著的正相关关系(P<0.01);回归分析显示,当甘草植被的地表生物量每提高1g,可使表层土壤中的黏粉粒含量提高0.048 9%,土壤有机碳、全氮含量提高0.012g/kg和0.001 1g/kg;当耕地表层土壤中的黏粉粒含量每提高1%,可使土壤有机碳、全氮含量提高0.220 3g/kg和0.018 5g/kg。西北风蚀区农田若种植甘草,可减弱耕地表层风蚀危害,提高表层土壤中的细小颗粒物比例和土壤有机碳、氮含量,有利于土壤肥力的恢复和改善。
To explore effects of liquorice（Glycyrrhiza Uralensis）plantation on soil erosion,texture and contents of organic carbon（OC）and total nitrogen（TN）through measuring vegetation coverage,height aboveground biomass and topsoil（0-5cm）erosion,texture,nutrient conservation under cover,analysis was done of the liquorice vegetation for characteristic indices and of the topsoil texture and nutrients.Results showed that with the liquorice vegetation growing on,coverage,height and biomass of the vegetation,and silt＋clay,very fine sands,OC and TN in the topsoil all significantly increased,while wind erosion significantly decreased（P0.05）.Correlation analysis indicated that characteristic indices were significantly and positively related to soil silt＋clay,very fine sands,OC and TN contents（P0.01）.Regression analysis demonstrated that for every 1g of increase in biomass,the content silt＋clay,OC and TN in topsoil increased 0.048 9%,0.012g/kg and 0.001 1g/kg;for every 1% of increase in topsoil silt＋clay,the content of OC and TN increased 0.220 3g/kg and 0.018 5g/kg,respectively.Obviously,the adoption of practice of planting liquorice on farmland of wind erosion of Northwest China,may reduce wind erosion of the surface soil,and increase the amount of fine particulate matter and hence content of OC and TN,and soil fertility could be recovered and improved.
出处
《水土保持学报》
CSCD
北大核心
2016年第5期286-290,296,共6页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(31560185)
兰州城市学院校长科研创新基金项目(LZCU-XZ2014-02)
关键词
植被覆盖
风蚀
土壤质地
土壤养分
甘草
vegetation coverage
erosion
soil texture
soil nutrient
Glycyrrhiza Uralensis
