秦岭北麓地区替代性成土材料的土壤养分对比研究

Comparative study on soil nutrients of alternative soil materials in the northern foot of Qinling Mountains

针对秦岭北侧山前冲积扇地区不适宜农业种植的条件,科学合理完成替代性成土材料试验,可为土体有机重构提供科学依据。设计出不同的替代性成土材料,如蛭石、页岩、珍珠岩、陶砾、沙、砒砂岩六种材料与土以0.5L·m^(-2)和1L·m-2的比例混合,在2m×3m的试验田里种植大豆,对种植大豆后的土壤养分进行试验分析。发现六种成土材料的养分整体含量较低,有机质及全氮含量在0~30cm土层中均随着深度的增加而减小;0.5L·m-2比1L·m-2养分含量高,更适宜大豆的生长,且在0.5L·m-2的配比条件下,页岩及蛭石最有利于大豆的生长。各土壤养分综合比较,全氮及有机质是导致秦岭北麓地区养分指标含量较低的主要原因,提高土壤中全氮及有机质含量是提高本地区土壤养分的最直接方式。

In the light of the unsuitable conditions for agricultural planting in the alluvial fan area on the north side of Qinling Mountains,the experimental stage of the replacement of soil forming materials is completed reasonably and scientifically.It is an important support for the scientific demonstration of soil organic reconstruction.In the design,different alternative soil materials,such as vermiculite,perlite,clay shale,gravel,sand,Pisha sandstone,mix with soil at the ratio of 0.5 L·m^(-2) and 1 L·m-2,and grow soybeans in the 2 m×3 mtest field.The soil nutrient was investigated and analyzed after soybean planting for a period of time.The results showed that the overall nutrient content of the six kinds of soil forming materials was low,and the contents of organic matter and total nitrogen decreased with the increase of depth;The nutrientcontent of 0.5 L·m-2 is higher than 1 L·m-2,which is more suitable for soybean growth,and at the ratio of 0.5 L· m-2,the shale and vermiculite are most conducive for the growth of soybean.After a comprehensive comparison of the soil nutrient,total nitrogen and organic matter was mainly lead to the low content of nutrients in the north region of Qinling Mountains,so improve the soil total nitrogen and organic matter content is the most direct way to improving the soil nutrient in the region.