混掺小麦秸秆对不同土壤育苗砖蒸发的影响

育苗砖能为植物营造一个良好的生长环境,引导植物根系的发育和生长,且苗的移栽不受时间限制。对红黏土、黄绵土、山地白土和黑麻土分别添加0%,5%,8%和10%的小麦秸秆后制得育苗砖,并对其进行蒸发试验。在相同土壤下测得它们蒸发量大小顺序为:混掺0%小麦秸秆的育苗砖>混掺5%小麦秸秆的育苗砖>混掺8%小麦秸秆的育苗砖>混掺10%小麦秸秆的育苗砖。结果表明,混掺小麦秸秆对育苗砖蒸发影响显著,而且秸秆混掺比例越大蒸发量越小,故添加秸秆可有效减少育苗砖的蒸发损失。混掺相同比例小麦秸秆的不同土壤育苗砖,蒸发量大小顺序为:红黏土育苗砖>黑麻土育苗砖>山地白土育苗砖>黄绵土育苗砖。综合分析来看,混掺10%小麦秸秆的黄绵土育苗砖蒸发损失最小。

Effect of Blended Wheat Straw on Evaporation of Seeding Bricks with Different Soils

Seeding brick can create a good living environment and guide the development and growth of plant roots. Moreover, Seedlings can be transplanted without time limit. Seeding bricks were made of red clay, loess, and white and black soils blended with 0%, 5%, 8% and 10% wheat straw and evaporation experiment was then conducted for the bricks. In terms of the evaporation measured for the same soil, the seeding bricks were in the order of seeding brick with 0% wheat straw > seeding brick with 5% wheat straw > seeding brick with 8% wheat straw > seeding brick with 10% wheat straw. Results showed that the wheat straw content affected the evaporation of the seeding bricks significantly. The more wheat straw content, the smaller evaporation was. Therefore, adding wheat straw could reduce evaporation loss of the seeding bricks. In terms of the evaporation, the seeding bricks blended with wheat straw of the same percentage but different soils were in the order of red clay brick> black hemp soil brick> mountain white clay brick>loessal soil brick. However, the differences between them were little. Comprehensively, the evaporation loss of loessal soil seeding brick with 10% wheat straw was the least.