摘要
采用室内盆栽实验,通过对比秸秆覆盖于地表和掩埋到地下20 cm处不同秸秆还田方式对作物生长发育和土壤呼吸的影响,结果表明前者有助于增加作物的根粗和根体积,增强叶片光合作用,提高作物产量;增加土壤微生物数量,促进土壤营养元素的循环和转化;虽然在短期内会增加土壤呼吸作用,出现暂时的高土壤排碳,但是综合考虑土壤排碳和作物固碳的相互作用以及秸秆还田配套的人力物力财力,秸秆覆盖于地表最终有利于生态系统的固碳减排.
In an indoor potted experiment, straw was left on field surface as a mulch or placed under the soil surface at 20 cm to compare the influences of the two ways of straw returning on soil respiration and crop growth. The results showed that the former way helped to increase the root diameter and root volume of the crop, enhance photosynthesis of the leaves, improve crop yield, increase the quantity of soil micro organisms and promote soil nutrient cycling and transformation. In the straw mulch treatment, soil respi-ration increased in a short time and temporary increase in soil carbon emission occurred. However, taking into consideration the interaction between carbon sequestration of soil and crop and the labor and financial cost of the straw returning operation, straw mulching is recommended for its contribution to the ecological system.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第11期43-48,共6页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金资助项目(31271673)
