【摘要】 <正> 植物残体的分解速率,是评价植物残体在保持和改善土壤有机质状况方面的作用,以及估计土壤对农业废物的处理能力等方面所必需的资料。它决定于植物物质的化学组成和分解的环境条件,因此欲获得这方面可靠的资料,试验条件必须尽可能逼近田间实际情况。早期有关这方面用非标记物料的实验室研究,其水热状况与田间迥异;用塑料纱袋法更多还原

【Abstract】 Interference by living plant roots is usually found in decomposition studies with no labelled plant materials carried out under field conditions. It has been found that this interference can be completely eliminated by using porous carborundum tubes with pore size, mainly of 140μ×70μ, as the containers for soil and plant material being examined, and the hydro-thermal conditions of the soil inside the tube was identical with or approximate to that outside the tube under submerged and upland conditions respectively.Since it was found that the proportion of addition of plant material within the range of 1—8% of soil didn’t affect their decomposition rate under submerged conditions, it is recommended that, in decomposition studies with soils containing 1—2% organic matter, 8% plant materials may be added in order to obtain more reliable results.更多还原