施加有机物料对土壤有机质影响的研究

研究结果证明，有机物料的矿化速度在绵土中，牛粪>麦草>玉米秆>草术樨；在塿土中，牛粪>玉米秆>麦草。各类还田有机物的腐殖化系数，在绵土中玉米秆为0.25，麦草为0.25，草木樨为0.26，牛粪为0.21，在塿土中玉米秆为0.35，麦草为0.37，牛粪为0.31。施入物料后土壤有机质的累积与物料的矿化速度和施后时间呈负相关，与加入有机物量呈正相关。文中计算了本地区维持土壤耕层一定的有机质水平，每亩耕地每年需加入有机物料的数量。

The Effect of Application of Organic Substances Upon Soil Organic Matter

Results obtained from this experiment showed that the mineralized speeds of organic substances were Catte waste >Wheat straw >Corn stalk >Sweet clover in Huang Mian Soil and were Cattle waste >Corn stem >Wheat straw in Lou Soil.Humification coefficient of various organic substances incorporated into the soil were Corn stem 0.25, Wheat straw 0.25, Sweet clover 0.26, Cattle waste 0.21 in Huang Mian soiland corn stem 0.35, Wheat straw 0.37, Cattle waste 0.31 in Lou Soil.After application organic substances, amounts of soil organic matter accumulation and the mineralized speeds of organic substances decrease with the prolongation of the time.Amounts of soil organic matter accumulation showed signiicant positive correlation with amounts of application of organic substances into soil.Based on the exrerimental results, the suggestion in how many amounts of organic substances need to apply into soils every year if they want to maintain a certain fixed organic matter horizon were put forward.