水肥管理对半干旱丘陵区土壤有机质含量的影响

Effects of Irrigation and Fertilization Management on Soil Organic Matter Contents in Semi-Arid Hilly Area

采用二次通用旋转组合设计,在辽西低山丘陵半干旱褐土区进行了8年的田间试验,研究了灌水、施用氮肥、磷肥和秸秆对土壤耕层有机质含量的影响。结果表明:灌水和施用磷肥促进了土壤中的有机质转化和作物吸收,使得土壤有机质含量降低;施用氮肥能够提高土壤中的有机质含量,但是过量施用氮肥则会使土壤中的有机质含量降低;秸秆还田能够显著提高土壤有机质含量。另外,灌水和施肥诸因素对于土壤有机质含量的影响不是孤立的,而是存在着复杂的交互作用,为了提高作物产量和保持土壤肥力,各种因素的合理配合是非常重要的。

Using quadratic general rotation design, a field trial was carried out in hilly semiarid area of western Liaoning, to study the effects of longterm irrigation and fertilization measurement on soil organic matter contents. The results showthat irrigation and P fertilizer can reduce the contents of soil organic matter by promoting its decomposition and its utilization by crops; N fertilizer can increase soil organic matter, but excessive N can reduce it; mulching corn straws could increase soil organic matter apparently. None of factors can effects soil organic matter solely, there are complex interactions among them, reasonable coordinating of the factors is of important for increase production and keep soil fertility.