增温和施肥对土壤有机质的影响——以内蒙古农牧业科学院四子王旗基地为例

Effect of Warming and Fertilization on Soil Organic Matter——With Research Base of Inner Mongolia Academy of Agriculture and Animal Husbandry Located in Siziwangqi as Example

以内蒙古高原短花针茅(Stipa breviflora Griseb.)+冷蒿(Artemisia frigida Willd.)+无芒隐子草(Cleistogenes mutica Keng)的荒漠草原为研究对象,野外自然条件下进行增温设施和施氮肥试验,研究了施肥增温、施肥不增温、不施肥增温、不施肥不增温条件下各土层、各种处理土壤有机质的变化规律。结果表明,在增温、施氮条件下有机质含量均增加,在4种处理条件下土壤有机质含量都随着土层的加深而逐渐降低;增温施氮作用下2008年的有机质含量明显低于2007年。这与当年的雨水有很大关系,对照区不同深度土壤的有机质含量变化规律是一致的,都随着年份的增加而逐渐减少。

With the desert steppe of Inner Mongolia Plateau as research object, in which the Stipa breviflora Griseb., A rtemisiafrigida Willd. and Cleistogenes mutica Keng were major plants, the tests of warming facilities and nitrogen application were conducted under natural field conditions to study the change laws of soil organic matter in each soil layer and with different treatments under the conditions of fertilization and warming, fertilization without warming, warming without fertilization and neither fertilization and warming. The results showed that the organic matter contents in soil were all increased under the warming and nitrogen application conditions and that were all reduced gradually with deepening of the soil under 4 treatment conditions. Under the action of warming and nitrogen application, the organic matter content in soil in 2008 was evidently lower than that in 2007, which had great relation to rainwater in those years. The change taws for the organic matter contents in different depth of soil in control area were consistent, which all diminished gradually with year increasing.