冀西北栗钙土有机质分解及土壤速效养分变化的研究

The decomposition of organic matter and the change of available nutrient in chestnut soil of Hebei Province.

采用尼龙网袋法研究栗钙土有机质分解及土壤速效养分的变化结果表明,不同有机物(肥)料在前3个月分解较快,最初30d坡梁栗钙土和旱滩草甸栗钙土分解率分别为32.68％和30.32％。新施入有机物(肥)料可明显提高土壤有机质活性系数,平均提高16％左右,腐殖质活性顺序依次为牛粪>莜麦秸>豌豆秸。有机物(肥)料腐解周年后土壤有机碳及速效氮、速效磷、速效钾明显增加。2类土壤有机碳分别为106.67％～135.00％和53.33％～58.18％,速效氮、速效磷、速效钾分别提高34.62％～52.31％和21.10％～50.37％、18.20％～207.60％和34.20％～210.05％、64.92％～143.12％和28.75％～102.49％。

The decomposition of organic matter and the change of available nutrient in chestnut soil are studied through the experiment with nylon bags.The results show That during the first thirty days,the rates of organic fertilizer decomposition are 32.68% and 30.32% in upland chestnut soil and dry meadow chestnut soil respectively;fertilizing new organic matter can increase the active coefficient of organic matter in the soil,the average is about 16%,the order of the active coefficient is cow manure>naked oak stalk>pea stalk;after the organic manure is decomposed for one year,the organic carbon of soil and available N,P,and K increase significantly,the values of organic C are 106.67% ~ 135.00% and 53.33% ~58.18% in two kinds of soils,available nutrient N,P,and K are 34.62% ~ 52.31% and 21.10% ~ 50.37%,18.20%-207.60% and 34.20%-210.05%,64.92%-143.12% and 28.75% ~ 102.49%