栽培模式对水稻土脲酶活性及土壤碱解氮含量的影响

摘要

为研究水稻栽培模式对土壤性质的影响,以南方典型双季稻田为研究对象,于湖南浏阳试验田采取土样,测定不同水稻栽培模式下土壤脲酶活性及碱解氮含量,结果表明:1)高氮水平处理的脲酶活性最高,氮空白对照的脲酶活性最低,处理间土壤脲酶活性高低为:超高产栽培＞高产高效栽培＞高效超高产栽培＞常规栽培＞氮空白；2)随着土层深度的增加碱解氮含量逐渐减少,脲酶活性在一定土层深度范围内随深度增加而降低；3)超高产栽培模式可提高耕作层下层土壤碱解氮含量及脲酶活性,说明超高产栽培能改变深层土壤性质.%Soil urease is sensitive to the changes of the soil ecosystem and has an important impact on soil nitrogen metabolism.In order to study the influence of different rice cultivation patterns on soil urease activity,we measured soil urease activity and alkali-hydro nitrogen from double-crop rice fields with different cultivation modes in Liuyang county,Hunan Province.The typical double-crop rice fields were used as research objects and field plot experiment method was adopted.The results showed that:a) soil urease activity increased with the increasing of nitrogen fertilizer,the highest nitrogen treatment had the highest activity of soil urease,and the blank control was the lowest,and the trend of soil urease activity in different cultivation as follows:Super-yield cultivation ＞ high-yield-and-efficiency cultivation ＞ high-efficiency-and-super-yield cultivation ＞ local traditional cultivation ＞ blank control.b) The Alkali-hydro nitrogen in soil decreased with the depth increased,and the soil urease activity decreased with the depth increased in certain soil depth.c) In the 15-25cm layer of soil,super-yield cultivation could raise the content of alkali-hydro nitrogen and the activity of soil urease,which indicated that the super-yield cultivation could change the soil properties in deep layer.