农田土壤磷酸酶活性与土壤N_2O排放通量的相关性

Relationship of field soil phosphatase activity and soil N_2O emission flux

以黄土高原南部旱地小麦田和空闲地为研究对象,设置6种处理,研究了耕作措施、肥料条件变化对小麦不同生育期土壤磷酸酶活性和土壤N2O排放通量的影响.结果表明,耕层土壤磷酸酶活性与土壤N2O排放通量呈显著负相关,相关系数为0.4660.在小麦生育期内,N2O排放通量在拔节期最高,苗期和成熟期最低;磷酸酶活性变化与之相反.农田种植小麦和覆膜均增加了土壤磷酸酶活性和N2O的排放.施肥可以提高磷酸酶活性,单施磷肥比同时施用氮、磷肥时N2O的排放量高.

Using wheat and fallow fields in the dry land in south part of Loess Plateau, as study object with establishing 6 kinds of treatments, the influence of cultivation measure and fertilizer condition change on different growth period on soil phosphatase activity and soil nitrous oxide （N2O） emission flux were studied. The cultivation layer soil phosphatase activity and N2O emission flux appeared negative relation markedly, with correlation coefficient of 0.4660. In the wheat growing stage, the soil N2O emission flux was highest at the jointing stage, and lowest at the seedling and maturity stages. While the phosphatase activity changed into the opposite. The cultivation measure and fertilizer condition changes influenced also the change of phosphatase activity and N2O emission. The wheat planting and film mulching all increased the soil phosphatase activity and N2O emission flux, applying fertilizer could enhance the phosphatase activity. The N2O emission amount of applying the P fertilizer singly was higher than the amount of applying the P and N fertilizers at one time.