不同耕作方式下黑土团聚体养分变化

为研究不同耕作方式对不同粒级土壤肥力的影响,设置免耕秸秆覆盖、深松秸秆还田、露天免耕、深松秸秆点烧和传统耕作5个处理,测定不同粒级上养分变化。结果表明:保护性耕作在各个粒径上都提高了有机质、全氮、全磷、速效氮、速效磷和速效钾含量。全磷和碱解氮含量在2.00mm团聚体上增加幅度较大,速效钾含量在0.25mm团聚体上增加幅度较大。随土壤团聚体的减小,保护性耕作各粒级团聚体有机质、全氮、全磷、碱解氮和速效磷有增大的趋势,但幅度各不相同。速效钾变化无明显规律。

Nutrient Change of Soil Aggregates Under Different Reclamation

In order to study the effect of different reclamation on soil fertility, five treatments were set up inclu- ding no tillage with straw cover,Fukamatsu straw,open no tillage, straw burning Fukamatsu point and conven- tional tillage. Nutrient change at different particle size was determined. The results showed that conservation tillage in various particle sizes increased organic matter, total nitrogen,total phosphorus,available nitrogen,a- vailable phosphorus and available potassium content. Total phosphorus, available nitrogen in aggregates 2.00 mm increased greatly, available potassium in aggregates~0.25 mm increased greatly. Conservation tillage appeared increasing tendency with the decreasing of soil aggregates, organic matter, total nitrogen, total phos- phorus, available nitrogen, available phosphorus, but the magnitude of each are not identical, available potassium had no obvious change.