坡地不同利用方式对土壤氮、磷、钾的影响研究

 2002~2004年在云南宣威开展“坡地不同利用方式对土壤化学性状的影响”试验,结果表明:自然草地围栏封育改良、坡耕地退耕还草能不同程度地提高土壤氮、磷、钾含量,坡耕地种植玉米土壤氮、磷、钾含量逐年减少。人工草地建植3年后土壤速效氮、速效钾,碱解氮和全氮、磷、钾分别增加14.01%,4.91%,5.85%,5.76%,5.87%,0.92%。退化的自然草地围栏封育3年后土壤速效磷、速效钾,碱解氮和全氮、磷、钾分别增加16.66%,10.17%,7.74%,11.16%,5.39%,1.37%,坡耕地由于水土流失严重,3年后土壤速效磷、速效钾,碱解氮和全氮、磷、钾分别降低了5.85%,1.17%,5.55%,3.36%,2.48%,0.95%。

Effcet of Different Utilization Types on Soil N,P,K Content at Sloping Land

"Effcet of different utilization types on soil chemistry property at sloping land"is conducted in Xuanwei,Yunnan in 2002~2004.The results showed that artificial grassland and natural grassland treatments increased soil N,P,K content at different degree,but cultivating maize on sloping land reduced soil N,P,K content year by year.After 3 years,The soil organic content,soil available N,P,K and total N,P,K of artificial grassland respectively increased by 14.01%,4.91%,5.85%,5.76%,5.87%,0.92%;The soil available N,P,K and total N,P,K respectively increased by 16.66%,10.17%,7.74%,11.16%,5.39%,1.37% in degenerative nature grassland which is rounded the column seal to growth.However,the soil available N,P,K and total N,P,K respectively declined 5.85%,1.17%,5.55%,3.36%,2.48%,0.95% on sloping land by serious soil erosion.