不同年限日光温室土壤盐分及养分变化研究

Study on dynamics of soil salinity and nutriation of greenhouses in different years

以青海省乐都县碾伯镇日光温室土壤为研究对象,分析了种植年限分别为1、2、5、8、10、15、22、25~27年日光温室土壤的盐分和养分含量情况。结果表明:随着日光温室种植年限的增加盐分含量较对照增加的百分数在62.26%~404.72%之间,pH较对照下降的百分数在-6.70%^-2.15%之间,两者呈相反趋势。随着日光温室种植年限的增加,土壤中有机质、全氮、全磷含量明显高于对照,较对照增加的百分数范围分别是83.84%~213.13%、58.45%~164.86%、77.99~243.40%;速效氮含量较对照增加的百分数在39.70%~139.38%之间;温室土壤中有效磷含量波动变化,波动范围-65.81%~47.44%。

The soils of greenhouses in Nianbo Town of Ledu County in Qinghai Province were used as samples,and analyis was made of the content of salt and nutrients in soils with different planting years of 1,2,5,8,10,15,22 and 25～27.The results showed that the the salt content increased with the increase of cultivation years,and the increasing rate ranged from 62.26%～404.72% in contrast with the control;while with the increase of cultivation years,pH decreasing rate ranged from-6.70%～-2.15%;and they had opposite trends;The contents of organic matter,total nitrogen and total phosphorus were significantly higher than the control,and the increasing rate ranged from 83.84%～213.13%,58.45%～164.86% and 77.99%～243.40% respectively compared with the control;The content of available nitrogen also increased,and the increasing rate was from 39.70%～139.38% compared with the control;The available phosphorus changed fluctuately,and the changing rate was between-65.81%～47.44% compared with control.