热辐射对保护地土壤钾素的影响

目的]研究热辐射对土壤钾素的影响。方法]选择保护地土壤,采用室内热辐射模拟方法,测定不同程度热辐射后土壤钾素组分的含量。结果]当辐射温度在200℃以内时,土壤速效钾和缓效钾含量变化不大;当辐射温度大于200℃时,土壤中速效钾含量逐渐上升,572℃时速效钾含量达到最高,以后呈下降趋势;当辐射温度在200～300℃时,土壤缓效钾含量呈下降趋势,辐射温度为263℃时缓效钾含量降至最低;当辐射温度大于400℃时,缓效钾含量急剧上升。土壤矿物态钾和全钾含量在低温辐射阶段有轻微波动,在高温辐射阶段无明显变化,但不同辐射温度下矿物态钾和全钾含量间差异不显著。结论]热辐射对土壤不同形态钾有明显的影响。

Effect of Thermal Radiation on Soil Potassium of Protected Field

Objective] The aim was to explore the effect of thermal radiation on soil potassium.Method] Choosing soil of protective farmland,by means of indoor thermal radiation simulation,the content of various components of potassium under different thermal radiation temperature was measured.Result] The content of available K and slowly available K in soil had not obviously changed below 200 ℃ of radiation temperature.The content of available K gradually raised over 200 ℃,and reached the highest point at 572 ℃,thereafter started to decrease.The content of slowly available K had downtrend at 200-300 ℃,then reached the lowest point at 263 ℃ and raised substantially over 400 ℃.The content of mineral K and total K had a little undulation at low radiation temperature,and hadn′t obviously changed at high radiation temperature,but differences of mineral K and total K were not significant by variance analysis under different radiation temperature.Conclusion] Thermal radiation had effect on potassium of different forms in soil.