【摘要】 以山地杨树人工林为对象,研究了不同覆盖量和覆盖材料对杨树根际土壤磷动态的影响。结果表明:覆盖后杨树根际全磷含量随着覆盖量的增加而增加,2.5、5.0、7.5 kg/m2覆盖处理的杨树根际土壤全磷量分别比CK高10.77%、13.85%和52.31%;4种覆盖材料间差异不大,但均大于对照。覆盖能有效提高杨树根际土壤有效磷含量,覆盖量越大,效果越明显;不同覆盖材料对根际土壤有效磷的影响有较明显的差异,对杨树根际土壤磷动态变化的影响与不同覆盖厚度处理结果相似,覆盖以后杨树根际土壤全磷含量及有效磷含量有先下降后上升的趋势。更多还原

【Abstract】 Effects of mulching weights and materials on dynamic of phosphorus contents in rhizospheric soil of poplar plantation were investigated in this paper.The results showed that the contents of total P increased with the increasing of mulching materials.The contents of total P after the treatment with 2.5,5.0,7.5 kg/m2 were 10.77%,13.85% and 52.31% higher than that in control respectively.There were little differences among different mulching materials,but the contents of total P mulching with them were higher than that of the control.The contents of available P in rhizospheric soil obviously increased after mulching. The contents of available P rised as mulching weights increased.Mulching materials had remarkable effects on the contents of available P.C.nepalensis and I.cylindrical var.major were superior to Q.fabric and P.aquilinum var.latiuscukum.The effects of mulching materials on dynamic of phosphorus contents in rhizospheric soil were similar to mulching weights.It was found that the contents of total P and available P decreased from April to July,then increased from July to December after biological mulching.更多还原