禾草种植对荒沟客土理化性质的影响

试验选择客土回填后的山地荒沟,在已建植的雀麦属禾草草地设置试验区,连续2年研究禾草种植对客土理化性质的影响,结果得出：自然条件下,春季播种雀麦属禾草,可以加速山区荒沟植被恢复,改善客土理化性质,播种后2年,地上生物量可达3018.0kg/hm^2,0～10cm土层中pH值明显降低,全氮、碱解氮含量显著提高,达0.562g/kg和30.89mg/kg;播种后3年,植株密度与草地覆盖度达到最大,0～10cm土层土壤容重显著减小,达1.282g/cm^3,总孔隙度显著增加,0～25cm土层土壤紧实度明显降低,同时,0～10cm土层速效磷含量下降速度相对减缓,土壤有机质、速效钾含量显著提高,达到9.603g/kg和189.20mg/kg。

Effect of Planting Grasses on Foreign-Soil Physical and Chemical Characters in the Barren Ravine

Studies on Bromus inermis and Bromus riparius in the barren ravine were conducted with the foreign-soil physical and chemical characters in 2004 and 2005. There were good changes on the foreign- soil physical and chemical characters and the vegetation in three years after planting grasses naturally in the spring. Grass biomass reached 3018.0kg/hm^2 , pH descended significantly, and total and available nitrogen in the 0-10cm were 0. 562g/kg and 30.89mg/kg respectively in two years. In three years after planting grasses, grass density and coverage were the most, soil bulk density was the least 1. 282g/cm^3 in the 0 -10cm, soil porosity increased in the 0-10cm and soil compactiveness descended significantly in the 0- 25cm. Soil organic matter and available potassium improved obviously, 9. 603g/kg and 189.20mg/kg respectively, and available phosphorous descended more slowly in the 0-10cm in the third planting year.