岩质边坡植被混凝土肥力时间变异性研究

Time Variability of Vegetation Concrete Fertility of on Rocky Slopes

以水布垭生态恢复工程为对象,研究了植被混凝土肥力的时间变化特性。结果显示:2002—2005年间由于坡面植被大量生长及坡面被冲刷的缘故,基材有机质、速效钾含量在此期间呈差异显著(p<0.05)的下降,碱解氮、速效磷含量下降且在前3年差异显著;2005—2007年间由于坡面植被完全生长形成良好群落,土壤库中养分的释放已能满足根的吸收,各营养元素值略呈上升趋势,但仅与2002、2003年相应值差异显著。整个研究期间基材容重呈现先下降后略上升的曲线,pH值均在8.0以上,变化不明显。研究成果为植被混凝土生态防护基材的改良提供了理论根据。

The paper studies the characteristic of time variation of vegetation concrete fertility through field sampling and office processing,measuring and analyzing by taking Shuibuya ecological rehabilitation project as a research object.The outcomes show that due to the growing of slope vegetation and the slope scouring from 2002 to 2005,the organic matter of basic material and the available potassium content are remarkably decreases(p<0.05) in the period;the content value of available nitrogen and available phosphorus are decreases and the difference in the first three years is obvious and;each value of nutrition elements has the tendency of increase but it has remarkable difference with the relevant value of 2002 and 2003,owing to grow well and form a community of slope vegetation and the release of nutriment from soil can meet the assimilation of roots during 2005 to 2007.In the whole study period,the unit weight of basic material in physical indexes decreases and then increase,and pH value is all above 8.0.The outcomes have provided theoretical basis for the improvement of basic material of ecological protection of vegetation concrete.