毛竹成竹期根际土壤微量元素变化规律

A Dynamic Study on Trace Element of Rhizosphere Soil during Bamboo Forming Stage of Phyllostachys edulis

对黄山公益林场毛竹成竹期幼竹生长的根际土壤微量元素、pH值和有机质含量动态进行了测定,结果表明,幼竹根际土壤pH值介于4.86和6.04之间,属于适合幼竹生长的pH值范围。随幼竹生长,pH值呈开口向下的抛物线形状,8月中旬达到最高值,为6.03;有机质含量和Cu含量分别在7月初和6月中旬达到高峰,分别为38.77和0.63,有机质含量在7月底达到最低点,而后慢慢升高,Cu含量则呈开口向下的W形状;Zn、Fe、Mn含量均在6月上旬达到高峰,而后均呈下降趋势。方差分析表明,10月幼竹根际土壤与非根际土壤Cu、Zn、Fe、Mn含量均存在显著差异,说明根际土壤对微量元素的溶解吸收相比非根际土壤来说,受根际小环境影响更显著。

The concentration dynamics of trace element,pH,and soil organic matter in rhizosphere soil of young Phyllostachys edulis during bamboo forming stage were analyzed in Huangshan Public Forestry Farm.The result indicated that the pH value of the rhizosphere soil of one-year-old Ph.edulis was between 4.86 and 6.04,relatively suitable for bamboo＇s growth.With the growth of young bamboo,the pH value took the form of parabola wholly,and reached the maximum in August,6.03;the contents of Cu and organic matters reached the peak in June and July respectively,which were 38.77,and 0.67,the content of organic matters reached the minimum at the end of July,then increased slowly;and the contents of Zn,Fe,and Mn reached the peak in June,then presented a downward trend.Variance analysis showed that there were significant differences in the contents of Cu,Zn,Fe,and Mn between rhizosphere soil and non-rhizosphere soil of the one-year-old Phyllostachys edulis in October,which showed that the effects of micro-environment of rhizosphere on dissolution and absorption of trace elements was greater for rhizosphere soil than for non-rhizosphere soil.