不同海拔毛竹土壤酶活性与土壤理化性质关系的研究

以江西省大岗山地区的毛竹林为研究对象,利用相关分析和主成分分析对不同海拔(300、400、500、600、700m)土壤纤维素酶、蔗糖酶、淀粉酶、β-葡糖苷酶和多酚氧化酶活性的变化特征进行了分析,探讨了其与土壤理化性质的关系。结果表明:土壤化学指标表现出随海拔的升高而增加的变化特征,除碱解氮外,其他各指标均处于较低水平,但物理指标的变化各不相同;随海拔升高,β-葡糖苷酶与多酚氧化酶活性呈现出增加的趋势,而纤维素酶、蔗糖酶和淀粉酶活性无明显变化规律;几种土壤酶对土壤肥力的指示效果不同,β-葡糖苷酶在评价毛竹林土壤肥力上具有重要指示效果,其后依次为蔗糖酶和多酚氧化酶、纤维素酶,但淀粉酶不适宜用来评价土壤肥力状况;通过主成分分析计算综合得分,不同海拔毛竹土壤肥力随海拔的升高而增加。

The relationship between soil enzyme activities and soil Physicochemical properties in Moso bamboo forest soil at different altitudes

The activities and the characteristics of soil cellulase, invertase, amylase, β- glucosidase, and polyphenol oxidase were studied in Moso bamboo forest stands at different altitudes （300,400,500,600 and 700 m a. s. l. ） in Dagang Mountain of Jiangxi Province. Correlation analysis and principal component analysis were used to reveal the relationship between soil enzyme activities and soil physicochemical properties. The results were showed as the followings： 1 ） With increasing alti- tude, the soil chemical properties increased, apart from alkali hydrolysable N, other parameters were at low levels with var- ied soil physical properties. 2） With increasing altitude, the activity of β- glucosidase and polyphenol oxidase increased, but that of cellulase, invertase and amylase had no regular changes. 3） Soil enzymes had different indicative effects on soil fertility in the order of β- glucosidase 〉 invertase and polyphenol oxidase 〉 eellulase, and amylase was not suitable for eval- uating soil fertility. 4） The integrated scores from principal component analysis suggested that the soil fertility levels of Meso bamboo forest stands increased with altitude.