森林土壤磷酸酶活性变化特征及其影响因素

Variations of Phosphatase Activity in Forest Soil and Its Influencing Factors

以镇江南山森林公园6种林间土壤为研究对象,探讨磷酸酶活性、磷组分的分布特征及环境因子对其的影响。通过室内分析和不同温度梯度下的培育试验,发现6种森林土壤肥力较强,磷酸酶活性高,其值为11 676.10~33 271.29μg/g;磷酸酶活性与有机碳含量呈正相关,与总氮含量呈负相关,与无机磷、有机磷和总磷含量呈显著正相关,相关系数分别为0.94（P〈0.01）、0.94（P〈0.05）和0.95（P〈0.01）;土壤中Zn、Cd含量较低,均与磷酸酶活性呈正相关。低浓度重金属胁迫对磷酸酶活性有一定的刺激作用;温度的升高能够促进土壤中有机磷向有效磷的转化。研究结果表明,南山森林土壤磷循环过程活跃,土壤有机碳、总氮和各形态磷是磷酸酶活性的主要影响因子。

Six types of forest soils in Zhenjiang Nanshan Forest Park were studied. The phosphatase activity was analyzed and the affections of environmental factors on phosphatase activity were discussed. The results showed that Nanshan Forest Park soils were fertility and the phosphatase activity was strong. The phosphatase activity ranged from 11 676.10 μg / g to 33271.29 μg / g. Soil phosphatase activity was positively correlated with organic carbon content and negatively correlated with total nitrogen content. The phosphatase activity was significantly positively correlated with inorganic phosphorus, organic phosphorus and total phosphorus contents. The correlation coefficient was 0.94（P0.01）, 0.94（P0.05） and 0.95（P0.01）, respectively. Phosphatase activity also was positively correlated with soil Zn and Cd contents. Heavy metal with low concentrations could stimulate the phosphatase activity. And increasing temperature could promote the conversion of organic phosphorus to the available phosphorus in soil. The results showed that the phosphorus recycling process in Nanshan forest soil was active. Soil organic carbon, total nitrogen and various forms of phosphorus were the main influencing factors of phosphatase activity.