不同蓼草根际土壤酸性磷酸酶活性及其影响因素

Acid Phosphatase Activity and Its Influencing Factors in Rhizosphere Soils of Different Polygonum Plants

为研究不同蓼草对磷的吸收能力,探讨土壤环境因子对蓼草根际土壤酸性磷酸酶(ACP)的影响,将通过抖动法采集的3种蓼草根际和非根际土壤进行理化性质和ACP测定分析。结果表明:3种蓼草非根际土壤ACP活性在0.32~1.65 mg·g^(-1)·h^(-1),而根际土ACP活性为1.37~1.92 mg·g^(-1)·h^(-1),其中粘蓼根际土壤ACP活性最高,其次是丁香蓼和红蓼。粘蓼植株全磷含量最高,根系中全磷含量为0.596 mg·g^(-1),地上部全磷含量为0.490 mg·g^(-1)。丁香蓼吸收、蓄积磷的能力最强,平均每株固磷9.58 g,是一种理想的土壤磷污染修复植株。土壤全氮、全磷和速效磷含量与ACP活性均呈显著正相关关系,土壤水分、pH值、有机质、碱解氮、CEC和黏粒含量与蓼草根系ACP活性的相关性均未达到显著水平。土壤全磷含量是影响这3种蓼草根际土壤ACP活性的最主要因素。

In order to explore the phosphorus uptake capacity of different Polygonum species and the effect of soil environmental factors on soil acid phosphatase(ACP)in the rhizospheric soils of Polygonum plants,soil physicochemical properties and soil ACP were determined and analyzed in three types of rhizospheric and non-rhizospheric soils of Polygonum species collected by a shaking method.Results showed that the ACP activities of non-rhizosphere soils of the three Polygonum species ranged from 0.32 to 1.65 mg phenol·g^(-1) soil·h^(-1),while those of rhizosphere soils ranged from 1.37 to 1.92 mg phenol·g^(-1) soil·h^(-1),with the highest ACP activity in the rhizosphere soil of Polygonum viscoferum Mak,followed by Ludwigia prostrata Roxb and Polygonum orientale Linn.The highest total phosphorus concentration was found in Polygonum viscoferum Mak,with 0.596 mg·g^(-1) in the root system and 0.490 mg·g^(-1) above ground.Ludwigia prostrata Roxb had the greatest ability to absorb and accumulate phosphorus,with an average phosphorus fixation of 9.58 g per plant,making it an excellent plant for soil phosphorus pollution remediation.Soil total nitrogen,total phosphorus and available phosphorus contents were significantly and positively correlated with the ACP activity,while soil moisture,pH,organic matter,alkaline nitrogen,CEC and clay grain contents did not correlate with ACP activity of Polygonum roots at significant levels.The soil total phosphorus content was the primary factor influencing the rhizospheric soil ACP activity of these three Polygonum species.