芦苇根际土壤有机磷组分的季节变化及与磷酸酶活性的关系  

Seasonal Variations of Organic Phosphorus Composition and Their Relationship with Phosphatase Activity in Phragmites communis Rhizosphere Soil

作　　者：朱芸芸[1] 李敏[1] 曲博[1] 赵暾[1] 滕泽栋 ZHU Yunyun LI Min QU Bo ZHAO Tun TENG Zedong(College of Environmental Science and Engineering, Beo＇ing Forestry University, Beijing 100083, China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083

出　　处：《土壤》2016年第6期1108-1113,共6页Soils

基　　金：国家自然科学基金项目(51279004);人事部留学基金委择优资助项目(优秀项目类)资助

摘　　要：通过野鸭湖湿地一年实验研究了芦苇根际土壤中各组分有机磷含量随植物生长的变化规律,分析了不同有机磷组分与磷酸单酯酶、磷酸二酯酶活性间的关系。结果表明:有机磷含量分布为活性有机磷(L-OP)<中活性有机磷(ML-OP)<中稳定性有机磷(MR-OP)<高稳定性有机磷(HR-OP),各组分含量均随芦苇生长先降低后升高。在芦苇对养分需求最大的旺盛生长期,L-OP、ML-OP含量达到最低值,分别为2.46、3.27 mg/kg;在此阶段,MR-OP、HR-OP含量也有所降低。在有机磷矿化过程中,HR-OP一定程度上可转化为ML-OP,ML-OP与MR-OP主要转化为L-OP。磷酸单酯酶与磷酸二酯酶活性均随芦苇生长先降低后升高,在其旺盛生长期达到最低值,分别为Ph OH 0.37 mg/(g·h)和PN 62?g/(g·h)。磷酸酶活性均与L-OP、ML-OP、HR-OP含量呈极显著或显著正相关,活性磷含量的高低对磷酸酶活性有明显的影响作用,两种磷酸酶在一定程度上也可水解转化稳定性高的有机磷组分。衰亡期的芦苇,其衰败的老根及脱落物可间接促进磷酸酶活性。Seasonal variations of different organic phosphorus （OP） composition and their relationship with phosphomonoesterase and phosphodiesterase activities in Phragmites communis rhizosphere soil were studied by one-year experiment of Yeyahu wetland. The results showed that the contents of different OP compositions were ranked in the order of labile OP （L-OP）〈 Moderately labile （ML-OP）〈Moderately resistant （MR-OP）〈Highly resistant （HR-OP）, various contents declined to a nadir and then rose with the plant growth. Due to the demand for nutrients, L-OP and ML-OP contents reached the lowest values of 2.46 and 3.27 mg/kg respectively in vigorous growth period of Phragmites communis. Meanwhile, MR-OP and HR-OP contents also decreased at this stage. In the mineralization process, HR-OP mainly conversed to ML-OP, MR-OP and ML-OP mainly conversed to L-OP. Besides, the activities of phosphomonoesterase and phosphodiesterase also decreased to the lowest values of PhOH 0.37 mg/（g.h） and PN 62 Ixg/（g-h） respectively. There were significant correlations between L-OP, ML-OP, and HR-OP contents with phosphomonoesterase and phosphodiesterase activities respectively, indicating the contents of L-OP and ML-OP will have significant impacts on phosphatase activity, and phosphatases can hydrolyze the stable organic phosphorus component. In the decay period of Phragmites communis, the dead root and shedding contributed to the process of metabolism of microorganisms, and then improved the phosphatase activity in the rhizosphere soil.

关 键 词：有机磷 磷酸单酯酶 磷酸二酯酶 根际土壤 芦苇 

分 类 号：S154.1[农业科学—土壤学]