典型黑土区不同水土保持林表层土壤磷素形态及有效性  

Topsoil phosphorus forms and availability of different soil and water conservation plantations in typical black soil region,Northeast China

作　　者：杨小燕[1] 范瑞英[1] 王恩姮[1] 夏祥友[1] 陈祥伟[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《应用生态学报》2014年第6期1555-1560,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41271293);中央高校基本科研业务费专项(2572014AA38)资助

摘　　要：以典型黑土区人工营造的落叶松林、水曲柳林、樟子松林和美青杨林表层土壤（0-10cm）为对象，研究不同类型水土保持林土壤磷素的形态和有效性．结果表明：水曲柳林和美青杨林土壤全磷、速效磷和磷各组分含量均显著高于落叶松林和樟子松林；4种林地土壤磷主要以有机磷形式存在，并且中活性有机磷NaOH—P。含量最高，占土壤磷素总量的58．9％；对植物有效性相对较高的H2O-Pi和NaHCO3-P含量较低，分别占土壤磷素总量的1．2％和6．6％；除NaHCO3-P。外，土壤中不同磷素形态之间以及磷各组分与土壤有机质、全磷和有效磷之间具有显著相关关系．表明研究区内阔叶林比针叶林能够显著地提高土壤磷的有效性．Aiming to understand soil phosphorus status of plantations in typical black soil region of Northeast China, the topsoil （0-10 cm） phosphorus fractionations and its availability were exa- mined in four soil and water conservation plantations dominantly composed of Larix gmelini, Fraxi- nus mandshurica, Pinus sylvestris var. raongolica and Populus nigra vat. italica × P. cathayan, re- spectively. The results showed that total P, Olsen-P and the concentration of different P fraetiona- tions in F. mandshurica and P. nigra var. italica × P. cathayan plantations were significantly higher than that of the other two coniferous plantations. Organic P was the major fractionation in the four plantations＇ topsoil, and sodium hydroxide extractable organic P （NaOH-Po） representing moderately labile organic phosphorus was predominant, which accounted for 58.9% of total P. The contents of H2O-Pi and NaHCO3-P which were more labile to plant were lower, only accounting for 1.2% and 6.6% of total P, respectively. Except for NaHCO3-Po, all the other P fractions of four plantations correlated with each other, and they also had significant correlations with soil organic matter, total P, Olsen-P. Compared with the coniferous plantations, the broadleaf plantations pres- ented higher availability of phosphorus.

关 键 词：黑土 水土保持林 磷组分 磷有效性 

分 类 号：S714[农业科学—林学]