峨眉冷杉幼苗对P的吸收利用特征及潜在机制

采样盆栽试验的方式，从不同形态磷作用下峨眉冷杉（Abiesfabiri）幼苗生物量的响应，根区土壤速效磷含量变化特征及其与土壤pH和根系分泌有机酸问的关系的角度探讨了峨眉冷杉幼苗对P的吸收利用特征及潜在机制。结果表明，磷的添加促进了蛾眉冷杉幼苗生物量的累积，但累积量随磷形态而不同（F=27．1，P〈0．001）。添加Ca－P时生物量最低，其次是Al—P、Fe—P、Py—P和K—P。磷形态（F=30．5，P〈0．001）对峨眉冷杉幼苗对磷的需求效率具有显著影响。峨眉冷杉幼苗的磷需求效率在K－P处理下最高，在Ca-P和Fe-P处理下最低，磷利用效率则相反。峨眉冷杉幼苗根际土壤速效磷含量高于非根际土...

Full description

Saved in:
Bibliographic Details
Published in西南农业学报 Vol. 29; no. 7; pp. 1682 - 1686
Main Author 邱阳 吴艳宏 孙守琴 商宏莉
Format Journal Article
LanguageChinese
Published 四川师范大学生命科学学院,四川成都,610101%中国科学院水利部成都山地灾害与环境研究所山地表生过程和生态调控重点实验室,四川成都,610041 2016
Subjects
峨眉冷杉
有机酸
根际
磷素
根际
Rhizosphere
磷素
Organic acid
Phosphate
峨眉冷杉
有机酸
Abies fabri
Online AccessGet full text
ISSN1001-4829
DOI10.16213/j.cnki.scjas.2016.07.033

Cover

More Information
Summary:采样盆栽试验的方式，从不同形态磷作用下峨眉冷杉（Abiesfabiri）幼苗生物量的响应，根区土壤速效磷含量变化特征及其与土壤pH和根系分泌有机酸问的关系的角度探讨了峨眉冷杉幼苗对P的吸收利用特征及潜在机制。结果表明，磷的添加促进了蛾眉冷杉幼苗生物量的累积，但累积量随磷形态而不同（F=27．1，P〈0．001）。添加Ca－P时生物量最低，其次是Al—P、Fe—P、Py—P和K—P。磷形态（F=30．5，P〈0．001）对峨眉冷杉幼苗对磷的需求效率具有显著影响。峨眉冷杉幼苗的磷需求效率在K－P处理下最高，在Ca-P和Fe-P处理下最低，磷利用效率则相反。峨眉冷杉幼苗根际土壤速效磷含量高于非根际土壤，且根际－非根际土壤有效磷含量差值随着磷添加浓度的增加而增加。根区－非根区速效磷含量差值与pH具有显著相关关系。说明根区pH下降是导致峨眉冷杉幼苗根区土壤速效磷含量增加的直接原因之一。根区－非根区草酸含量差值与根区－非根区pH差值具有相关关系，说明根系分泌的有机酸尤其是草酸是导致根区pH下降的直接原因，因而是峨眉冷杉幼苗利用土壤难溶性磷的主要机制。
Bibliography:Sampling potted test of way was adopted, under the action of different forms of phosphorus in Abiesfabri responses of seedling bio- mass, root zone soil available phosphorus content change and its soil pH and organic acid in root exudates of Abies fabri in the context of the relationship between seedling characteristics to study p uptake and utilization of potential mechanisms. Results showed that the phosphorus promoted the accumulation of biomass of seedlings of Abies fabri, but the cumulative amount of phosphorus formed in different （ F = 27.1, P 〈 0. 001 ）. Added Ca-P hiomass in the lowest, followed by Al-P, and Fe-P, Py-P and K-P. Phosphorus （ F = 30.5, P 〈 0. 001 ） on seedlings of Abies fabri had a significant impact on phosphorus efficiency of demand. Seedlings of Abiesfabri phosphorus efficiency in K-P treat- ment of the demand the highest in the Ca-P and Fe-P under the lowest phosphorus use efficiency was the opposite. Abies fabri seedlings in rhizosphere soil available phosphorus content was higher
ISSN:1001-4829
DOI:10.16213/j.cnki.scjas.2016.07.033