生态环境学报2016，Vol.25Issue(12)：1929-1936,8.DOI:10.16258/j.cnki.1674-5906.2016.12.006
南亚热带森林优势树种氮、磷可利用性与菌根侵染率的关系
Relationship between Nitrogen and Phosphorus Availability and Mycorrhizal Infection Rates of Dominate Tree Species in Southern Subtropical Forests
摘要
Abstract
Sufficient nitrogen (N) and phosphorus (P) supply is important for plant growth because they are the essential macronutrients. Mycorrhizal fungi are one of the essential way for plant to absorb nutrients, such as N and P etc., but most previous studies were carried out in the grasslands, farmlands, and most of them were simulated experiments or potted experiments. The aims of this study were to research the relationship between mycorrhizal infection rates and nitrogen, phosphorus availability in common dominate tree species at different succession stages,including a primary stage (Pine forest, PF), middle stage (Mixed pine and monsoon evergreen broadleaved forest, MF), and climax stage (Monsoon evergreen broadleaved forest, BF) in southern subtropical forests. Three common dominate tree species including Pinus massoniana (PF and MF), Schima superba (MF and BF) and Castanopsis chinensis (MF and BF) were selected .We detected mycorrhizal infection rates, soil acid phosphatase activity (APA) of rhizosphere soil, and the chemical-physical properties of rhizosphere soil and leaves. The results showed that: (1) Mycorrhizal infection rates of Pinus massoniana significant increased from 48.18% (PF) to 65.7% (MF), similarly, the mycorrhizal infection rates of Schima superba and Castanopsis chinensis also increased from 57.7% and 50.79% (MF) to 64.03% and 53.18% (BF), respectively. (2) Correlation analysis presented that mycorrhizal infection rate of these three common dominate tree species had a significant negative correlation with the concentration of foliar phosphorus, and mycorrhizal infection rate of Pinus massoniana also had a significant positive correlation with the concentration of ammonium nitrogen in rhizosphere soil. (3) APA and foliar N:P of these three common dominate tree species increased with the forest succession, the APA of Schima superba and Castanopsis chinensis increased significantly from 8.8 μmol·g-1·h-1 and 9.38 μmol·g-1·h-1 (MF) to 16.96 μmol·g-1·h-1 and 15.55 μmol·g-1·h-1 (BF), respectively. Correlation analysis indicated that APA had a significant negative correlation with the concentration of soil available phosphorus, while APA had a significant positive correlation with the C:P, N:P in rhizosphere soil and N:P of the foliar. Our research indicated that increasing phosphorus limitation increased the mycorrhizal infection rate with forest succession, and mycorrhizal fungi could relieve the phosphorus limitation in common dominate tree species at different succession stages in southern subtropical forest.关键词
氮、磷可利用性/菌根侵染/优势树种/酸性磷酸酶活性/南亚热带森林Key words
nitrogen and phosphorus availability/mycorrhizal infection/dominate tree species/acid phosphatase activity (APA)/southern subtropical forest分类
农业科技引用本文复制引用
钟思远,张静,童琳,高一飞,夏艳菊,唐旭利..南亚热带森林优势树种氮、磷可利用性与菌根侵染率的关系[J].生态环境学报,2016,25(12):1929-1936,8.基金项目
国家自然科学基金项目(31270499) （31270499）
