【摘要】 杉木连栽常导致地力退化,但连栽是否影响丛枝菌根真菌的侵染率并不清楚。以福建三明粉砂岩发育红壤上的连栽杉木为对象,研究了杉木细根丛枝菌根真菌侵染率与土壤性质的关系,分析了杉木连栽影响杉木根系菌根侵染率的主导因素。结果表明,杉木连栽没有显著导致土壤退化现象,二代林杉木细根丛枝菌根真菌侵染率显著高于一代和三代林,一代和三代林之间没有明显差异。通过主成分分析发现,在杉木连栽时,影响杉木丛枝菌根真菌侵染率的主导土壤因子是全氮、容重、SOC和速效磷含量。因此,通过改善土壤结构、提高土壤有机质含量和土壤速效磷含量,在一定程度上可能增加杉木菌根真菌的侵染率,从而有利于提升杉木人工林的生产力。更多还原

【Abstract】 Soil degradation has been widely reported in the successive rotations of Chinese fir plantation, but the effects on the infection rate of the arbuscular mycorrhizal fungi in that plantation is still unclear. In this study, we selected the successive rotations of Chinese fir on the red soil developed from the siltstone in Fujian Sanming. To determine the dominate factors affecting the infection rate of the fungi in these Chinese fir plantation, the relationship between the infection rate of arbuscular mycorrhiza and soil properties were studied. The results showed that continuous planting of Chinese fir did not lead to soil degradation. The infection rate of the fungi associated with fine root of Chinese fir in the second generation forest was significantly higher than that in the first generation and the third generation forest, and there was no significant difference between the first generation and the third generation forest. The principal component analysis showed that the contents of total nitrogen, bulk density, SOC and available phosphorus were the dominant soil factors that impacted the infection rate of the fungi of Chinese fir. Therefore, by improving soil structure, increasing soil organic matter content and soil available phosphorus content may increase the infection rate of Chinese fir mycorrhizal fungi, which is beneficial to improve the productivity of Chinese fir plantation.更多还原