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菌根真菌在干旱半干旱地区退化生态系统植被恢复与重建中具有重要作用。以科尔沁沙地乡土树种五角枫(Acer mono)和榆树(Ulmus pumila)及主要造林树种白蜡(Fraxinus chinensis)和樟子松(Pinus sylvestris var.mongolica)为供试植物,通过科尔沁沙地菌根化造林试验,分析4种造林幼苗接种菌根菌剂后幼苗的菌根侵染率、形态学指标、生物量积累和分配以及根际土壤养分在一个生长季内的变化。结果表明:两种菌根菌剂能较好地侵染幼苗,接种菌根菌剂显著提高了4种幼苗的株高、基径、顶枝长和生物量;显著影响幼苗的生物量分配,接种内生菌剂的白蜡根冠比显著减小,接种外生菌剂的樟子松根冠比显著增加;相关分析表明,菌根侵染率与白蜡幼苗株高和顶枝长呈显著正相关,与樟子松幼苗输导根质量、地上生物量和总生物量呈显著正相关;接种菌根菌剂还能提高根际土壤有机质和全氮含量,改良幼苗生长基质,但差异不显著。4种造林幼苗均表现出了显著的菌根效应,提示菌根菌剂在干旱贫瘠地区造林中具有很强的应用价值。
Mycorrhizal fungi plays an important role in the restoration and reconstruction of degraded ecosystems in arid and semi-arid areas. Acer mono, Ulmus pumila and Fraxinus chinensis and Pinus sylvestris var. Mongolica were used as test plants in the Horqin sandy land, Afforestation experiments were conducted to analyze the changes of mycorrhizal infection, morphological characteristics, biomass accumulation and distribution, and rhizosphere soil nutrient in one growing season after inoculation of 4 kinds of afforestation seedlings. The results showed that two kinds of mycorrhizal fungi could infect the seedlings well, and the inoculation of mycorrhizal fungi significantly increased the plant height, the base diameter, the top branch length and the biomass of four seedlings, significantly affected the seedling biomass allocation, The root / shoot ratio of white wax inoculated with endophytic fungi was significantly decreased, and the root / shoot ratio of Pinus sylvestris var. Mongolica inoculated with exogenous fungi was significantly increased. Correlation analysis showed that the mycorrhizal infection rate was significantly and positively correlated with the plant height and top branch length , And root mass, shoot biomass and total biomass of seedlings of Pinus sylvestris var. Mongolica were significantly and positively correlated. Inoculation of mycorrhizal fungi could increase the content of organic matter and total nitrogen in rhizosphere soils and improve seedling growth matrix, but the difference was not significant. The four kinds of afforestation seedlings showed significant mycorrhizal effect, suggesting that mycorrhizal fungi agents in the arid and barren areas of afforestation has a strong application value.