不同生境和基质对经过牛消化道的新疆野苹果种子萌发和幼苗生长的影响OA北大核心CSTPCD

This study aimed to reveal the effects of different habitats and substrates on seed germination and seed-ling growth of Malus sieversii after passing through digestive tract of cattle.A controlled experiment was set up in field based on the different habitats and substrates in which seeds were deposited after passing through the di-gestive tract of cattle.The three habitats were as follows:forest edges,gaps,and understory.The four treatments were as follows:W(seeds through digestive tract+intact feces),P(seeds through digestive tract+broken feces),T(seeds through digestive tract+soil),and control C(seeds not through digestive tract+soil).The results showed that:The seed germination rates,seedling survival rate,and seedling biomass of M.sieversii were significantly different(P<0.05)in different habitats and treatments.In the forest edge habitat,seeds germinated rate was high-er in soil substrate compared to fecal substrate,while the gaps and understory habitats showed the opposite trend.Seedling survival rate was significantly higher in the forest edge and gaps habitats compared to the understory habitat.Under the same treatment,seedling biomass was higher in the forest edge compared to the gaps,and high-er in the gaps compared to the understory.Within the same habitat,seedling biomass from fecal substrate in forest edge and gap habitats surpassed that of soil substrate.The study revealed that the heterogeneity of habitat and sub-strate is the main reason that affects the seed germination and seedling establishment of M.sieversii after passing through digestive tract of cattle.