ABSTRACT

Forest regeneration by tree planting on harvested sites in the boreal forests of northern Europe is frequently preceded by site preparation to increase survival and growth of the seedlings. We studied whether a small addition of arginine phosphate (AP treatment) at the time of planting would further enhance the seedlings’ early performance. Following two growth seasons, we investigated survival and growth of Scots pine (Pinus sylvestris) seedlings on 11 locations between latitudes 61.1°N and 67.1°N in the boreal forest of northern Sweden. The planting positions of seedlings were on capped mounds and bare mineral soil following mechanical site preparation, and in non-prepared soil. We found that seedling survival following site preparation increased with AP treatment. On capped mounds, seedling survival was more variable and appeared more dependent on precipitation during the first month after planting than seedlings positioned in the mineral soil. The positive effect of AP treatment on seedling growth differed between sites and was more pronounced on sites with longer growing seasons. AP treatment had no significant effect on survival of seedlings planted in non-prepared soil, while the positive effect on growth was more pronounced at sites with higher fertility using this planting position.

摘要

通过在北欧北方森林的采伐地点植树进行森林再生，通常先进行整地，以增加幼苗的存活和生长。我们研究了在种植时少量添加精氨酸磷酸盐（AP 处理）是否会进一步提高幼苗的早期性能。在两个生长季节之后，我们调查了苏格兰松（Pinus sylvestris）的存活和生长在瑞典北部北方森林中纬度 61.1°N 和 67.1°N 之间的 11 个地点种植幼苗。幼苗的种植位置在机械整地后的盖土丘和裸露的矿质土壤上，以及在未整地的土壤中。我们发现整地后的幼苗存活率随着 AP 处理而增加。在加盖的土丘上，与放置在矿质土壤中的幼苗相比，在种植后的第一个月内，幼苗的存活率变化更大，似乎更依赖于降水。AP处理对幼苗生长的积极影响因地点而异，并且在生长季节较长的地点更为明显。AP处理对种植在非整地土壤中的幼苗成活率无显着影响，