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在过去的十五年中松树造林在热带各地发展得很快。这些地方一般是在一个高雨量的雨季之后跟着是一个旱季。用聚乙稀简(两头开口)或罐(一头闭口)育苗,在栽植的第一年比一般苗床育苗成活率高,因为在苗根周围的土壤是保留着的。然而,现在已经明显地表明在聚乙烯容器中的卷根引起绞茎,并在栽植几年后地面根际折断。在苗圃中,这些卷根通常在土壤之外,经常靠近筒容器的底,显而易见,在罐中卷根甚至继续再朝上生长。栽植之后,
Pine afforestation has developed rapidly throughout the tropics in the past fifteen years. These places are generally followed by a dry season after a high rainfall season. Breeding with polythene (open ends) or cans (one closed) results in a higher survival rate in the first year of planting than in the general seedling because the soil around the seedling is retained. However, it has now become clear that rooting in a polyethylene container causes a twist of the stalk and fractures the ground rhizosphere several years after planting. In the nursery, these roots are often outside the soil, often close to the bottom of the canister, and it is evident that the rooting in the jar even continues to grow upward. After planting,