Influence of initial age and size on the field performance of <Emphasis Type="Italic">Larix olgensis</Emphasis> seedlings |
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Authors: | G L Li Y Liu Y Zhu J Yang H Y Sun Z K Jia L Y Ma |
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Institution: | (1) College of Forestry, Beijing Forestry University, 100083 Beijing, China;(2) Key Laboratory for Silviculture and Conservation, Ministry of Education, Beijing Forestry University, 100083 Beijing, China; |
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Abstract: | Quality of seedlings is important for the success of plantations. The field performance of five stock types of Olga Bay larch
(Larix olgensis Henry) seedlings three seasons after planting was evaluated. High survival rates were achieved for all five types of planting
stock in the first-year growing season when weeds were controlled. In the second and third-year growing seasons, significant
differences were observed in survival rates among different stocktypes. The 1 + 1 type of Olga Bay larch seedling demonstrated
better survival than 1 + 0 type of seedlings. 1 + 1 seedlings with diameter larger than 5.0 mm as well as 1 + 0 seedlings
with diameter larger than 4.5 mm were suitable for reforestation. The 1 + 1 stocktype with a root collar diameter between
6.0 and 7.5 mm was considered optimal for the establishment of fast-growing and high-yield plantations. The number of lateral
roots > 1 cm in length was the best predictor of field performance, however, the number of first order lateral roots with
diameter > 1 mm at the tap root junction (FOLR (D > 1 mm)) was more feasible and sufficiently reliable to predict the field
performance of the deciduous conifers. The initial height and root collar diameter of seedlings showed a significant correlation
with the field performance for both 1 + 1 and 1 + 0 seedlings in the first and second-year growing seasons and thus can be
adopted as an indicator for predicting potential field performance of seedlings. |
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