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Citation:

Leaf Modular Population Characteristics of Taxus yunnanensis Plantation under Different Branches and Leaves Harvesting Models

  • Received Date: 2014-05-10
  • Three harvesting models (cutting the trunk and harvesting upper branches and leaves, retaining the trunk and harvesting upper branches and leaves, retaining the trunk and harvesting lower branches and leaves) were tested to harvest six-years-old Taxus yunnanensis plantation in Maguan County of Yunnan Province. Each model consisted 3 harvesting intensities. Through one-year's continuous observation, the amount and dynamics of T. yunnanensis plantation leaves were analyzed. The results showed that with the increase of harvesting intensity, the amount of falling leaves increased for all the 3 harvesting models, and at the same time, the defoliation rate of older leaves showed an increasing trend over time. Harvesting can promote the increase in the amount of new leaves, but compared with harvesting the lower branches, harvesting the upper branches was more effective to promote the increase of new leaves. Harvesting would reduce spring leaf density, and improve autumn density. The overall density of new leaves showed no significant difference with different harvesting models. The leaf net amount increased with the recovery strength of 3 harvesting models. In order to harvest more branches and increase the net yield of leaves in the coming year, it is suitable to cut the trunk and harvest upper 3/4 branches and leaves of crown length, retain the trunk and harvesting upper 3/4 branches and leaves of crown length. The net amount of leave increment was 2.96 times and 3.00 time that of the control. Simultaneously, if the trunk is harvested, there would be more sprouts in the rest of crown. To sum up, cutting trunk and harvesting upper 3/4 branches and leaves of crown length would be the best harvesting model.
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Leaf Modular Population Characteristics of Taxus yunnanensis Plantation under Different Branches and Leaves Harvesting Models

  • 1. Research Institute of Resources Insects, Chinese Academy of Forestry, Kunming 650224, Yunnan, China
  • 2. Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

Abstract: Three harvesting models (cutting the trunk and harvesting upper branches and leaves, retaining the trunk and harvesting upper branches and leaves, retaining the trunk and harvesting lower branches and leaves) were tested to harvest six-years-old Taxus yunnanensis plantation in Maguan County of Yunnan Province. Each model consisted 3 harvesting intensities. Through one-year's continuous observation, the amount and dynamics of T. yunnanensis plantation leaves were analyzed. The results showed that with the increase of harvesting intensity, the amount of falling leaves increased for all the 3 harvesting models, and at the same time, the defoliation rate of older leaves showed an increasing trend over time. Harvesting can promote the increase in the amount of new leaves, but compared with harvesting the lower branches, harvesting the upper branches was more effective to promote the increase of new leaves. Harvesting would reduce spring leaf density, and improve autumn density. The overall density of new leaves showed no significant difference with different harvesting models. The leaf net amount increased with the recovery strength of 3 harvesting models. In order to harvest more branches and increase the net yield of leaves in the coming year, it is suitable to cut the trunk and harvest upper 3/4 branches and leaves of crown length, retain the trunk and harvesting upper 3/4 branches and leaves of crown length. The net amount of leave increment was 2.96 times and 3.00 time that of the control. Simultaneously, if the trunk is harvested, there would be more sprouts in the rest of crown. To sum up, cutting trunk and harvesting upper 3/4 branches and leaves of crown length would be the best harvesting model.

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