Optimization method for protective coast-forest belt canopy structure

An optimization method and technology for shelter forests, applied in forestry, afforestation, climate change adaptation, etc., can solve problems such as dryness, damage to horizontal structure, and lack of technical achievements.

Active Publication Date: 2016-01-20
RES INST OF SUBTROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0002] In the 1970s and 1980s, my country began to build coastal shelterbelts on a large scale. At present, these artificial shelterbelts have reached a mature stage, and some even appear over-ripe, resulting in aging, death or even broken shelterbelts. At the same time, due to the salt The natural environment such as alkali, typhoon and waterlogging is harsh, and there are a large number of inclined, lodging and dry trees in the shelterbelt belt.
Affected by the above internal and external factors, the vertical structu

Method used

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  • Optimization method for protective coast-forest belt canopy structure

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Embodiment 1

[0027] In this embodiment, the applicant selects the 37-year-old Metasequoia shelter belt in Renmintang, Pudong New Area, Shanghai as the object. The original row spacing is 2m × 3m or 3m × 3m, a single canopy forest belt, and the porosity of the trunk layer is relatively large. There are few lower plants, mainly herbaceous plants, with a canopy index > 3, and the protection effect is poor.

[0028] For the shelterbelt, the inventor optimized it based on the optimization method he developed, and the specific optimization process is as follows.

[0029] The clearing of the forest belt is mainly to clear some of the average trees and all the lodging trees of the main tree species in the forest belt, reduce the density of the original single canopy, and control the density of the original stand within 1000 trees / ha. It should be noted that the present invention not only needs to clean up lodging trees, but also cleans up average trees. The average trees mentioned here refer to in...

Embodiment 2

[0039] In the present embodiment, in the black pine shelter belt, adopt the method similar to embodiment 1, and the tree species that are replanted are adjusted, specifically, the arbor tree species of planting mainly select Quercus japonica and white wax, and the ratio is 4:1, the main shrub species are Amorpha fragrans and Vitex unileaf, the ratio is 3:1. After optimization, the canopy index of the shelter belt was optimized from 4.22 to 1.27, and the effective protection distance was increased from 7.1H to 10.3H. The effective protection distance has been increased by 45%, which is beyond expectations, exceeding the initial maintenance target of the maintenance personnel, and much larger than the improvement ratio in Example 1. Illustrate that the selection ratio of tree species is extremely successful, fully exerting the effect of the optimization method of the present invention.

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Abstract

The invention provides an optimization method for a protective coast-forest belt canopy structure. The method comprises the steps of clearing average trees and lodging wood of a target protective forest belt and replenishing and planting trees in canopy gaps or forest gaps to realize the optimization of a protective forest belt canopy index and the canopy structure. By adopting the optimization method provided by the invention, reforestation survival rate can be remarkably improved, the protective forest belt canopy index can be effectively reduced, and efficient protection distance can be improved. For instance, in one embodiment of the invention, the reforestation survival rate reaches up to more than 90 percent; five years later, the protective forest belt canopy index is optimized to 1.96 from 3.35, big tree proportion is adjusted to 59.66 percent from 80.12 percent, the efficient protection distance is increased to 10.5H (H is the mean height of trees of the protective forest belt) from 8.6H. Thus, the optimization method for a canopy provided by the invention can effectively improve the protection distance by more than 20 percent in medium or short terms.

Description

technical field [0001] The invention relates to the field of tree planting, in particular to a canopy structure optimization method for coastal protection forest belts. Background technique [0002] In the 1970s and 1980s, my country began to build coastal shelterbelts on a large scale. At present, these artificial shelterbelts have reached a mature stage, and some even appear over-ripe, resulting in aging, death or even broken shelterbelts. At the same time, due to the salt The natural environment such as alkali, typhoon and waterlogging is harsh, and there are a large number of inclined, lodging and dry trees in the shelter belt. Affected by the above-mentioned internal and external factors, the vertical structure of the forest belt community canopy is simple, but the horizontal structure is seriously damaged, resulting in low protection function of the forest belt. [0003] The phenomenon that the single canopy structure of shelterbelts leads to low protective functions i...

Claims

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Application Information

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IPC IPC(8): A01G23/00A01G17/00
CPCA01G17/005A01G23/00Y02A40/22Y02P60/40
Inventor 吴统贵虞木奎王金宝张雷张慧张鹏
Owner RES INST OF SUBTROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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