不同树龄单株苹果树树冠遮阴范围分析

doi:10.16843/j.sswc.2018.02.007

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Abstract [Background] Agroforestry complex system has obvious ecological benefits of soil and water conservation in the Loess Plateau region. Recently, the research about agroforestry complex focused on the competition of water and nutrient, and neglected effects of solar radiation. Solar radiation is energy sources of intercropping, and crown shading should be focused in agroforestry complex system. Jinxi is a typical Loess Plateau region, where agroforestry complex is widely used. Thus, this study, measuring crown shadings of different age's (4 years, 5 years, 6 years, and 7 years) apple trees in Jinxi Loess Plateau area, aims to explore shading range that is shade area at corresponding moment within a day, repeated shading area that is an area continuously covered by apple tree crown within a day, and lasting shading time in a repeated shading area on different ages apple tree.[Methods] Based on similarity principle in parallel solar rays, the research established 3D apple tree model by reducing the 50 times of an actual apple. Apple tree shading range in a day was measured using the 3D tree. The shade was described based on the shadow of the 3D apple tree model in solar rays. The drawing describing shade range was imported to computer, and combining the software of CAD and MATLAB, the crown shade of apple tree within a day was analyzed.[Results] 1) As for the tree planting configuration with the plant spacing was 4 m×5 m,5 m×5 m in the study area, the 4-7 years apple trees had mutual shading overlap between apple trees, but no mutual shading overlap occurred between rows. The research about multiple apple trees configuration should focus on apple trees in economic tree and crop intercropping system. 2) The crown shading area of the apple tree in north side was always greater than that in the south side. Consequently, planting intercrops at the same distances in north and south side of apple trees was not reasonable in economic tree and crop intercropping system. When designing the row distance of intercrop, we must consider the effect of apple tree crown shading area. In the study, the reasonable intercrop planting distance was determined through analyzing apple-tree crown shading area, repeated shading area, and lasting shading time. 3) Because repeated shading area continuously increased with the increase of an apple tree age, which resulted in the competition of solar rays between tree and crop rose with the aging of the tree. While the crown shading area of an apple tree is getting closer to the apple tree, the shading time of the shading area increased. Therefore, the competitiveness for solar rays between tree and crop became growingly significant with the crown shading area was toward to the tree. And the major shading time should be in 9:00-15:00 within a day, and this moment was the important in a day.[Conclusions] Intercrop planting should be determined based on shading area in economic tree and crop intercropping system. And planting area of intercropping is different in economic tree and crop intercropping system with different ages' apple trees. The research provides support about reasonable planting distance of intercrop in economic tree and crop intercropping system.

Key words： individual apple tree different tree age shading area shading time repeated shading

Received: 20 December 2017

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S157

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	Articles by authors
	WANG Jingjing
	BI Huaxing
	SUN Yubo
	DUAN Hangqi
	PENG Ruidong

Cite this article:

WANG Jingjing,BI Huaxing,SUN Yubo, et al. Shade range analysis of apple tree crown in different ages[J]. SSWC, 2018, 16(2): 47-54.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.02.007 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I2/47

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