The results showed that the change of root population 32P absorption vigour is significantly related to canopy apparent photosynthetic rate (r=0. 8163*), its optimum regression equation is y=2. 050 + 1. 641x.
Field Studies on the canopy characters of highyielding peanut of 9,225 kg/ha showed: (1) The leaf area index (LAI) of peanut fitted the equation of y=0.2354-0.0489x+0.003x2-0.00002x3. The peak value (LAI >5) appeared from late July to early August.
The results indicated that the canopy interception were 34.83%,13.05%,19.61%,the stem-flow were 6.79%,0.58%,4.01%,the throughfall were 58.37%,86.18%,77.66% of Pinus koraiensis,Larix gmelinii,weed trees,respectively.
It was shown that the interception of rainfall in canopy of main forest types is about 16.2—29.1%, litter storage is 10—12 t/ha, its minimum water-holding capacity is equivalent to the rainfall in 3—6mm, the interception of mainfall in litter is 5.6—13.1%.
The average area of expand gap (EG) and canopy gap (CG) were 469.42 m~2 and 181.90 m~2 respectively, the area percentage of both in the forest landscape were 28.23% and 10.49% respectively, and annual natural disturbance frequency of both were (0.672 1%) and 0.247 9% respectively.
In a clear and sunny day, the light intensity received by the fruit on southwest canopy was 600-1260μmol穖-2穝-1 more than those from northeast, east, north and northwest exposures, and the maximum fruit surface temperature was 5-6.5℃ higher than other direction exposures.
Using gird system and layer methods, the characteristics of canopy structure and the patterns of light distribution in the 8 year old trees in four different high densities(4 m×3 m,3 m×2 5 m,3 m×2 m,3 m×1 5 m) orchards of chestnut( Castanea mollissima ) were studied in Xin Yi county, Jiangsu province.
Based on the basic principles of the micrometeorology of atmospheric boundary layers and vegetation canopy, a numerical model of the interaction between forest ecosystems and atmospheric boundary layers was developed.
At the same time, better correlative relationship between runoff and sediment production and rainfall and rainfall intensity were testified by multiple regression, but the correlation decreased gradually with the increase of canopy density of forest.
Thirdly, based on gray cognate analyses of factors affecting runoff and sediment production in sloping land, the factors of stand canopy density and herb and litter biomass were the most significant ones, whose gray incidence degree exceeded 0.6.
Correlations between canopy gaps and species diversity in broad-leaved and Korean pine mixed forests
Regeneration of tree species associated with canopy gaps in broad-leaved Korean pine forests was investigated.