Several requirements of bamboo willow growth conditions
Zhu Liu is a selected willow and domesticated willow variety. Its morphology, lateral branches, dense planting similar to bamboo, named bamboo willow. It is an ideal tree species for industrial raw material forests, large-diameter timber cultivation, street trees, planting trees on all sides, landscaping, and farmland shelterbelts.
First, light
Excellent fast-growing species generally have higher photosynthetic intensity and photosynthetic efficiency to maintain rapid growth and high cellulosic content. All branches of bamboo will grow upward. The angle between the lateral branches and the trunk will be small and the branches will be uniform. The tree morphology will have higher photosynthetic efficiency and more dense planting than other willows. Bamboo willow has a high photosynthesis intensity and grows rapidly in areas where the sun's sunshine duration is not less than 1400 hours during the growing season (in one type of area, the annual sunshine duration is 3200-330O hours).
Second, the temperature
The warm climatic conditions are conducive to the rapid growth of bamboo willow. The bamboo willow grows for a long period of time, and in August and September, it also has a large amount of growth. According to the results of trials in the north and south, there are two main effects of temperature:
1. Tolerance to low temperature capacity Bamboo willow seedlings can safely pass through winter, not depending on the ultimate low temperature, but before lending, lignification, and high temperature to low temperature gradient before falling leaves cannot be too large.
2. High-temperature-tolerance capacity If the temperature in the south is higher than 35°C, if the temperature difference between day and night is less than 10°C, there may be thermal dormancy. During this period, the growth of seedlings will be reduced. When the temperature difference between day and night is greater than 10°C, bamboo willows will grow normally. Bamboo willows will tolerate low temperature below 30-35°C for a long period of time, but when shoots or saplings are not yet lignified, they are partially susceptible to local freezing injury. In the second year, the cold resistance significantly increased, and its growth was lower in the high-cold area than in the suitable areas where the bamboo willow grows. In the area below -10°C, the bamboo will grow normally.
Third, moisture
Zhuliu has strong resistance to flooding, and trials in the Yangtze River Basin indicate that the bamboo will tolerate more than two months but the top of the deep-water flood, or shallow water land afforestation throughout the year will not die, but the growth declines. Other fast-growing species flooded with anaerobic symptoms such as withered leaves for one month.
Moderate soil moisture with moderate bamboo growth rapidly, but when the soil moisture below 40% showed growth potential is inhibited, in the case of conditional irrigation, when the soil moisture dropped below 30%, timely irrigation, to ensure bamboo willow The normal rapid growth. Zhuliu has an obvious advantage in planting land on lakes and beaches, “four-side†courtyards where the soil moisture is ideal and the groundwater level is moderate.
Fourth, soil
Soil fertility: Zhuliuxi soil fertile land, soil organic matter content in the 4% -10% of the rapid growth of the land.
Soil structure: Bamboo willow soil porosity of 50%, breathable, good water retention in sandy loam soil growth rate is fastest, followed by sandy soil, clay.
Saline-alkali land: According to different saline-alkalinity tests in Dongying, Shandong, and Dagang, Tianjin, it is shown that fast-growing bamboo will grow normally under a pH of 8.5 and a salt content of 8 ,. The indicators perform well and are different from the saline-alkaline soil in the same area. Not great. In the same salt-bearing plot, the growth of bamboo will depend on the content of nutrients in the plot.
For example, in the Tianjin test area, it can grow under the site conditions where the salt content exceeds 10‰. For other poplar varieties, soil salinity at 3‰ and PH value above 8 affect the survival rate and forest growth.
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