Effects Of Bag Controlled Release Fertilizer On Ecology And Environment Of Lei Bamboo Plantation

Bag controlled release fertilizer changed the traditional fertilization pattern.The fertilizer was packed in biodegradable material to control the release rate.In this experiment,the effects of bag controlled release fertilizer and traditional fertilization on the growth of Phyllostachys violascens were studied in field.The relationship between soil nutrient contents and leaf nutrient contents,the effects of bamboo age and different fertilization rates on physiological and biochemical indicators of soil and Lei bamboo and the effect of bag controlled release fertilizer on reducing nutrient loss in field were studied.It is expected that we can provide theoretical and technical support for the new management of Lei bamboo forest.The main results of this paper are as follows:1.The relations between available nutrient content in soil and total nutrient content in leaves under traditional intensive management conditions showed that the total nutrient content in plants increased firstly and then decreased when the available nutrient contents in soil increased.When the available nutrient contents in soil reached a certain value,there was no significant positive correlation between total nutrient contents in leaves and available nutrient contents in soil.2.The main nutrient content in soil of bag controlled release fertilizer treatment was in 10-40 cm,and that in spraying fertilizer treatment was in 0-20 cm.After intensive management,the nitrogen and potassium contents of leaves in Lei bamboo forest had no significant differences under different treatments.The phosphorus content in 1500 kg/hm² bag controlled-release fertilizer treatment had no significant differences with the 3000 kg/hm² spraying fertilizer and 3000 kg/hm² bag controlled-release fertilizer treatments’.But there was no significant differences between the phosphorus content in 1500kg/hm² fertilizer and the phosphorus content in no fertilizer treatments.The fluorescence ability of leaves in the 1500 kg/hm² bag controlled release fertilizer was the strongest,which means the bamboo can better use light energy.3.The contents of nitrogen and phosphorus in runoff and leachate from the bamboo forest varied in a peak shape with time.In runoff,the total nitrogen and phosphorus contents under the treatment of bag coated fertilizer were reduced by 18.75%and 40.94%compared with the control.While in leachate,the total nitrogen and phosphorus contents were lower than the control by 15.36%and 22.91%.Futhermore,the amount of ammonia volatilization lost from bag-coated fertilizer treatment was lower than that of the control by 32.08%.Therefore,the method of bag-coated fertilizer application should be effective in preventing nitrogen and phosphorus loss and subsequently increase the fertilizer use efficiency in the bamboo forest.4.The contents of total nutrient in different Lei bamboo leaves were different.The nutrient content in 1-year-old bamboo leaves was significantly higher than other years’.And the PI_ABS of 1-year-old Lei bamboo leaves was 35.62%and 58.16%higher than that of 2-years-old and 3-years-old leaves.5.The contents of Lei bamboo leaves under different fertilization level were different.The results showed the contents in leaf increased with the increasing of fertilization amount in a certain range.When 7 bags controlled release fertilizer were applied in field,the nutrient contents in the leaves of Lei bamboo rising firstly and then decreasing.Several months later,there are coercive phenomena between the nutrient contents in soil and leaves under 7 bags controlled release fertilizer treatments.And the fluorescence capacity in 3 bags controlled-release fertilizer treatments was the best among all treatments.