Naturalsoilfertility is dropping in many areas because of continuous industrial fertiliser and pesticide use, while the growth of algae is increasing in lakes because of the fertiliser run-off.
As the management term of pure bamboo stands prolonged the naturalsoilfertility declined, which resulted from the growth characteristics of pure bamboo forest and the management methods.
毛竹纯林随经营期的延长，其土壤的自然肥力呈下降趋势，这是毛竹纯林的生长特性和经营方式决定的。
3
Naturalsoilfertility is dropping in many areas because of continuous industrial fertilizer and pesticide use, while the growth of algae is increasing in lakes because of the fertilizer run-off.