资源环境科技发展态势分析平台

Appropriate fertilization practice is crucial to increase nitrogen (N) recovery efficiency and decrease N loss. Our aim is to determine the appropriate fertilization placement and the target age in moso bamboo forests. A field experiment was conducted to determine the effects of application methods (furrow and hole) and depths (0-20 and 20-40 cm) on the fate of urea-N-15 in moso bamboo forests. The N-15 tracer technique was used to investigate the fates of the applied N-15 fertilizer. The largest biomass was obtained from the bamboo culm (42.25-54.09%), but the maximum absorption and N content occurred in the leaves (28.86-39.31%). The N recovery efficiency of urea-N-15 was significantly higher for deep applications (30.62-31.14%) than for shallow applications (26.68-27.49%), whereas no significant difference was found between the furrow and hole applications. The residual N-15 was mainly concentrated in the fertilized soil layer, and the residual N-15 recovered from the 0-60 cm soil layer was 16.29-19.47%. The highest N recovery efficiency (31.34%) and lowest N loss (49.91%) were observed for the furrow application at 20-40 cm. In addition, the N competitive ability and N recovery efficiency of the I du (moso bamboo age, 1-2 years old) bamboo were 0.069 mg kg(-1) d(-1) and 13.29%, respectively, which were significantly higher than those of the other ages. Therefore, furrow application at depth of 20-40 cm is recommended for practical applications, and the I du bamboo should be the target of fertilization in moso bamboo forests.