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外源性氮和磷对尾叶桉凋落叶分解的影响 
佘汉基,郑欣颖,薛立,蔡金桓 

(华南农业大学林学与风景园林学院，广州 510642) 

摘要: 
通过研究外源性氮和磷对尾叶桉（Eucalyptus urophylla）凋落叶分解速率、分解过程中N、P含量变化的影响，为森林养分管理提供科学依据。采用尼龙网袋分解法，在广东的尾叶桉林内建立4块5 m × 5 m 的小样地，放置凋落叶样品，测定其分解速率和N、P含量变化。结果表明，外源性N在试验前期分解速率有促进作用，后期阻碍了凋落叶分解。24个月时对照、施N、P和N+P的凋落叶残留量分别为初始重量的0.23%、1.59%、0.19% 和0.49%。凋落叶分解24个月时尾叶桉林地各处理的凋落叶N、P含量均大于初始值，对照、施N、P和N+P的凋落叶N的残留量分别为初始N重量的0.54%、2.41%、0.35%和0.81%，凋落叶P的残留量分别为初始P重量的0.48%、1.74%、0.56%和1.52%，表明4种处理的凋落叶N和P均为释放模式。施N抑制尾叶桉凋落叶的分解, 而施P及N+P促进其凋落物的分解，表明施用P肥可以促进尾叶桉凋落叶的分解和养分循环。 
关键词: 尾叶桉 分解；凋落叶；外源性N和P；养分释放 
DOI：10.13610/j.cnki.1672352x.20170524.020 
投稿时间：20161207 
基金项目:中央财政林业科技推广示范项目“广东省生态公益林培育技术推广”（2015GDTK07）资助。 

Effects of N and P additions on decomposition of leaf litter in a Eucalyptus urophylla stand 
SHE Hanji,ZHENG Xinying,XUE Li,CAI Jinhuan 
(College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642) 
Abstract: 
The effects of external nitrogen and phosphorus on leaf litter decomposition in a Eucalyptus urophylla woodland were studied for providing a scientific basis for E. urophylla nutrient management. The study was conducted over 2 years using the litterbag technique in Yongyun Forest Farm, Guangdong Province, China. Four small sample plots (5 m ×5 m) were established in the investigated stand. Within each of the sample plots, leaf litters were placed and their decomposition rates and N, P and K contents were analyzed. The results showed that addition of N improved litter decomposition in the early stage and impeded litter decomposition in the late stage of the experiment. After twentyfour months of decomposition, the remaining weight of leaf litter was 0.23%, 1.59%, 0.19% and 0.49% of the initial weight of leaf litter in CK, N addition, P addition and N+P addition treatments, respectively. After twentyfour months of decomposition, the N and P contents in leaf litter were greater than their initial values, and the remaining N weight of leaf litter was 0.54%, 2.41%, 0.35% and 0.81% of the initial N weight in four treatments, respectively. The remaining P weight of leaf litter was 0.48%, 1.74%, 0.56% and 1.52% of the initial P weight in CK, N addition, P addition and N+P addition treatments, respectively, indicating that N and P release patterns exist in decomposing leaf litter. In a word, N addition delays decomposition of leaf litter, whereas addition of P or N+P accelerates its decomposition; therefore application of P?fertilization can improve litter decomposition and nutrient cycling. 
Key words: Eucalyptus urophylla decomposition leaf litter N and P additions nutrient release 




