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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
0
(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.1672-352x.20170524.020
投稿时间:2016-12-07
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”(2015-GDTK-07)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 twenty-four 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 twenty-four 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

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