外源性氮和磷对尾叶桉凋落叶分解的影响

发布时间：2019-04-30 13:37

【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。
[Abstract]:In order to provide scientific basis for forest nutrient management, the effects of exogenous nitrogen and phosphorus on the decomposition rate and N, P content of (Eucalyptus urophylla) litter in Eucalyptus urophylla (Eucalyptus urophylla) were studied. Using nylon mesh bag decomposition method, four plots of 5 m 脳 5 m were set up in eucalyptus taurophylla forest in Guangdong Province, and litter samples were placed. The decomposition rate and N, P content of litter samples were measured. The results showed that exogenous N promoted the decomposition rate of litter at the early stage of the experiment, and hindered the decomposition of leaf litter at the later stage of the experiment. At 24 months of control, P and N P were 0.23% and 1.59% of the initial weight, respectively, and the leaf residue of P and N P were 0.23% and 1.59% of the initial weight respectively. 0.19% and 0.49%. When litter decomposition lasted 24 months, the N content of litter in each treatment of eucalyptus caudata forest was higher than the initial value. The residual N content of P and N P was 0.54% and 2.41% of the initial N weight, respectively, when N was applied to the control, and the N content of litter N in each treatment of Eucalyptus caudata forest was higher than the initial value. 0.35% and 0.81% of the litter P residues were 0.48%, 1.74%, 0.56% and 1.52% of the initial P weight, respectively. Application of N inhibited the decomposition of litter of Eucalyptus caudata, while P and N P promoted the decomposition of litter, which indicated that P fertilizer could promote the decomposition and nutrient cycle of litter of Eucalyptus caudata.
【作者单位】：华南农业大学林学与风景园林学院;
【基金】：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
【分类号】：S714

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