| 洪希群，陈欣凡，张 婵，张 斌，陈 灿，范海兰，林 晗.千年桐不同冠层叶片养分含量及养分再吸收比较[J].广东农业科学,2022,49(6):58-65 |
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千年桐不同冠层叶片养分含量及养分再吸收比较 |
| Comparison of Leaf Nutrient Content and Nutrient Resorptionin Different Canopies of Aleurites montana |
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| DOI：10.16768/j.issn.1004-874X.2022.06.008 |
| 中文关键词: 千年桐 冠层 养分再吸收 凋落叶 养分循环 生态林 |
| 英文关键词: Aleurites montana canopy nutrient resorption litter leaf nutrient cycling ecological forest |
| 基金项目:福建省科技计划项目（KTP21116A）；福建省林业厅种业创新项目（KLb21009B）；福建省水土保持
试验站项目（KH190193A，KH220045A） |
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| 中文摘要: |
| 【目的】分析千年桐不同冠层叶片养分含量和养分再吸收率的差异，研究千年桐叶片养分再吸收
率与叶片养分含量、土壤养分含量的关系。【方法】以低产低效针叶林皆伐后营造的千年桐近自然经营生态林
为试验对象，测定生长高峰期（7 月）和衰老凋落期（10 月）千年桐不同冠层叶片氮（N）、磷（P）、钾（K）、
钙（Ca）、镁（Mg）含量。【结果】叶片主要养分 N、P、K、Ca、Mg 均表现为衰老叶养分含量显著低于成熟叶，
衰老叶并未出现养分富集现象。成熟叶和衰老叶均呈现冠层上部叶片 N 含量显著大于冠层下部，成熟叶冠层上
部 K 含量显著高于冠层下部。Ca 再吸收率显著低于其他养分，仅有 14.935（±3.191）%。除了 Mg 在冠层下部
的再吸收率显著高于冠层上部，其他叶片养分再吸收率在上下冠层之间差异不大。千年桐 K 再吸收率与衰老前
后叶片 K 含量均呈显著负相关，Ca 再吸收率与成熟叶 Ca 含量呈显著正相关。叶片 N 再吸收率与土壤水解 N 呈
显著正相关；叶片 K 再吸收率与土壤全 K 呈显著负相关，而与土壤速效 K 呈显著正相关。【结论】千年桐叶片
主要养分均表现为衰老叶养分含量显著低于成熟叶，养分再吸收与叶片及土壤养分具有一定的关联。研究结果
可为进一步探索生态公益林的养分循环机制提供科学依据。 |
| 英文摘要: |
| 【Objective】The differences in leaf nutrient content and nutrient resorption efficiency of different canopies
of A. montana forest were analyzed, and the relationship between A. montana leaf nutrient resorption efficiency and nutrient
contents in leaves and soil was studied.【Method】The Aleurites montana forest, planted after the coniferous forests with
low production being cut down and cultivated as ecological forest conforming to the nature, was taken as test materials.
The contents of nitrogen (N) , phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) in leaves of the upper and
lower canopies of A. montana were determined in the peak vegetative period (July) and the defoliating period (October). 【Result】The macronutrients N, P, K, Ca and Mg in senescent leaves were significantly lower than those in mature leaves
and there was no nutrient enrichment in senescent leaves. The N contents of mature and senescent leaves in the upper canopy
were significantly higher than those in the lower canopy. The K content in mature leaves of upper layer was significantly
higher than that in the lower canopy. Ca resorption efficiency was significantly lower than that of other nutrients, with only
14.935 (±3.191) %. In addition, the resorption efficiency of Mg in the lower canopy was significantly higher than that in the
upper canopy. There was no significant difference in the resorption efficiencies of other nutrients between upper and lower
canopies. There was a significant negative correlation between K resorption efficiency and K content in mature and senescent
leaves, and a significant positive correlation between Ca resorption efficiency and Ca content in mature leaves. There was a
significant positive correlation between N resorption efficiency and soil hydrolyzed nitrogen. The K resorption efficiency was
negatively correlated with soil total K content, but positively correlated with soil available K content.【Conclusion】The
nutrient contents in senescent leaves of A. montana were significant lower than those in mature leaves, and there was a certain
correlation between nutrient resorption efficiency and nutrients in leaves and soil. The study results could provide a scientific
basis for further exploring the nutrient cycling mechanism of ecological public welfare forests. |
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