| 秦岭锐齿栎林叶内营养元素含量的时空分布 |
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| 引用本文： | 刘广全,土晓宁.秦岭锐齿栎林叶内营养元素含量的时空分布[J].西北林学院学报,1999,14(4):1-8. |
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| 作者姓名： | 刘广全 土晓宁 |
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| 作者单位： | 1. 西北林学院,陕西,杨陵,712100
2. 陕西省林业科学院,陕西,杨陵,712100 |
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| 摘 要： | 通过固定标准木、定期采样和化学测定,分析了秦岭锐齿栎林叶内营养元素含量的径阶、冠向、冠层、海拔和生长季节变化规律。结果表明:不同径阶、冠向叶内营养元素含量差异不大;N、P、K含量自冠顶向冠基递减,Ca 的变化相反,Mg 的变化不明显;叶内N、P、K、Ca 的含量随海拔上升而降低,Mg 的变化不大。展叶初期,叶内N、P、K、Mg 含量很高,随叶龄增加而降低,展叶期和落叶前期显著下降;Ca 的变化相反,且在落叶前达到峰值。叶内N、P、K、Mg 间存在显著的正相关,而Ca 与N、P、K、Mg 间呈显著的负相关;叶内N/P、N/K 较高,随叶龄增加而上升,且比N、P、K含量的季节变化更稳定;K/Ca 在展叶初期很高,继而迅速降低,随叶龄的增加降低趋于缓慢;K/Mg 在整个生长季节逐渐降低。叶内营养元素积累量与叶的生长发育有着密切的关系。同时给出了测定叶内营养元素含量的采样部位、时间和样本数量的建议。
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| 关 键 词： | 秦岭 锐齿栎林 叶内营养元素 分布 |
Temporal and Spatial Distribution of Foliage Nutrient Contents of Sharptooth Oak Stands in Qinling Mt. |
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| Liu Guangquan,Tu Xiaoning.Temporal and Spatial Distribution of Foliage Nutrient Contents of Sharptooth Oak Stands in Qinling Mt.[J].Journal of Northwest Forestry University,1999,14(4):1-8. |
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| Authors: | Liu Guangquan Tu Xiaoning |
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| Abstract: | The foliage nutrient contents of sharptooth oak stands in Qinling Mt. with different diameter classes, crown directions, crown layers, elevations and seasonal variation have been studied in this paper by fixed sampling trees, regular samplings and chemical analysis. The results showed: there were no evident differences of the contents of foliage nutrient elements among diameter classes or crown directions. The contents of N, P,K and Mg in leaves decreased gradually with foliage age and from top to base of the crown, whereas the content of Ca increased and reached summit before falling leaves. The contents of N, P, K and Ca in leaves cutted down by ascending elevation, but the content of Mg did not change. There were marked positive relativities among N, P, K and Mg in leaves, but negative relativities between Ca and N, P, K, Mg in leaves. N/P and N/K went steadily up with foliage age, whereas K/Mg went slow down, K/Ca was higher at the begining of leaves spreading, then gradually decreased. The accumulation of foliage nutrient elements was influnced by foliage development. The paper meanwhile gave a sampling suggustion of location, period and number for analysis of foliage nutrient situation. |
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| Keywords: | Qinling Mt Quercus aliena var acureserrata stands foliage nutrient contents distribution |
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