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    抚育间伐对云南松非结构性碳和化学计量特征的影响

    Effects of tending and thinning on non-structural carbon and stoichiometric characteristics of Pinus yunnanensis

      摘要
    • 摘要:
        目的  探究抚育间伐对云南松各个器官非结构性碳（NSC），以及碳（C）、氮（N）、磷（P）化学计量学特征的影响机制。
        方法  以云南省永仁县国有林场白马河林区云南松中龄林为研究对象，设置间伐（间伐强度为35.4%）与对照样地，分析抚育间伐对云南松非结构性碳和化学计量特征的影响。
        结果  （1）抚育间伐显著影响云南松针叶和枝的NSC含量（P < 0.01），对根NSC含量则无显著影响。抚育后枝NSC含量增长9.30%，而针叶NSC含量减少3.57%。（2）抚育间伐对云南松枝C含量、针叶和干P含量有显著影响（P < 0.05），对针叶N含量有极显著影响（P < 0.01），但对根的C、N、P含量没有显著影响。抚育后云南松枝中C含量增加12.93%；针叶中N含量增长18.04%；叶和干中P含量分别降低了27.78%、55.56%。（3）云南松NSC、CNP化学计量学特征在各个器官之间表现出显著差异（P < 0.05）。相关性分析表明：针叶和根P含量与可溶性糖含量呈显著正相关（P < 0.05），而叶中C含量则和可溶性糖含量显著负相关（P < 0.05）。
        结论  抚育间伐能促进云南松干、枝和根NSC含量以及各器官C含量的积累，降低叶NSC和各器官P含量，改变C、N、P在各器官中的分布格局；该地区云南松人工林生长在一定程度上受N限制，适当配施N肥将促进林分质量的提高。

       

      Abstract:
        Objective  Our objective was to explore the mechanism of the effects of thinning on non-structural carbon (NSC), carbon (C), nitrogen (N) and phosphorus (P) stoichiometry of Pinus yunnanensis.
        Method  The middle-aged P. yunnanensis forests were chosen in the Baima River forest area of Yongren County, Yunnan Province of southwestern China, and two experimental sample plots of thinning (thinning intensity of 35.4%) and control were set up to analyze the effects of thinning on NSC and CNP stoichiometric characteristics of P. yunnanensis forests.
        Result  (1) Tending thinning significantly affected the NSC content of needles and branches of P. yunnanensis (P < 0.01), whereas no significant difference on roots was observed. In addition, the NSC content of branch increased by 9.30%, while the NSC content in needles decreased by 3.57%. (2) Thinning had a significant effect on C content of P. yunnanensis branch, P content in needles and stems (P < 0.05), and a highly significant effect on N content in needles (P < 0.01), however, no significant effect was observed on C, N and P content in roots. After thinning, the C content of P. yunnanensis branch increased by 12.93%; the N content in needles increased by 18.04%, and the P content in needles and stems decreased by 27.78% and 55.56%, respectively. (3) The NSC, CNP stoichiometric characteristics showed significant differences among P. yunnanensis organs (P < 0.05). Correlation analysis showed that the P content in needles and roots was significantly positively correlated with soluble sugar content (P < 0.05), while C content in needles was significantly negatively correlated with soluble sugar content (P < 0.05).
        Conclusion  Thinning promots the accumulation of NSC content in stem, branch and root and C content in each organ, whereas needle NSC and P content decreased in each organ, furthermore, distribution pattern of C, N and P in each organ was affected; the growth of P. yunnanensis plantation in this area was limited by N to some extent, and appropriate application of N fertilizer will promote the improvement of stand quality.

       

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