林分密度对兴安落叶松径向生长-气候关系的影响

韩新宇; 高露双; 秦莉; 庞荣荣; 刘鸣谦; 朱一泓; 田益雨; 张金

doi:10.12302/j.issn.1000-2006.202209007

韩新宇, 高露双, 秦莉, 庞荣荣, 刘鸣谦, 朱一泓, 田益雨, 张金

南京林业大学学报（自然科学版） ›› 2024, Vol. 48 ›› Issue (2) : 182-190.

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南京林业大学学报（自然科学版） ›› 2024, Vol. 48 ›› Issue (2) : 182-190. DOI: 10.12302/j.issn.1000-2006.202209007

研究论文

林分密度对兴安落叶松径向生长-气候关系的影响

韩新宇 ¹ ,
高露双 ¹^,^* ,
秦莉 ² ,
庞荣荣 ¹ ,
刘鸣谦 ¹ ,
朱一泓 ³ ,
田益雨 ⁴ ,
张金 ⁴

作者信息 +

Effect of stand density on radial growth-climate relationship of Larix gmelinii

HAN Xinyu ¹ ,
GAO Lushuang ¹^,^* ,
QIN Li ² ,
PANG Rongrong ¹ ,
LIU Mingqian ¹ ,
ZHU Yihong ³ ,
TIAN Yiyu ⁴ ,
ZHANG Jin ⁴

Author information +

文章历史 +

摘要

【目的】研究不同密度下兴安落叶松径向生长与气候因子动态关系,为全球变暖背景下兴安落叶松林可持续经营中合理的林分密度确定提供依据。【方法】根据林分密度指数(SDI)选取大兴安岭中北部地区低、中和高3种林分密度梯度兴安落叶松(Larix gmelinii)纯林为研究对象,采用Mann-Kendall检验确定研究区气温突变点,基于野外调查和树轮数据,分析气温突变点后各林分密度下兴安落叶松径向生长趋势,并利用皮尔森相关和滑动相关分析其与各气候因子的关系及稳定性。【结果】在气温突变点后,研究区域兴安落叶松生长出现增强和衰退趋势,且随着林分密度增加,树木生长衰退比例增高。高林分密度下兴安落叶松生长受抑制程度最高,1988—1990年平均生长变化率为-25%,处于衰退状态。林分密度改变了兴安落叶松生长对气候的响应关系,高密度下衰退组树木生长与8月标准化降水蒸散指数(SPEI)正相关关系最强(P<0.05),与夏季温度呈稳定的显著负相关关系(P<0.05)。研究区气候呈现明显暖干化趋势,而低林分密度兴安落叶松保持54%的生长增强比例,树木与温度由低密度下的正相关关系向高密度的负相关关系转变。【结论】气温发生显著改变后,随着林分密度增加,树木生长衰退比例增高。低密度林分对干旱的抵抗力较强,而高密度林分增强了树木生长对气候因子的敏感性。因此,较低林分密度可以减缓气候变暖对兴安落叶松生长带来的负面影响,调整林分密度成为减缓兴安落叶松林树木生长衰退趋势的必要经营措施。

Abstract

【Objective】 To develop a sustainable management plan for Larix gmelinii, which is influenced by climate change, it is crucial to understand the dynamic relationship between radial growth and climate in forests with different tree densities.【Method】 Based on the stand density index, nine plots with three density levels (low, middle, high) were established in the central and northern Greater Khingan Mountains. Tree cores of L. gmelinii were collected during a field investigation. The Mann-Kendall test method was used to determine the turning point of temperature in the study area. To examine the radial growth trend of L. gmelinii, negative exponential function detrending and a linear function fitting were applied. Then, a Pearson correlation and sliding correlation were used to analyze whether the relationship between the radial growth and climate factors under each stand density remained stable after the temperature turning point.【Result】 The radial growth of L. gmelinii displayed trends of both enhancement and decline after the temperature turning point. The proportion of declining trees increased with increasing stand density. The growth of L. gmelinii was strongly inhibited when the stand density was high. Its average growth change rate reached -25% during 1988-1990, indicating a serious growth decline. Instead, the L. gmelinii trees in low density plots maintained a 54% growth enhancement ratio. Stand density may also influence the response of L. gmelinii growth to climate. Under a high stand density, the L. gmelinii growth of the decline group was positively correlated with the standardized precipitation evapotranspiration index in August (P<0.05) and negatively correlated with summer temperature (P<0.05), but under a low stand density, the growth of L. gmelinii was positively correlated with temperature. With the warming and drying trend in the study area, the relationship between tree growth and temperature shifted from positive to negative with increasing stand density.【Conclusion】 The proportion of declining trees increased with increasing stand density after the significant change of temperature. The impact of water limitation on growth was alleviated at a low stand density, while the trees in high density plots were more sensitive to climate factors. Reducing the stand density could mitigate the negative impacts of climate warming on the growth of L. gmelinii. Therefore, adjusting stand density is a necessary management operation to slow the declining trend of L. gmelinii.

导出引用

韩新宇, 高露双, 秦莉, 等. 林分密度对兴安落叶松径向生长-气候关系的影响[J]. 南京林业大学学报（自然科学版）. 2024, 48(2): 182-190 https://doi.org/10.12302/j.issn.1000-2006.202209007

HAN Xinyu, GAO Lushuang, QIN Li, et al. Effect of stand density on radial growth-climate relationship of Larix gmelinii[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2024, 48(2): 182-190 https://doi.org/10.12302/j.issn.1000-2006.202209007

中图分类号： S791

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