Intra-annual growth dynamics of Picea meyeri needles, shoots, and stems on Luya Mountain, North-central China
Intra-annual growth dynamics of Picea meyeri needles, shoots, and stems on Luya Mountain, North-central China
复制标题
芦芽山云杉针、芽、茎的年内生长动态
DOI：
10.1007/s00468-020-02065-9
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发表时间：
2021-01-02
影响因子：
2.3
通讯作者：
Xu, Hui
中科院分区：
文献类型：
--
作者：
Ding, Xinyuan;Jiang, Yuan;Xu, Hui
一个固定的顺序存在于顶端和径向生长之间的关键阶段的时间。在发病阶段，径向生长与顶端生长高度相关，但在高峰期或停止阶段不相关。摘要针叶树顶径生长的时间关系因树种和立地而异，其生长对气候变化的不同响应很少被揭示。研究了芦芽山白云杉（Piceameyeri）顶径生长的时间序列和相关性，以及两种生长类型对短期气候的响应。对3个样地的地上生长季节动态进行了监测，并对两个生长季的气候条件进行了对比。结果表明：（1）无论地点或年份，杉木生长均表现为先开始茎生长，然后是针叶和新梢生长;茎生长最高，最后停止，然后是新梢生长，最后才是针叶生长。茎的生长与针叶和新梢的生长在发病期高度相关，但在高峰期或停止期不相关。(2)这三个器官在温暖的年份（2017年）比寒冷的年份（2016年）表现出相似的早期生长开始和高峰，尽管没有观察到一致的早期生长停止，并且前者的生长增量并不显著大于后者。茎生长表现出较长的持续时间，较低的相对速率，和更大的增量比地上部和针叶生长的变化，无论网站和年。这些结果表明：（1）顶生和径向生长的关键生长期的时间顺序是一致的（径向生长与顶生并不总是相关的，至少在生长高峰期和生长停止期是如此）;（2）在生长停止期，三个器官对温度的物候反应并不一致。无论是顶端还是径向的增长，增强了短期变暖，径向增长可能比顶端的增长更容易受到气候变化的影响。
Key message A fixed sequence existed in the timing of critical stages between apical and radial growth. Radial growth was highly correlated with apical growth during the onset stage but not during the peak or cessation stages. Abstract The temporal relationships between the apical and radial growth of conifers may vary with species and site, and the varied responses of growth to climate change have rarely been revealed. We studied the temporal sequences and correlations between the apical and radial growth of Picea meyeri and the responses of the two growth types to the short-term climate of Luya Mountain, North-central China. The seasonal dynamics of aboveground growth at three sites were monitored, and the climate conditions of two growing seasons were contrasted. The results showed that (1) stem growth was initiated first, followed by needle and shoot growth; stem growth peaked and ceased last, followed by shoot growth and then needle growth, regardless of site or year. Stem growth was highly correlated with needle and shoot growth during the onset stage but not during the peak or cessation stages. (2) The three organs showed a similar earlier growth onset and peak in the warmer year (2017) than in the colder year (2016), although consistent earlier growth cessation was not observed, and growth increments were not significantly greater in the former than in the latter. Stem growth showed a longer duration, lower relative rate, and larger increment variability than shoot and needle growth, irrespective of site and year. These results suggested that (1) there was a consistent temporal sequence of the timing of critical growth periods between apical and radial growth (radial growth was not always linked to apical growth, at least during the peak and cessation growth periods) and (2) the three organs did not show consistent phenological responses to temperature during the growth cessation stage. Neither apical nor radial growth was enhanced by short-term warming; radial growth was probably more susceptible than apical growth to climate change.