Interannual variability of leaf area index of an evergreen conifer stand was affected by carry-over effects from recent climate conditions.
Interannual variability of leaf area index of an evergreen conifer stand was affected by carry-over effects from recent climate conditions.
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DOI：
10.1038/s41598-018-31672-3
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发表时间：
2018-09-11
影响因子：
4.6
通讯作者：
Miyaura T
中科院分区：
文献类型：
--
作者：
Sumida A;Watanabe T;Miyaura T
尽管叶面积指数(LAI)与森林生产力相关，但很少有人研究常绿林分叶面积指数的年际变化及其与林分生长和气象因子的关系。我们用异速生长的方法估计了一个常绿针叶树(Chamaecyparis Obtusa)林分19年来叶面积指数的变化。叶面积指数在7.1~8.8 m2 m−2之间变化，19年间95%的可信区间为1.1 m2 m−2。维持这一叶面积指数范围，使得最大树的叶面积(LA)的逐渐增加抵消了最小树的叶面积的逐渐减少。同时，在夏季降水量较少的年份，更多的树木表现出LA值的暂时下降。叶面积指数与当年7、8月平均气温呈弱相关，相关系数随叶面积指数与近6年移动平均气温的相关而增大(r = =0.93)，与冠层叶片周转时间的估计值一致。树干生物量年生长量与夏季降水量呈显著正相关，与叶面积指数无显著相关。这些结果将有助于完善森林生长和全球气候变化研究中的模型。
Despite the relevance of leaf area index (LAI) to forest productivity, few studies have focused on the interannual variability of LAI of an evergreen stand and its relationship with stand growth and meteorological factors. We estimated the change in LAI of an evergreen conifer (Chamaecyparis obtusa) stand over 19 years from a dataset using allometric methods. The LAI varied between 7.1 and 8.8 m2 m−2, with a 95% confidence interval of <1.1 m2 m−2 over the 19 years. This LAI range was maintained such that the gradual increase in leaf area (LA) of the largest trees counterbalanced the gradual loss in LA of the smallest trees. Meanwhile, more trees showed a temporary decrease in LA in years with low summer precipitation. The LAI and current-year mean temperature for July and August (TJA) were weakly correlated, whereas the correlation coefficient increased (r = 0.93) when LAI was correlated with the moving average TJA over the previous 6 years, which agreed with the estimated turnover time of canopy foliage. The annual stem biomass growth rate was significantly positively correlated with summer precipitation, but not with LAI. These results will be useful for refining models in studies on forest growth and global climate change.
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影响因子：
1.7
作者：
Leuschner, Christoph;Voss, Sylvia;Clases, York
通讯作者：
Clases, York
影响因子：
2.2
作者：
GHOLZ H L;FITZ F K;WARING R H
通讯作者：
WARING R H
在中国云南省的亚热带季风宽阔的常绿森林中，由季节和物种调节的非结构性碳水化合物。
影响因子：
4.6
作者：
Liu W;Su J;Li S;Lang X;Huang X
通讯作者：
Huang X
影响因子：
4.2
作者：
Hikosaka, K
通讯作者：
Hikosaka, K
影响因子：
6.7
作者：
Ellis, T. W.;Hatton, T. J.
通讯作者：
Hatton, T. J.