Lu Lijie, Yu Lingxue, Li Xuan, Gao Li, Bao Lun, Chang Xinyue, Gao Xiaohong, Cai Zhongquan
State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
Faculty of Computing, Harbin Institute of Technology, Harbin 150006, China.
Plants (Basel). 2025 Jan 6;14(1):143. doi: 10.3390/plants14010143.
Studying climate change's impact on vegetation canopy growth and senescence is significant for understanding and predicting vegetation dynamics. However, there is a lack of adequate research on canopy changes across the lifecycles of different vegetation types. Using GLASS LAI (leaf area index) data (2001-2020), we investigated canopy development (April-June), maturity (July-August), and senescence (September-October) rates in Northeast China, focusing on their responses to preseason climatic factors. We identified that early stages saw canopy development acceleration, with over 71% of areas experiencing such acceleration in April and May. As the vegetation grew, the accelerating canopy development slowed down, and the canopy reached its maturation earlier. By analyzing the partial correlation between canopy growth and preseason climatic factors, it was identified that changes in canopy growth were most significantly affected by preseason air temperature. A positive correlation was observed in the early stages, which shifted to a negative correlation during canopy maturation and senescence. Notably, the transition timing varied among different vegetation types, with grasslands (June) occurring earlier than forests (July) and farmlands (August). Additionally, grassland canopy growth showed a stronger response to precipitation than forests and farmlands, with a lagged effect of 2.50 months. Our findings improve understanding of vegetation canopy growth across different stages, holding significant importance for ecological environmental monitoring, land-use planning, and sustainable development.
研究气候变化对植被冠层生长和衰老的影响对于理解和预测植被动态具有重要意义。然而，目前缺乏关于不同植被类型在整个生命周期中冠层变化的充分研究。利用GLASS叶面积指数（LAI）数据（2001 - 2020年），我们调查了中国东北地区冠层发育（4月至6月）、成熟（7月至8月）和衰老（9月至10月）速率，重点关注它们对季前气候因素的响应。我们发现，早期阶段冠层发育加速，4月和5月超过71%的区域出现这种加速情况。随着植被生长，冠层发育加速减缓，冠层更早达到成熟。通过分析冠层生长与季前气候因素之间的偏相关性，确定冠层生长变化受季前气温影响最为显著。早期阶段呈正相关，在冠层成熟和衰老阶段转变为负相关。值得注意的是，不同植被类型的转变时间不同，草地（6月）早于森林（7月）和农田（8月）。此外，草地冠层生长对降水的响应比森林和农田更强，滞后效应为2.50个月。我们的研究结果增进了对不同阶段植被冠层生长的理解，对生态环境监测、土地利用规划和可持续发展具有重要意义。
