Wang Xianxian, Chen Xiaohong, Xu Jiali, Ji Yuhui, Du Xiaoxuan, Gao Jie
College of Life Sciences, Xinjiang Normal University, Urumqi 830054, China.
Coastal Agriculture Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea.
Plants (Basel). 2023 Aug 1;12(15):2843. doi: 10.3390/plants12152843.
The allocation of biomass reflects a plant's resource utilization strategy and is significantly influenced by climatic factors. However, it remains unclear how climate factors affect the aboveground and belowground biomass allocation patterns on macro scales. To address this, a study was conducted using aboveground and belowground biomass data for 486 species across 294 sites in China, investigating the effects of climate change on biomass allocation patterns. The results show that the proportion of belowground biomass in the total biomass (BGBP) or root-to-shoot ratio (R/S) in the northwest region of China is significantly higher than that in the southeast region. Significant differences ( < 0.05) were found in BGBP or R/S among different types of plants (trees, shrubs, and herbs plants), with values for herb plants being significantly higher than shrubs and tree species. On macro scales, precipitation and soil nutrient factors (i.e., soil nitrogen and phosphorus content) are positively correlated with BGBP or R/S, while temperature and functional traits are negatively correlated. Climate factors contribute more to driving plant biomass allocation strategies than soil and functional trait factors. Climate factors determine BGBP by changing other functional traits of plants. However, climate factors influence R/S mainly by affecting the availability of soil nutrients. The results quantify the productivity and carbon sequestration capacity of terrestrial ecosystems and provide important theoretical guidance for the management of forests, shrubs, and herbaceous plants.
生物量分配反映了植物的资源利用策略，并受到气候因素的显著影响。然而，气候因素如何在宏观尺度上影响地上和地下生物量分配模式仍不清楚。为了解决这个问题，利用中国294个地点486个物种的地上和地下生物量数据进行了一项研究，调查气候变化对生物量分配模式的影响。结果表明，中国西北地区地下生物量在总生物量中的比例（BGBP）或根冠比（R/S）显著高于东南地区。不同类型植物（乔木、灌木和草本植物）的BGBP或R/S存在显著差异（<0.05），草本植物的值显著高于灌木和乔木物种。在宏观尺度上，降水和土壤养分因素（即土壤氮磷含量）与BGBP或R/S呈正相关，而温度和功能性状呈负相关。气候因素比土壤和功能性状因素对驱动植物生物量分配策略的贡献更大。气候因素通过改变植物的其他功能性状来决定BGBP。然而，气候因素主要通过影响土壤养分的有效性来影响R/S。研究结果量化了陆地生态系统的生产力和碳固存能力，为森林、灌木和草本植物的管理提供了重要的理论指导。
