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Water and heat availability are drivers of the aboveground plant carbon accumulation rate in alpine grasslands on the Tibetan Plateau
Global Ecology and Biogeography ( IF 6.4 ) Pub Date : 2019-10-24 , DOI: 10.1111/geb.13006
Jian Sun 1, 2 , Tian‐Cai Zhou 1, 3, 4 , Miao Liu 1 , You‐Chao Chen 5 , Guo‐Hua Liu 2 , Ming Xu 1, 6, 7 , Pei‐Li Shi 1, 3 , Fei Peng 8, 9 , Atsushi Tsunekawa 8 , Yu Liu 1 , Xiao‐Dan Wang 10 , Shi‐Kui Dong 11 , Yang‐Jian Zhang 1 , Ying‐Nian Li 12
Affiliation  

Aim Climate change is expected to have important effects on plant phenology and carbon storage, with further shifts predicted in the future. Therefore, we proposed the community carbon accumulation rate (CAR) from the start of the growing season (SOS) to the peak of the growing season (POS) to fill the gap that the dynamic interactions between plant phenology and plant carbon research. Location Tibetan Plateau. Major taxa Alpine grassland plants. Time period 2015. Methods We conducted a transect survey across grasslands to measure community aboveground net primary production and carbon concentration. Additionally, phenology indicator data (SOS and POS) were extracted from the Global Inventory Modeling and Mapping Studies (GIMMS) normalized difference vegetation index version 3 database. Next, we used 'changepoint' analysis to detect the patterns of CARs, and performed linear regression and one-way ANOVA to explore the variability of CARs in response to the environmental factors. Ultimately, the total effects of environmental factors on CARs were illustrated by a structural equation model. Results Our results indicated that three CAR patterns were detected, which are low-CAR (0.15 g/m(2)/day), medium-CAR (0.31 g/m(2)/day) and high-CAR (0.84 g/m(2)/day) patterns. We found that the availabilities of water and heat mediated CARs by regulating soil nutrition variability, and that drought climate and insufficient soil resources co-constrained the community CAR at long time-scales. In contrast, high CAR could be explained by more water and heat availability via either direct or indirect effects on soil moisture and soil nutrients. Main conclusions Our findings highlight that water and heat availability are critical driving factors in ecological carbon accumulation processes undergoing climate change. Meanwhile, the vegetative phenology also has important effect on carbon accumulation. Consequently, we propose incorporating the dynamic interactions between plant phenology and plant carbon into the ecological carbon cycle model to improve our understanding of resource utilization and survival strategies of plants under environmental change.

中文翻译:

水和热的可用性是青藏高原高寒草地地上植物碳积累率的驱动因素

目标 气候变化预计将对植物物候学和碳储存产生重要影响,预计未来会发生进一步变化。因此,我们提出了从生长季开始(SOS)到生长季高峰期(POS)的群落碳积累率(CAR),以填补植物物候学与植物碳动态相互作用研究的空白。地点青藏高原。主要分类群 高山草原植物。时间段 2015 年。方法我们对草原进行了样带调查,以测量社区地上净初级生产和碳浓度。此外,物候指标数据(SOS 和 POS)是从全球清单建模和制图研究 (GIMMS) 归一化差异植被指数第 3 版数据库中提取的。接下来,我们使用了'changepoint' 分析以检测 CAR 的模式,并进行线性回归和单向方差分析以探索 CAR 响应环境因素的可变性。最终,环境因素对 CAR 的总影响由结构方程模型说明。结果 我们的结果表明检测到三种 CAR 模式,即低 CAR(0.15 g/m(2)/天)、中 CAR(0.31 g/m(2)/天)和高 CAR(0.84 g/m(2)/天)。 m(2)/天) 模式。我们发现,水和热的可用性通过调节土壤营养变异来介导 CAR,而干旱气候和土壤资源不足在很长一段时间内共同约束了社区 CAR。相比之下,高 CAR 可以通过对土壤水分和土壤养分的直接或间接影响来解释更多的水和热量可用性。主要结论 我们的研究结果强调,水和热的可用性是经历气候变化的生态碳积累过程的关键驱动因素。同时,植物物候对碳积累也有重要影响。因此,我们建议将植物物候学和植物碳之间的动态相互作用纳入生态碳循环模型,以提高我们对环境变化下植物资源利用和生存策略的理解。
更新日期:2019-10-24
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