Wang Yanji, Shen Xiangjin, Tong Shouzheng, Zhang Mingye, Jiang Ming, Lu Xianguo
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.
University of Chinese Academy of Sciences, Beijing, China.
Front Plant Sci. 2022 Jun 17;13:941689. doi: 10.3389/fpls.2022.941689. eCollection 2022.
Understanding the spatiotemporal dynamics of aboveground biomass (AGB) is crucial for investigating the wetland ecosystem carbon cycle. In this paper, we explored the spatiotemporal change of aboveground biomass and its response to climate change in a marsh wetland of western Songen Plain by using field measured AGB data and vegetation index derived from MODIS datasets. The results showed that the AGB could be established by the power function between measured AGB density and the annual maximum NDVI (NDVI) of marsh: Y = 302.06 × NDVI . The averaged AGB of marshes showed a significant increase of 2.04 g⋅C/m/a, with an average AGB value of about 111.01 g⋅C/m over the entire western Songnen Plain. For the influence of precipitation and temperature, we found that the annual mean temperature had a smaller effect on the distribution of marsh AGB than that of the total precipitation in the western Songnen Plain. Increased precipitation in summer and autumn would increase AGB by promoting marshes' vegetation growth. In addition, we found that the minimum temperature (T) and maximum temperatures (T) have an asymmetric effect on marsh AGB on the western Songnen Plain: warming T has a significant impact on AGB of marsh vegetation, while warming at night can non-significantly increase the AGB of marsh wetland. This research is expected to provide theoretical guidance for the restoration, protection, and adaptive management of wetland vegetation in the western Songnen Plain.
了解地上生物量(AGB)的时空动态对于研究湿地生态系统碳循环至关重要。本文利用实测的AGB数据和来自MODIS数据集的植被指数,探讨了松嫩平原西部沼泽湿地地上生物量的时空变化及其对气候变化的响应。结果表明,沼泽实测AGB密度与年最大归一化植被指数(NDVI)之间可通过幂函数建立AGB模型:Y = 302.06×NDVI 。松嫩平原西部沼泽的平均AGB显著增加,增幅为2.04 g⋅C/m²/a,整个松嫩平原西部的平均AGB值约为111.01 g⋅C/m²。对于降水和温度的影响,我们发现年平均温度对松嫩平原西部沼泽AGB分布的影响小于总降水量。夏秋季节降水量增加会通过促进沼泽植被生长而增加AGB。此外,我们发现最低温度(Tmin)和最高温度(Tmax)对松嫩平原西部沼泽AGB有不对称影响:Tmax升高对沼泽植被AGB有显著影响,而夜间升温对沼泽湿地AGB的增加影响不显著。本研究有望为松嫩平原西部湿地植被的恢复、保护和适应性管理提供理论指导。