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| 青藏高原高寒草地地上植物碳积累速率对生态系统多功能性的影响机制 | |
| 引用本文： | 孙建,王毅,刘国华. 青藏高原高寒草地地上植物碳积累速率对生态系统多功能性的影响机制[J]. 植物生态学报, 2021, 45(5): 496-506. DOI: 10.17521/cjpe.2020.0180 |
| 作者姓名： | 孙建 王毅 刘国华 |
| 作者单位： | 中国科学院地理科学与资源研究所生态网络观测与模拟重点实验室, 北京 100101 成都理工大学地球科学学院, 成都 610059 中国科学院生态环境研究中心城市与区域生态学国家重点实验室, 北京 100085 |
| 基金项目： | 第二次青藏高原综合科学考察研究项目(2019QZKK0405) |
| 摘 要： | 在全球气候变暖的背景下, 草地作为陆地生态系统碳库的重要组成部分, 其较小幅度的波动, 会影响整个陆地生态系统碳循环和生态系统多功能性(EMF)。地上植物碳积累速率(CAR)表示从生长季初始到生长季生物量峰值的群落地上部分碳累积速率, 能够很好地表征固碳功能、固碳潜力和效率。因此, 植物CAR的变化会改变地上和地下群落维持EMF的能力。目前EMF的相关报道多探讨地上群落多样性和EMF的关系, 而缺乏高寒草地生态系统植被地上CAR对EMF的影响机制研究。该研究目的是探究高寒草地群落CAR对EMF的调控作用、机理和过程, 这将对草地生态系统管理提供理论支持, 并推进对生态系统多功能性维持机制的理解。2015年7-8月, 在青藏高原地区进行草地样带调查, 共计取115个样点。综合土壤有机碳、全氮、全磷、地上和地下生物量以及微生物生物量碳等13种生态系统参数计算生态系统多功能性指数(M)。利用归一化植被指数(NDVI, 1982-2013年)计算并提取2015年物候数据, 最终获得CAR。采用薄盘光滑样条插值法插值气象数据, 提取样点2011-2015年年降水量和年平均气温, 以供分析CAR对EMF的调控机理。主要结果: 地下生物量、土壤有机碳、全磷和微生物生物量碳含量对CAR和M有较高的权重(0.58、0.80、0.83和0.79; 1.05、0.98、1.02和0.97), CAR和M呈显著线性正相关关系(R2 = 0.45, p < 0.01)。在降水和气温要素的影响下, 植物地上群落和地下土壤要素的协同作用, 影响植被CAR, 进一步调控EMF。 |
| 关 键 词： | 生态系统多功能性 碳积累速率 高寒草地 土壤有机碳 青藏高原 |
| 收稿时间： | 2020-06-05 |
Linkages of aboveground plant carbon accumulation rate with ecosystem multifunctionality in alpine grassland,Qingzang Plateau |
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| SUN Jian,WANG Yi,LIU Guo-Hua. Linkages of aboveground plant carbon accumulation rate with ecosystem multifunctionality in alpine grassland,Qingzang Plateau[J]. Acta Phytoecologica Sinica, 2021, 45(5): 496-506. DOI: 10.17521/cjpe.2020.0180 | |
| Authors: | SUN Jian WANG Yi LIU Guo-Hua |
| Affiliation: | Key Laboratory of Observation and Simulation of Ecological Networks, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China |
| Abstract: | Aims As one of the major terrestrial ecosystems of the world, a small fluctuation of grassland soil carbon (C) would affect the carbon cycle of the terrestrial ecosystem and ecosystem multifunctionlity (EMF). The carbon accumulation rate (CAR) of aboveground community well reflects the capacity and efficiency of carbon sequestration in a field from the start to the peak of a growing season. The changes in plant CAR could influence the ability of above- and below-ground community. Currently, the majority of studies have primarily focused on the relationship between community diversity and EMF, while the linkages of CAR with EMF were understudied. We aimed to explore the process and underlying mechanism of how CAR affecting EMF in alpine grassland community. Our results would improve the understanding of EMF maintenance mechanism and provide theoretical support for alpine ecosystem management.Methods We conducted a field transect survey which consists of a total of 115 sample sites of alpine grasslands on the Qingzang Plateau from July to August 2015. The ecosystem multifunctionality index (M) was calculated from 13 key ecosystem parameters including soil organic carbon content, total nitrogen content, total phosphorus content above- and belowground biomass etc. The normalized difference vegetation index (NDVI, 1982-2013) was adopted to obtain the phenology in 2015. We calculated the CAR value. To explore the underlying mechanism of how CAR affecting EMF, the annual total precipitation and temperature were extracted by the method of thin disk smooth spline interpolation based on observations of meteorological stations from 2011-2015.Important findings Belowground biomass, soil organic carbon content, total phosphorus content and microbial biomass carbon content had high weighting for CAR (0.58, 0.80, 0.83 and 0.79) and M (1.05, 0.98, 1.02 and 0.97). There was a significantly positive correlation between CAR and M (R2 = 0.45, p < 0.01). Our findings suggested that the synergism of plant community and soil elements affected CAR and further regulated EMF under the influences of precipitation and temperature. |
| Keywords: | ecosystem multifunctionlity carbon accumulation rate alpine grassland soil organic carbon Qingzang Plateau |
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