[1]李 阳,王根绪,芮鹏飞,等.裸斑对青藏高原多年冻土区高寒草甸生态系统呼吸和甲烷吸收的影响[J].山地学报,2020,(2):190-200.[doi:10.16089/j.cnki.1008-2786.000501]
　LI Yang,WANG Genxu,RUI Pengfei,et al.Effects of Bare Patches on Ecosystem Respiration and Methane Uptake of Alpine Meadow in a Permafrost Region of the Qinghai-Tibet Plateau[J].Mountain Research,2020,(2):190-200.[doi:10.16089/j.cnki.1008-2786.000501]
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裸斑对青藏高原多年冻土区高寒草甸生态系统呼吸和甲烷吸收的影响()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年第2期
页码:
190-200
栏目:
山地环境
出版日期:
2020-05-10

文章信息/Info

Title:
Effects of Bare Patches on Ecosystem Respiration and Methane Uptake of Alpine Meadow in a Permafrost Region of the Qinghai-Tibet Plateau
文章编号:
1008-2786-(2020)2-190-11
作者:
李 阳1; 2; 王根绪1; 芮鹏飞3; 杨 祎 1; 2; 常瑞英1*
1.中国科学院、水利部成都山地灾害与环境研究所 山地表生过程与调控重点实验室,成都610041; 2.中国科学院大学,北京100049; 3.青藏高原北麓河冻土工程与环境综合观测研究站,兰州,730000
Author(s):
LI Yang1; 2;  WANG Genxu1;  RUI Pengfei3;  YANG Yi1; 2;  CHANG Ruiying1*
1. Key Laboratory of Mountain Surface Processes and Ecological Regulation,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Beiluhe Observation and Research Station on Frozen Soil Engineering and Environment in Qinghai-Tibet Plateau, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
关键词:
碳交换;  地形;  土壤湿度;  方差分解法;  青藏高原
Keywords:
carbon exchange;  terrain;  soil moisture;  variation partitioning analysis;  the Qinghai - Tibet Plateau
分类号:
Q948
DOI:
10.16089/j.cnki.1008-2786.000501
文献标志码:
A
摘要:
研究裸斑对青藏高原多年冻土区高寒草甸生态系统呼吸和甲烷通量的影响,对准确评估多年冻土区小流域和区域尺度碳交换具有重要意义。本文以青藏高原风火山高寒草甸中裸斑和高植被覆盖斑块为研究对象,通过对比不同地形条件下(不同坡向和海拔)二者生态系统呼吸和甲烷通量的差异来研究裸斑对高寒草甸生态系统呼吸和甲烷通量的影响。结果表明:(1)裸斑显著减少了高寒草甸的生态系统呼吸,裸斑和高植被覆盖斑块生长季生态系统呼吸的平均速率分别为2.26和6.17 g CO2 m-2 d-1,这主要是二者微生物量碳和蔗糖酶活性差异造成的;(2)裸斑和高植被覆盖斑块在生长季内均表现为甲烷的汇,二者生长季甲烷吸收的平均速率分别为25.4和6.61 μg CH4 m-2 h-1; 在坡中和坡顶,裸斑的甲烷吸收速率显著大于高植被覆盖斑块,而在坡底,二者的甲烷吸收速率相近; 土壤湿度是调控高寒草甸甲烷吸收空间变异的主要因素。研究结果深化了裸斑对青藏高原多年冻土区高寒草甸碳交换影响的认识,可为小流域以及区域尺度碳交换的准确评估提供科学依据。
Abstract:
It is of great significance to study the effects of bare patches on ecosystem respiration(Re)and methane(CH4)flux of alpine meadow in the Qinghai-Tibet Plateau for accurate assessment of small watershed and regional scale carbon exchange. In this paper, the bare patches and high vegetation coverage patches in an alpine meadow on the Mountain Fenghuo were studied, and the effect of bare patches on the Re and CH4 flux in alpine meadow by comparing the difference in Re and CH4 flux between bare patches and high vegetation coverage patches different terrain conditions(different slope aspects and elevations). The results showed that:(1)The bare patches significantly reduced Re in alpine meadow, and the average Re rates of bare patches and high vegetation coverage patches were 2.26 and 6.17 g CO2 m-2 d-1 during the growing seasons, which was mainly caused the difference in their microbial biomass carbon and saccharase activity.(2)During the growing season, both the bare patches and high vegetation coverage patches functioned as CH4 sinks, and the average CH4 uptake rates of two were 25.4 and 6.61 μg m-2 h-1, respectively. The CH4 uptake rate of bare patches was significantly greater than that of high vegetation coverage patches at the middle and upper of the slopes, but their CH4 uptake rate were similar at the bottom of the slopes. Soil moisture was the main factor regulating the spatial variation of CH4 uptake in alpine meadow. These results deepened the understanding of the impact of bare patches on carbon exchange in alpine meadow on the region, and provided scientific basis for accurate assessment of carbon exchange in small watershed and regional scale.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-12-02; 改回日期(Accepted date):2020-03-12
基金项目(Foundation item):国家自然科学基金项目(41671206); 中国科学院青年创新促进会项目(2018406)。[National Natural Science Foundation of China General Program(41671206); Youth Innovation Promotion Association, CAS(2018406)]
作者简介(Biography):李阳(1995-),男,河北邯郸人,硕士研究生,主要研究方向:寒区生态学。[LI Yang(1995-), male, born in Handai, Hebei province, M. Sc. candidate, research on ecology in cold regions] E-mail: LiYang@imde.ac.cn
*通讯作者(Corresponding author):常瑞英(1982-),男,内蒙古兴和人,博士,副研究员,主要研究方向:土壤碳氮循环。[CHANG Ruiying(1982-), male, born in Xinghe, Inner Mongolia, associate professor, research on soil carbon and nitrogen cycle]E-mail: changruiying@imde.ac.cn
更新日期/Last Update: 2020-03-30