[1]郭小伟,戴黎聪,李以康,等.不同退化程度下的高寒草甸主要温室气体通量[J].水土保持研究,2019,26(05):188-194,209.
　GUO Xiaowei,DAI Licong,LI Yikang,et al.Major Greenhouse Gas Fluxes in Different Degradation Levels of Alpine Meadow on the Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2019,26(05):188-194,209.
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不同退化程度下的高寒草甸主要温室气体通量

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 26 期数: 2019年05期 页码: 188-194,209 栏目: 出版日期: 2019-09-06
Title:
Major Greenhouse Gas Fluxes in Different Degradation Levels of Alpine Meadow on the Qinghai-Tibetan Plateau
作者:
郭小伟1, 戴黎聪1,2, 李以康1, 张法伟1, 林丽1, 李茜1, 钱大文1, 樊博1, 柯浔1,2, 舒铠1,2
1. 青海省寒区恢复生态学重点实验室, 中国科学院 西北高原生物研究所, 西宁 810001;
2. 中国科学院大学, 北京 100039
Author(s):
GUO Xiaowei1, DAI Licong1,2, LI Yikang1, ZHANG Fawei1, LIN Li1, LI Qian1, QIAN Dawen1, FAN Bo1, KE Xun1,2, SHU Kai1,2
1. Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;
2. College of Resources and Environment, University of the Chinese Academy of Sciences, Beijing 100039, China
关键词:
草地生态; 高寒草甸; 草地退化; 温室气体; 环境因子
Keywords:
Tibetan Plateau; alpine meadows; greenhouse gas; environmental factor
分类号:
S812
摘要:
青藏高原高寒草甸对于气候变化和人类活动敏感而脆弱，以高寒草甸4个退化阶段：原生草甸（NM）、轻度退化草甸（LM）、中度退化草甸（MM）和重度退化草甸（HM）为研究对象，利用静态箱法研究了草甸退化对于草地主要温室气体通量的影响。结果表明：不同放牧强度对于草地温室气体通量影响显著，重度退化草甸相比原生草甸CH4吸收显著增加（p<0.05），CO2排放能力逐渐降低，N2O排放能力显著增强（p<0.05），放牧活动对于高寒草甸的影响首先表现在植被上，而土壤环境的变化相比植被更加迟滞，因此退化年限对于草地温室气体通量至关重要。通过逐步回归分析得知，草甸甲烷通量主要影响因子为土壤紧实度、有机质、植被盖度；二氧化碳通量主要影响因子为全磷、植被盖度、全氮；氧化亚氮通量主要影响因子为有机质、紧实度、死根，高寒草甸退化演替发展到重度退化阶段时释放大量温室气体。
Abstract:
Qinghai-Tibet Plateau is sensitive and fragile to climate change and human activities. This study took four degradation stages of alpine meadow as the research site, i. e. natibe alpine meadow (NM), lightly degraded meadow (LM), moderately degraded meadow (MM) and heavily degraded meadow (HM). Greenhouse gas fluxes were measured using static chambers and gas chromatography. The results indicate that grassland greenhouse gas fluxes are significant different (p<0.05). The CH4 absorption of HM significantly increases compared with that of NM, with the aggravation of grassland degradation, CO2 flux decreases and N2O flux increases. Grazing first affects the vegetation part of the alpine meadow, soil environment changes are much later than vegetation. The stepwise regression analysis shows that the main influencing factors of methane flux in meadow are soil compactness, organic matter and vegetation coverage, the main influencing factors of carbon dioxide flux are total phosphorus, vegetation coverage and total nitrogen, the main influencing factors of nitrous oxide flux were organic matter, compactness and dead root biomass. When alpine meadow degradation succession develops in the stage of severe degradation, a large amount of greenhouse gases emit.

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备注/Memo

收稿日期:2018-12-18;改回日期:2018-12-29。
基金项目:国家自然科学基金重点项目（41730752）；国家自然科学基金青年项目（31700395）；青海省自然科学基金青年项目（2016-ZJ-918Q）
作者简介:郭小伟(1985-),男,山东潍坊人,博士,高级工程师,主要从事植物生态学研究。E-mail:xwguo1206@163.com
通讯作者:杜岩功(1981-)男,山东威海人,博士,副研究员,主要从事草地生态学研究。E-mail:ygdu@nwipb.cas.cn

更新日期/Last Update: 1900-01-01