摘要
本研究以海北高寒草甸为研究对象,比较了2、4、9、11、20年5个围栏封育处理与各自配对的放牧样地(对照)的生物量碳储量。结果表明:短期(2和4年)围封对植被碳储量无显著影响(P>0.05),但长期(9、11和20年)围封显著降低了植被碳储量(P<0.05)。围封改变了不同功能群对地上生物量碳储量的相对贡献;短期围封增加了杂类草的地上生物量碳储量,而长期围封显著降低了禾草、豆科和莎草的地上生物量碳储量(P<0.05)。长期围封主要通过降低地下生物量碳储量(根系,0–50 cm土壤深度),进而降低植被碳储量。研究结果显示,长期围封不利于青藏高原高寒草甸植被碳储量的积累,尤其不利于地下根系碳储量的固存。
This study was performed to compare differences in vegetation carbon storage between five fencing treatments(2,4,9,11,and 20 years)and their corresponding grazing treatments(control)in alpine meadows of Haibei.Short-term fencing(2 and 4 years)had no significant effect on vegetation carbon storage(P>0.05),whereas long-term fencing(9,11,and 20 years)significantly reduced vegetation carbon storage(P<0.05).Fencing changed the relative contribution of different functional groups to the above-ground biomass carbon storage.Short-term fencing significantly increased above-ground biomass carbon storage of forbs(P<0.05),whereas long-term fencing significantly reduced above-ground biomass carbon storage of grasses,legumes,and sedges(P<0.05).Long-term fencing decreased carbon vegetation storage mainly by reducing below-ground biomass(root system levels,0–50 cm soil depth).These results suggest that long-term fencing was not conducive to the accumulation of biomass carbon storage in alpine meadows of Haibei on the Qinghai-Tibetan Plateau,especially to the stock of below-ground root carbon storage.
作者
宋珊珊
张建胜
郑天立
张帆
朱剑霄
SONG Shanshan;ZHANG Jiansheng;ZHENG Tianli;ZHANG Fan;ZHU Jianxiao(College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730000,Gansu,China;Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300000,China)
出处
《草业科学》
CAS
CSCD
2020年第12期2414-2421,共8页
Pratacultural Science
基金
重点研发项目“青藏高原退化草地恢复的主要物源制约因子及其应用技术研发(2019YFC0507704)”。
关键词
碳储量
功能群
根系
群落结构
青藏高原
carbon storage
functional groups
root system
community structure
Qinghai-Tibetan Plateau
作者简介
第一作者:宋珊珊(1996-),女,河南新乡人,在读硕士生,主要从事草地生物多样性与碳循环研究。E-mail:songshsh18@lzu.edu.cn;通信作者:朱剑霄(1986-),男,四川成都人,青年研究员,博士,主要从事陆地生态系统碳循环方面研究。E-mail:jxzhu@lzu.edu.cn。
