高寒草甸茎直黄芪物候对模拟季节性不对称增温的响应

doi:10.11733/j.issn.1007-0435.2021.04.008

草地学报 ›› 2021, Vol. 29 ›› Issue (4): 694-700.DOI: 10.11733/j.issn.1007-0435.2021.04.008

高寒草甸茎直黄芪物候对模拟季节性不对称增温的响应

尕藏加¹, 斯确多吉^2,3,4*, 索南吉^5,6, 边巴普赤^2,7, 南吉^2,7, 谢正新¹

1.西藏大学理学院生物系, 西藏拉萨 850000;
2.中国科学院青藏高原研究所高寒生态重点实验室, 西藏拉萨 850000;
3.中国科学院青藏高原地球科学卓越创新中心, 北京 100101;
4.西藏大学-中国科学院青藏高原研究所那曲生态环境综合观测研究站, 西藏那曲 852000;
5.青海师范大学生命科学学院, 青海西宁 810016;
6.高原科学与可持续发展研究院, 青海西宁 810016;
7.中国科学院大学, 北京 100049

收稿日期:2021-03-17 修回日期:2021-04-08 发布日期:2021-06-02
通讯作者: * E-mail:tsechoedorji@itpcas.ac.cn
作者简介:尕藏加(1991-),男,藏族,青海贵德人,硕士研究生,主要从事高寒植物物候生态学,E-mail:Skalsanggyal@outlook.com
基金资助:
第二次青藏高原综合考察研究(2019QZKK0608);西藏大学高水平人才培养计划项目(2018-GSP-006);国家自然科学基金委-西藏联合基金重点支持项目(U20A2005)和面上项目(31770524)资助

The Phenological Response of Astragalus strictus to Seasonal Asymmetric Warming in Alpine Meadow Grassland

SKAL Sang-gyal¹,TSECHOE Dor-ji^2,3,4*,SUO Nan-ji^5,6,BIANBA Pu-chi^2,7,NAN Ji^2,7,XIE Zheng-xin¹

1. Faculty of Sciences, Department of Biology, Tibet University, Lhasa, Tibet 850000, China;
2. Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Lhasa, Tibet 850000, China;
3. CAS Center for Excellence in Tibetan Plateau Earth Science, Beijing 100101, China;
4. Nagchu Ecological and Environmental Observation and research Station, Tibet University-Institute of Tibet Plateau Research,Chinese Academy of Sciences, Nagchu, Tibet 852000, China;
5. College of Life Sciences, Qinghai Normal University, Xining, Qinghai Province 810016, China;
6. Institute of Plateau Science and Sustainable Development, Xining, Qinghai Province 810016, China;
7. University of Chinese Academy of Sciences, Beijing 100049,China

Received:2021-03-17 Revised:2021-04-08 Published:2021-06-02
Contact: * E-mail:tsechoedorji@itpcas.ac.cn

摘要/Abstract

摘要： 植物物候是植物为适应其生长环境而呈现的节律性变化,是气候变化的最敏感指示器之一。为了探讨高寒植物对其生长环境水热变化的响应特征和机制,本研究利用开顶式模拟增温装置进行增温,以茎直黄芪(Astragalus strictus Grah. Ex Bunge)为研究对象,探讨其返青、枯黄物候和生长期长度对2016—2019年季节性不对称性增温(全年、生长季增温)的响应特征和机理。研究发现:茎直黄芪的平均返青物候在年际间差异极显著;2019年与其它年份比较显著提前了茎直黄芪的返青物候;增温未影响茎直黄芪返青物候;与对照比较,全年和生长季增温分别延迟了茎直黄芪枯黄期7.7和1.9 d,缩短了其平均生长期长度1.7和14.5 d;在水分充足条件下增温提前植物的返青物候,延长其枯黄物候,导致生长期延长,自然水分条件相对较低时则相反。综上分析,水分条件是该区域植物生长的主要限制因素之一。

关键词: 高寒草甸, 茎直黄芪, 物候, 全年增温, 生长季增温

Abstract: This study was aimed to explore the response of alpine plants to hydrothermal changes and its underlying mechanism. In central Tibet,Nam Tso region between 2016 and 2019,the responses of Astragalus strictus to asymmetric warming (annual warming—ANW and growing season warming—GRW) that simulated by open top chambers (OTCs) were studied. The green-up,senescence,and growing season duration of Astragalus strictus in response to asymmetric warming were analyzed. We found that the mean green-up phenology of Astragalus strictus significantly differed between years. The green-up date in 2019 was significantly advanced compared with other years under all treatment conditions,while the green-up date in 2017 and 2018 was delayed compared to that in 2016 and 2019. On four years’ average,both the ANW and GRW did not significantly affect the green-up,nor did interact with “year” and each other. Based on the data in 2019,the ANW and GRW did not significantly affect senescence or growing season duration of Astragalus strictus,but the average onset time of senescence was delayed 7.7 days on average compared to control. Under the GRW,the onset time of senescence in 2019 was delayed 1.9 days on average compared to control. The average growing season duration of Astragalus strictus was 153 days under the ANW,which was 1.7 days shorter than the control. The average growing season duration under GRW was 140.5 days,which was 14 days shorter than the control one. However,the trend of changes in green-up and senescence under the warming treatments in different years might be related to variation in water availability in natural conditions over the years,where warming caused advancement in green-up,delay in senescence,and lengthened in growing season duration under the warming treatments when water was abundant,while the delayed green-up,advanced senescence,and shortened growing season duration under the warming treatments were caused by the drier soil condition due to warming in the draught years. In conclusion,water availability is one of the most important conditions for plant growth in this region.

Key words: Alpine meadow, Astragalus strictus, Phenology, Annual warming, Growing season warming

中图分类号:

S153

尕藏加, 斯确多吉, 索南吉, 边巴普赤, 南吉, 谢正新. 高寒草甸茎直黄芪物候对模拟季节性不对称增温的响应[J]. 草地学报, 2021, 29(4): 694-700.

SKAL Sang-gyal,TSECHOE Dor-ji,SUO Nan-ji,BIANBA Pu-chi,NAN Ji,XIE Zheng-xin. The Phenological Response of Astragalus strictus to Seasonal Asymmetric Warming in Alpine Meadow Grassland[J]. Acta Agrestia Sinica, 2021, 29(4): 694-700.

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高寒草甸茎直黄芪物候对模拟季节性不对称增温的响应

The Phenological Response of Astragalus strictus to Seasonal Asymmetric Warming in Alpine Meadow Grassland

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