Differential response of alpine steppe and alpine meadow to climate warming in the central Qinghai-Tibetan Plateau

被引：185

作者：

Ganjurjav, Hasbagan ^{[1
,2
]}

Gao, Qingzhu ^{[1
,2
]}

Gornish, Elise S. ^{[3
]}

Schwartz, Mark W. ^{[4
]}

Liang, Yan ^{[1
,2
]}

Cao, Xujuan ^{[1
,2
]}

Zhang, Weina ^{[1
,2
]}

Zhang, Yong ^{[5
]}

Li, Wenhan ^{[1
,2
]}

Wan, Yunfan ^{[1
,2
]}

Li, Yue ^{[1
,2
]}

Danjiu, Luobu ^{[6
]}

Guo, Hongbao ^{[6
]}

Lin, Erda ^{[1
,2
]}

机构：

[1] Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, CAAS 12 South St Zhongguancun, Beijing 100081, Peoples R China

[2] Minist Agr, Key Lab Agroenvironm & Climate Change, Beijing 100081, Peoples R China

[3] Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA

[4] Univ Calif Davis, Inst Environm, Davis, CA 95616 USA

[5] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China

[6] Nagqu Agr & Anim Husb Bur, Nagqu 852100, Tibet Autonomou, Peoples R China

来源：

AGRICULTURAL AND FOREST METEOROLOGY | 2016年 / 223卷

基金：

中国国家自然科学基金;

关键词：

Warming; Productivity; Community composition; Species diversity; Alpine grassland; NET PRIMARY PRODUCTION; PLANT COMMUNITY; GRASSLAND ECOSYSTEMS; LEAF TRAITS; SHORT-TERM; IMPACTS; DROUGHT; BIOMASS; PRODUCTIVITY; METAANALYSIS;

D O I：

10.1016/j.agrformet.2016.03.017

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Recently, the Qinghai-Tibetan Plateau has experienced significant warming. Climate warming is expected to have profound effects on plant community productivity and composition, which can drive ecosystem structure and function. To explore effects of warming on plant community productivity and composition, we conducted a warming experiment using open top chambers (OTCs) from 2012 to 2014 in alpine meadow and alpine steppe habitat on the central Qinghai-Tibetan Plateau. We measured above-ground net primary productivity (ANPP), community composition and species diversity under ambient and two levels of artificially warmed conditions across three years. Our results showed that warming significantly stimulated plant growth in the alpine meadow, but reduced growth on the alpine steppe. The increase of ANPP in alpine meadow was a result of an increase of plant height under warming. Warming-induced drought conditions were primarily responsible for the observed decrease of ANPP in an alpine steppe. Plant community composition and species diversity were not influenced by warming in alpine meadow. Alternatively, in alpine steppe, cover of graminoids and forbs significantly declined while legumes substantially increased under warming, subsequently resulting in rapid species losses. Changes in soil moisture were responsible for observed changes in graminoids and legumes in the alpine steppe. Overall, experimental results demonstrated that warming had a positive impact on plant community structure and function in alpine meadow and had a negative impact on these characteristics in an alpine steppe. This work highlights the important role of soil moisture for regulating plant productivity and community composition response to warming in the alpine steppe. In particular, the deep-rooted, drought resistant plants may increase in a warmer future in the central Qinghai-Tibetan Plateau. These changes may reduce habitat quality for the local community of grazers because many of the species that increased are also unpalatable to grazers. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：233 / 240

页数：8

共 37 条

[1] Four years of simulated climate change reduces above-ground productivity and alters functional diversity in a grassland ecosystem [J].