How precipitation and grazing influence the ecological functions of drought-prone grasslands on the northern slopes of the Tianshan Mountains, China?

HUANG Xiaotao ¹LUO Geping ²CHEN Chunbo ²PENG Jian ³ZHANG Chujie ³ZHOU Huakun ⁴YAO Buqing ⁴MA Zhen ⁴XI Xiaoyan⁵

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作者信息

1. Qinghai Provincial Key Laboratory of Restoration Ecology for Cold Regions,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810008,China;Key Laboratory of Adaptation and Evolution of Plateau Biota,Chinese Academy of Sciences,Xining 810008,China;State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China
2. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China
3. Xinjiang Grassland Technical Popularization Station,Urumqi 830049,China
4. Qinghai Provincial Key Laboratory of Restoration Ecology for Cold Regions,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810008,China;Key Laboratory of Adaptation and Evolution of Plateau Biota,Chinese Academy of Sciences,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China
5. Qinghai Environmental Sciences Research and Design Institute Co. Ltd.,Xining 810007,China
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Abstract

Drought-prone grasslands provide a critical resource for the millions of people who are dependent on livestock for food security. However, this ecosystem is potentially vulnerable to climate change (e.g., precipitation) and human activity (e.g., grazing). Despite this, the influences of precipitation and grazing on ecological functions of drought-prone grasslands in the Tianshan Mountains remain relatively unexplored. Therefore, we conducted a systematic field investigation and a clipping experiment (simulating different intensities of grazing) in a drought-prone grassland on the northern slopes of the Tianshan Mountains in China to examine the influences of precipitation and grazing on aboveground biomass (AGB), soil volumetric water content (SVWC), and precipitation use efficiency (PUE) during the period of 2014–2017. We obtained the meteorological and SVWC data using an HL20 Bowen ratio system and a PR2 soil profile hydrometer, respectively. We found that AGB was clearly affected by both the amount and seasonal pattern of precipitation, and that PUE may be relatively low in years with either low or excessive precipitation. The PUE values were generally higher in the rapid growing season (April–July) than in the entire growing season (April–October). Overall, moderate grazing can promote plant growth under water stress conditions. The SVWC value was higher in the clipped plots than in the unclipped plots in the rapid growing season (April–July), but it was lower in the clipped plots than in the unclipped plots in the slow growing season (August–October). Our findings can enhance the understanding of the ecological effects of precipitation and grazing in drought-prone grasslands and provide data that will support the effective local grassland management.

Key words

climate change/human activity/aboveground biomass/precipitation use efficiency/soil volumetric water content/water stress

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基金项目

This research was funded by the Chinese Academy of Science (CAS) "Light of West China" Program (2018; Title: "The effect of graz(2018-SF-146)

Province Natural Foundation of Qinghai(2017-S-1-04)

Province Natural Foundation of Qinghai(2020-ZJ-925)

Xinjiang Uygur Autonomous Region Grassland Ecological Restoration and Subsidy Monitoring Support Project(XJCYZZ202001)

Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0302)

出版年

2021

干旱区科学

中国科学院新疆生态与地理研究所,科学出版社

干旱区科学

CSTPCDCSCDSCI

影响因子：1.743

ISSN：1674-6767

参考文献量41

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