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Journal of Arid Land
Journal of Arid Land  2019, Vol. 11 Issue (6): 824-836    DOI: 10.1007/s40333-019-0127-1
Orginal Article     
Responses in gross primary production of Stipa krylovii and Allium polyrhizum to a temporal rainfall in a temperate grassland of Inner Mongolia, China
HU Xiaoxing1, Mitsuru HIROTA2, Wuyunna3, Kiyokazu KAWADA2, LI Hao1, MENG Shikang1, Kenji TAMURA2, Takashi KAMIJO1,*()
1 Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan
2 Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan
3 College of Environment and Resources, Dalian Minzu University, Dalian 116600, China
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Abstract  

In the arid and semi-arid areas of China, rainfall and drought affect the growth and photosynthetic activities of plants. Gross primary productivity (GPP) is one of the most important indices that measure the photosynthetic ability of plants. This paper focused on the GPP of two representative grassland species (Stipa krylovii Roshev. and Allium polyrhizum Turcz. ex Regel) to demonstrate the effect of a temporal rainfall on the two species. Our research was conducted in a temperate grassland in New Barag Right Banner, Hulun Buir City, Inner Mongolia Autonomous Region of China, in a dry year 2015. We measured net ecosystem productivity (NEP) and ecosystem respiration flux (ER) using a transparent chamber system and monitored the photosynthetically active radiation (PAR), air and soil temperature and humidity simultaneously. Based on the measured values of NEP and ER, we calculated the GPP of the two species before and after the rainfall. The saturated GPP per aboveground biomass (GPPAGB) of A. polyrhizum remarkably increased from 0.033 (±0.018) to 0.185 (±0.055) μmol CO2/(gdw?s) by 5.6-fold and that of S. krylovii decreased from 0.068 (±0.021) to 0.034 (±0.011) μmol CO2/(gdw?s) by 0.5-fold on the 1st and 2nd d after a 9.1 mm rainfall event compared to the values before the rainfall at low temperatures below 35°C. However, on the 1st and 2nd d after the rainfall, both of the saturated GPPAGB values of S. krylovii and A. polyrhizum were significantly lower at high temperatures above 35°C (0.018 (±0.007) and 0.110 (±0.061) μmol CO2/(gdw?s), respectively) than at low temperatures below 35°C (0.034 (±0.011) and 0.185 (±0.055) μmol CO2/(gdw?s), respectively). The results showed that the GPP responses to the temporal rainfall differed between S. krylovii and A. polyrhizum and strongly negative influenced by temperature. The temporal rainfall seems to be more effective on the GPP of A. polyrhizum than S. krylovii. These differences might be related to the different physiological and structural features, the coexistence of the species and their species-specific survival strategies.

Key words： temperate grassland      gross primary productivity      temporal rainfall      survival strategy      dry year      drought     
Received: 22 May 2018      Published: 10 December 2019
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Xiaoxing HU
HIROTA Mitsuru
Wuyunna
KAWADA Kiyokazu
Hao LI
Shikang MENG
TAMURA Kenji
KAMIJO Takashi
Cite this article:

HU Xiaoxing, Mitsuru HIROTA, Wuyunna, Kiyokazu KAWADA, LI Hao, MENG Shikang, Kenji TAMURA, Takashi KAMIJO. Responses in gross primary production of Stipa krylovii and Allium polyrhizum to a temporal rainfall in a temperate grassland of Inner Mongolia, China. Journal of Arid Land, 2019, 11(6): 824-836.

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http://jal.xjegi.com/10.1007/s40333-019-0127-1     OR     http://jal.xjegi.com/Y2019/V11/I6/824

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