Persistence of four dominant psammophyte species in central Inner Mongolia of China under continual drought
YuanRun ZHENG1*, LianHe JIANG2, Yong GAO3, Xi CHEN4, GePing LUO4, XianWei FENG4, YunJiang YU5, Ping AN6, Yi YU7, Hideyuki SHIMIZU7
1 Key Laboratory of Resource Plants, Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
2 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
3 Inner Mongolia Agricultural University, Hohhot 010018, China;
4 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
5 Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
6 Arid Land Research Center, Tottori University 1390 Hamasaka, Tottori 680-0001, Japan;
7 National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Persistence of four dominant psammophyte species in central Inner Mongolia of China under continual drought
YuanRun ZHENG1*, LianHe JIANG2, Yong GAO3, Xi CHEN4, GePing LUO4, XianWei FENG4, YunJiang YU5, Ping AN6, Yi YU7, Hideyuki SHIMIZU7
1 Key Laboratory of Resource Plants, Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
2 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
3 Inner Mongolia Agricultural University, Hohhot 010018, China;
4 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
5 Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
6 Arid Land Research Center, Tottori University 1390 Hamasaka, Tottori 680-0001, Japan;
7 National Institute for Environmental Studies, Tsukuba 305-8506, Japan
摘要 Clarifying the persistence time of seedlings of dominant species under continual drought will help us understand responses of ecosystems to global climate change and improve revegetation efforts. Drought tolerance of four dominant psammophytic shrub species occurring in different environments was studied in the semi-arid areas of Inner Mongolian grasslands. Seedlings of Hedysarum laeve, Caragana korshinskii, Artemisia sphaerocephala and Artemisia ordosica were grown under four air temperature regimes (night/day: 12.5/22.5°C, 15/25°C, 17.5/27.5°C and 20/30°C) within climate (air temperature and humidity) controlled, naturally lit glasshouses with a night/day relative humidity of 70%/50%. Pots were watered to field capacity for each temperature treatment. Soil water condition was monitored by weighting each pot every day using an electronic balance. Date of seedling death for each treatment was recorded and the dead plants were harvested. Plant dry weights were determined after oven drying at 80°C for 3 days. Two Artemisia species had higher growth rates than H. laeve and C. korshinskii, and the growth of all four species increased with increasing temperatures. The two Artemisia species had the highest leaf biomass increment, followed by C. korshinskii, and then H. laeve. Shoot biomass increment was higher for A. ordosica and C. korshinskii, intermediate for A. sphaerocephala and lowest for H. laeve. C. korshinskii had the highest root biomass increment. The final soil water content at death for all four species varied from 1% to 2%. C. korshinskii, A. sphaerocephala, H. laeve and A. ordosica survived for 25–43, 24–41, 26–41, and 24–37 days without watering, respectively. C. korshinskii, A. sphaerocephala, H. Laeve, and A. ordosica seedlings survived longer at the lowest temperatures (12.5/22.5°C) than at the highest temperatures (20/30°C) by 18, 17, 15 and 13 days, respectively. Increased climatic temperatures induce the death of seedlings in years with long intervals between rainfall events. The adaptation of seedlings to droughts should be emphasized in revegetation efforts in the Ordos Plateau, Inner Mongolia.
Abstract: Clarifying the persistence time of seedlings of dominant species under continual drought will help us understand responses of ecosystems to global climate change and improve revegetation efforts. Drought tolerance of four dominant psammophytic shrub species occurring in different environments was studied in the semi-arid areas of Inner Mongolian grasslands. Seedlings of Hedysarum laeve, Caragana korshinskii, Artemisia sphaerocephala and Artemisia ordosica were grown under four air temperature regimes (night/day: 12.5/22.5°C, 15/25°C, 17.5/27.5°C and 20/30°C) within climate (air temperature and humidity) controlled, naturally lit glasshouses with a night/day relative humidity of 70%/50%. Pots were watered to field capacity for each temperature treatment. Soil water condition was monitored by weighting each pot every day using an electronic balance. Date of seedling death for each treatment was recorded and the dead plants were harvested. Plant dry weights were determined after oven drying at 80°C for 3 days. Two Artemisia species had higher growth rates than H. laeve and C. korshinskii, and the growth of all four species increased with increasing temperatures. The two Artemisia species had the highest leaf biomass increment, followed by C. korshinskii, and then H. laeve. Shoot biomass increment was higher for A. ordosica and C. korshinskii, intermediate for A. sphaerocephala and lowest for H. laeve. C. korshinskii had the highest root biomass increment. The final soil water content at death for all four species varied from 1% to 2%. C. korshinskii, A. sphaerocephala, H. laeve and A. ordosica survived for 25–43, 24–41, 26–41, and 24–37 days without watering, respectively. C. korshinskii, A. sphaerocephala, H. Laeve, and A. ordosica seedlings survived longer at the lowest temperatures (12.5/22.5°C) than at the highest temperatures (20/30°C) by 18, 17, 15 and 13 days, respectively. Increased climatic temperatures induce the death of seedlings in years with long intervals between rainfall events. The adaptation of seedlings to droughts should be emphasized in revegetation efforts in the Ordos Plateau, Inner Mongolia.
This work was supported by the National Basic Research Pro-gram of China (2009CB825103).
通讯作者:
YuanRun ZHENG
E-mail: zhengyr@ibcas.ac.cn
引用本文:
YuanRun ZHENG, LianHe JIANG, Yong GAO, Xi CHEN, GePing LUO, XianWei FENG, YunJia. Persistence of four dominant psammophyte species in central Inner Mongolia of China under continual drought[J]. 干旱区科学, 2013, 5(3): 331-339.
YuanRun ZHENG, LianHe JIANG, Yong GAO, Xi CHEN, GePing LUO, XianWei FENG, YunJiang YU, Ping AN, Yi YU, Hideyuki SHIMIZU. Persistence of four dominant psammophyte species in central Inner Mongolia of China under continual drought. Journal of Arid Land, 2013, 5(3): 331-339.
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