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《Arid Land Geography》 2011-01
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Response to droughty stresses and drought-resistances evaluation of seed germination of four desert vegetation

HE Fang-lan,ZHAO Ming,WANG Ji-he,YU Qiu-shi,ZHANG Jin-chun(Gansu Minqin National Studies Station for Desert Steppe Ecosystem&Gansu Desert Control Research Institute,Wu wei 733000,Gansu,China)  
By the way of simulation drought,the seeds germination and seedling growth of four desert vegetations of Kalidium foliatum,Lycium ruthenicum,Artemisia arenaria and Artemisia ordosica were tested in distilled water appended PEG-6000(solution osmotic potentials were changed from 0 to-2.1 MPa),darkness and 25 ℃ for ten days.The results show that drought stress has a significant effect on seed germination and seedling growth of the four desert vegetations(P0.05),and the lowest thresholds of osmotic potential for seed germination are-1.5 MPa in Kalidium foliatum and-0.9 MPa in Lycium ruthenicum,Artemisia arenaria and Artemisia ordosica.With the aggravating of drought stress,the total germination rates,plumule lengths,radical lengths,seedling fresh weights and vigor indexes of four desert vegetations are tended to decline,which are smaller than that of the comparison ones.The comprehensive evaluation of the relative seed germination rates,relative germination days,relative plumule lengths,relative radical lengths,relative seedling fresh weights,drought resistance indexes and relative vigor indexes of four vegetations by the average subordinative function method indicates that the drought resistances of the four vegetations are decreased in the order of Kalidium foliatumArtemisia arenariaArtemisia ordosica Lycium ruthenicum.Basing on the studies and reported literature,it found that the extent of seed germination drought-resistance of desert vegetation in the condition of simulation drought could not exactly reveal tolerance-drought capability of their seed germination in the nature.And the adaptability of desert vegetations to drought not only depends on capability of drought-resistance,but also their drought-resistance mechanism.On the results and four vegetation habitats,the paper brought forward suggestions as follows: the capability and mechanism of drought-resistances of seed germination and seedling and transplant survival rates of species distributed in desert region should been studied together.Among the four vegetation,Kalidium foliatum is more suited to restore heavy salinization areas,and Artemisia arenaria is more fitted to restore serious sandy areas.
【Fund】: 国家“十一五”科技支撑计划项目(2007BAD46B00);; 甘肃省重大科技专项(0702NKDH030);; 中央级公益性科研院所基本科研业务专项资金项目(CAFYBB2007043)
【CateGory Index】: Q948.12
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