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Chinese Journal of Plant Ecology >
Responses of seed germination of Leymus chinensis to environmental factors in degraded grassland on Songnen Plain in China
Received date: 2012-02-08
Accepted date: 2012-03-22
Online published: 2012-08-21
Aims Our objective is to study the seed germination of Leymus chinensis in response to critical environmental factors, including temperature, water content and drought stress, type of soils and the saline-alkali stress, in order to explain the mechanisms of degradation of L. chinensis grassland on Songnen Plain in China.
Methods We investigated seed germination of L. chinensis under four temperature regimes (two constant 28 °C and 35 °C and three fluctuating 5/28 °C, 5/35 °C and 16/28 °C), 2.5%-40.0% water content and 0-30% polyethylene glycol 6000 (PEG) solution simulating drought stresses, two types of soils (saline-alkali and non-saline-alkali) and two kinds of salts (NaCl with concentrations from 0 to 500 mmol∙L-1 and Na2CO3 from 0 to 100 mmol∙L-1).
Important findings Fluctuating temperature is a necessary condition for high seed germination of L. chinensis. One of the reasons for grassland degradation in this area is the degraded soil environment where seeds of L. chinensis could not regenerate.
Key words： dormancy; environmental factor; germination; Leymus chinensis; saline-alkali
MA Hong-Yuan, LÜ Bing-Sheng, YANG Hao-Yu, YAN Chao, LIANG Zheng-Wei . Responses of seed germination of Leymus chinensis to environmental factors in degraded grassland on Songnen Plain in China[J]. Chinese Journal of Plant Ecology, 2012 , 36(8) : 812 -818 . DOI: 10.3724/SP.J.1258.2012.00812
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