THE IMPACT OF LOW TEMPERATURE ON SEED GERMINATION OF TWO DESERT SPECIES IN JUNGGAR BASIN OF CHINA
THE IMPACT OF LOW TEMPERATURE ON SEED GERMINATION OF TWO DESERT SPECIES IN JUNGGAR BASIN OF CHINA
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DOI：
10.15666/aeer/1605_57715780
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发表时间：
2018
影响因子：
0.7
通讯作者：
M. Peng;M. Wang;P. Jiang;Y. L. Chang;G. Chu
中科院分区：
文献类型：
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作者：
M. Peng;M. Wang;P. Jiang;Y. L. Chang;G. Chu
种子萌发行为对干旱半干旱地区的苗木更新和种群的可持续发展起着重要作用。本研究旨在探讨中国准噶尔盆地低温条件下刺参和梭梭的萌发特征及其生态意义。我们将Logistic函数和热时间方程结合起来，用非线性回归估计了两种植物萌发的基温和热时间。在6个温度梯度(20/15°C、15/10°C、10/5°C、5/2°C、2°C和2/3°C)的光照培养箱中进行了15d的萌发试验。两种植物的最终发芽率在不同温度处理下差异不大，均在90%以上，低温只是抑制了发芽速度。此外，在低温条件下，两种植物的发芽率在第8天都超过了50%。枯草芽孢杆菌的基础温度和加热时间分别为0.54℃和9.89℃，梭梭为0.79℃和7.26℃。结果表明，两种荒漠植物均适应低温生境，并利用湿润的土壤条件在融雪期生长。
Germination behaviour plays an important role for seedling regeneration and the sustainable development of population in arid and semiarid areas. The objectives of the study were to explore germination characteristics of Anabasis aphylla and Haloxylon ammodendron under low temperature conditions and their ecological significance in Junggar basin of China. We combined the Logistic function and the thermal time equation, and used non-linear regression to estimate the base temperature and the thermal time for germination of both species. Germination experiments were carried out in the illumination incubators with 6 temperature gradients (20/15 °C, 15/10 °C, 10/5 °C, 5/2 °C, 2 °C and 2/3 °C) for 15 days. Final germination percentages of the two species were not obviously different and were higher than 90% in different temperature treatments, and low temperature only inhibited germination speed. Moreover, germination percentages of the two species surpassed 50% in the eighth day under low temperature conditions. The base temperature and thermal time of A. aphylla was 0.54 °C and 9.89 °C, while H. ammodendron was 0.79 °C and 7.26 °C, respectively. The results showed that the two desert species adapted to the low temperature habitat and took advantage of humid soil conditions to grow in the snow-melting period.