干旱区生态环境知识资源中心(Arid): 环境因子对蒙古莸种子萌发及幼苗建成的影响

Arid

	环境因子对蒙古莸种子萌发及幼苗建成的影响
其他题名	Effects of environmental factors on seed germination and seedling establishment of Caryopteris mongolica
	贺一鸣 1; 李青丰 1; 贺晓 1; 樊如月 1; 段茹晖 1; 刘洋 2
来源期刊	生态学报
ISSN	1000-0933
出版年	2018
卷号	38 期号:13 页码:4724-4732
中文摘要	蒙古莸(Caryopteris mongolica)是珍稀濒危的资源性植物,具较高的观赏和药用价值。其分布范围正日渐缩小。通过对内蒙古中西部干旱草原区蒙古莸天然种群实生苗的调查,以及在室内模拟不同环境条件,对蒙古莸种子萌发和幼苗建成进行研究,旨在探究这一物种珍稀、濒危的原因。结果显示: 1)自然条件下蒙古莸种子在57月大量萌发,但在幼苗生长初期死亡率较高,使得自然种群更新强度仅为0.11株/m~2。2)蒙古莸种子不存在休眠现象,成熟采收后很快即可萌发。萌发对水分要求较宽范,但适宜其种子萌发的温度范围较窄,为2530℃。3)蒙古莸幼苗生长的最适温度为25℃,能耐受每日短暂的高温胁迫(50℃)。持续的高温、低温和频繁的降水显著增大幼苗死亡率。研究认为,蒙古莸种子萌发的条件与幼苗存活的条件差异较大,同时满足其萌发和幼苗存活和生长的窗口条件比较严苛。其野生生长地的生境条件往往难以满足要求,这是限制蒙古莸通过有性繁殖进行自然种群扩散的主要原因之一。
英文摘要	Caryopteris mongolica,a rare and endangered small shrub,is mainly found in arid grasslands in northern China. Its distribution areas have rapidly contracted in recent years. In this study,an attempt was made to investigate the causes of the low survival rate of seedlings under local field conditions. The study combined a field survey of seedling survival with laboratory assessments of seed germination and seedling growth under different environmental conditions to establish the difficulties for C. mongolica seedling establishment. We selected a C. mongolica community in arid grasslands. The survival capacity of seedlings,seed germination,and seedling establishment under different temperatures,water cycles,and water quantities were determined. Climate and soil conditions were also studied. The following results were obtained. (1) Under field conditions,a large number of seeds germinated during the period from May to July,but few seedlings survived due to a high seedling mortality. The natural regeneration rate for the plant seedlings was 0.11 plant/m~2,because of the very high mortality rate of seedlings. (2) Seeds of C. mongolica had no dormancy after ripening. Seed germination requirements showed a relatively wide range of moisture conditions,but a narrow temperature range of 2530℃. The optimum burial depth for seed germination was 1015 mm. The seeds of C. mongolica can complete germination within 15 days when sown under suitable conditions. The water cycle had no significant effect on germination. The seeds buried in shallow soil were able to imbibe rapidly after full precipitation. (3) The most suitable temperature for seedling growth was approximately 25℃,although seedlings could tolerate a high temperature of up to 50℃ for a short period. Prolonged high or low temperature and frequent watering increased seedling death. The water cycle significantly influenced plant height and stem basal diameter. Shortening the water cycle can increase the height and stem thickness of C. mongolica. There was a significant influence of temperature on leaf age. The optimum temperature for leaf growth of C. mongolica was 25℃. Furthermore,variable temperature conditions were beneficial for erect growth and the thickening of stems. It was concluded that C. mongolica has relatively strict requirements for seed germination and seedling growth. The discrepancy between germination and seedling growth requirements narrowed the seedling establishment window. In the natural habitats of C. mongolica,the conditions are often not able to meet the requirements for the entire process from seed germination to seedling establishment. This is the main reasons for the relatively poor dispersion of C. mongolica populations through sexual propagation under field conditions.
中文关键词	实生苗 ; 温度 ; 水分 ; 埋深 ; 胁迫
英文关键词	seedling temperature moisture burial depth stress
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6285380
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238130
作者单位	1.内蒙古农业大学草原与资源环境学院, 呼和浩特, 内蒙古 010011, 中国; 2.内蒙古农业大学草原与资源环境学院;;内蒙古和盛生态科技研究院有限公司, ;;, 呼和浩特;;呼和浩特, ;; 010011;;011517
推荐引用方式 GB/T 7714	贺一鸣,李青丰,贺晓,等. 环境因子对蒙古莸种子萌发及幼苗建成的影响[J]. 内蒙古农业大学,2018,38(13):4724-4732.
APA	贺一鸣,李青丰,贺晓,樊如月,段茹晖,&刘洋.(2018).环境因子对蒙古莸种子萌发及幼苗建成的影响.生态学报,38(13),4724-4732.
MLA	贺一鸣,et al."环境因子对蒙古莸种子萌发及幼苗建成的影响".生态学报 38.13(2018):4724-4732.