摘要
为探究植物先花后叶的影响因素,本研究以1963-1988年间北京地区杏和山桃展叶和始花物候资料及相应的日最高、最低温度数据为基础,利用偏最小二乘回归法确定杏和山桃叶芽及花芽的需冷期和需热期,进而利用动态模型和生长度小时模型分别估算叶芽和花芽的需冷和需热量。结果表明,依据长期物候观测资料,利用偏最小二乘回归法进行植物需冷和需热量的估算非常有效。先花后叶植物叶芽和花芽需冷量几乎相同,需热量的差异是导致植物先花后叶的主要原因。杏和山桃花芽的需热量分别为2 829.7±876.2和1 457.2±581.2生长度小时,而相应叶芽需热量却是花芽的两倍之多。基于物候观测的重要性及实用性,中国物种水平上的地面观测应得到进一步深入发展。
To clarify which agroclimatic requirements control the sequential occurrence of flowering and leaf unfol- ding in hysteranthous plants, Partial Least Squares （PLS） regression analysis was used to identify the chilling and forcing period of leaf and flower buds. The Dynamic Model and the Growing Degree Hour Model were applied to esti- mate the chilling and heat requirement for leaf unfolding and flowering, based on the phenological records of apricot and mountain peach and daily maximum and minimum temperature data in Beijing during 1963-1988. The results indicated that PLS regression analysis is a useful approach to calculate the chilling and heat requirements of plants when long term phenological observations are available. Leaf and flower buds were found to have similar chilling re- quirements but different heat requirements, which explained the earlier occurrence of flowering compared to leaf un- folding. The heat requirements of flower buds of apricot and mountain peach were 2 829.7 ± 876. 2 and 1 457.2± 581.2 Growing Degree Hours, respectively, while heat requirements of vegetative buds were almost twice as high, In view of the importance and usefulness of phenological observations, species-level ground observations in China should be continued and extended.
出处
《植物分类与资源学报》
CAS
CSCD
北大核心
2014年第2期245-253,共9页
Plant Diversity
基金
The National Natural Science Foundation of China(NSFC)(31270524)
关键词
先花后叶植物
需冷量
需热量
叶芽
花芽
Hysteranthous plant
Chilling requirement
Heat requirement
Leaf bud
Flower bud
