| 摘要: |
| 以40 年生腾冲红花油茶Camellia reticulata 纯林为对象，研究了腾冲红花油茶根系、枝条、叶片含水率年内变化规律。结果表明，腾冲红花油茶根系、枝条、叶片和三器官综合的年均含水率分别为（49.89±3.42）%、（52.81±1.85）%、（56.41±3.32）% 和（52.46±2.58）%。叶片和枝条含水率在年内都表现出“下降—上升—下降”的变化趋势。3 月，叶片含水率下降到年内最低值51.70±2.61%，然后快速上升，至5 月达到年内最高值，为（61.86±3.98）%，随后缓慢下降到12 月年底接近年初值；枝条含水率1 至4 月下降到年内最低水平（50.02±1.51）%，然后迅速上升，至6 月份达到年内峰值（57.51±2.1）%，以后逐渐下降，至12 月份趋近年初水平；根系含水率的年内变化表现出“下降—上升—相对稳定—下降”的变化规律，1 至5 月根系含水率下降至全年最低水平，为（46.05±1.43）%，6 月急速上升达到（52.40±4.55）%，然后处于一种相对稳定的状态至9 月份，10 月后逐渐下降趋近年初值。鉴于腾冲红花油茶各组织器官含水率的变化特性，生产中应在3 月底、4 月初给腾冲红花油茶充足灌水。在特别干旱，无法满足灌水的情况下，可以采取梳梢、断梢、梳花、梳果等措施削弱地上部分的生长势。同时，减小叶面积，降低蒸腾速率，保障树体各器官有维持生命活动的水分，避免植株因根系脱水死亡。 |
| 关键词: 腾冲红花油茶 营养器官 含水率 |
| DOI： |
| 投稿时间：2020-08-17修订日期：2020-10-16 |
| 基金项目: |
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| Analysis on Annual Changes of Moisture Content in Vegetative Organs of Camellia reticulata |
| XIE Yin,YUZuhua,YIN Biqi,WANG Zihong,CUN Minghui,XU Zhiying,WU Xingbo,YANG Zhongpin |
| (Experimental Station of Camellia reticulata, National Center for Oil-tea Camellia Science and Technology;Tengchong Forestry Technology Extension Station;Experimental station of Camellia reticulate,National center for oil-tea camellia science and technology;Tengchong Forestry Technology Extension Station,Tengchong Yunnan) |
| Abstract: |
| The 40-year-old pure Camellia reticulata stands were studied. The results showed that the water contents of roots, branches, leaves and three organs of C. reticulata were (49.89±3.42)%, (52.81±1.85)%, (56.41±3.32)% and (52.46±2.58)% respectively. The water content of leaves and branches showed a trend of “decrease-increase-decrease” during the year. In March, the leaf water content decreased to the lowest value of (51.70±2.61)% in a year, then increased rapidly, and reached the highest value of (61.86±3.98)% in May, then decreased slowly to the end of December. The branch water content decreased to the lowest level of (50.02±1.51)% in the first four months of the year, then increased rapidly, reached the peak of (57.51±2.1)% in June, then decreased gradually, and reached the level of early year in December. The annual variation of root water content showed a regular pattern of“ decline-rise-relative stability-decline”. From January to May, the root water content decreased to
the lowest level of (46.05±1.43)% in the whole year, and rose sharply to (52.40±4.55)% in June, it then remained in a relatively stable state until September and gradually declined towards the beginning of the year after October. In view of the changing characteristics of water content in various tissues and organs of C. reticulata, sufficient water should be poured into C. reticulata at the end of March or the beginning of April in production. Combing shoot, cutting shoot, combing flower, combing fruit and other measures can be taken to weaken the growth potential of the above-ground part. At the same time, reducing the leaf area and transpiration rate to ensure that the organs of the tree have water to maintain life, and avoid the death of the plant due to root dehydration. |
| Key words: Camellia reticulata vegetative organ water content |
