林业科学2016，Vol.52Issue(10)：22-30,9.DOI:10.11707/j.1001-7488.20161003
供水量对花榈木苗期耗水、生长和生理的影响及灌溉制度优化
Effects of Water Supply on Water Consumption,Growth and Physiological Processes of Ormosia henryi Seedlings and the Irrigation System Optimization
摘要
Abstract
Objective]Ormosia henryi is listed as the precious timber species under state protection ( category ii) . For providing a theoretical basis of water supply according to demand of O. henryi seedlings at different growth stages,we conducted this study on the water consumption rule of O. henryi seedlings at different growth stages under different water supply and on the effect of water supply conditions to growth and physiological processes of O. henryi seedlings,to save water,reduce nutrient loss and improve seedlings quality. [Method]We conducted a potting experiment in which six relative water content gradients were set,that is,of 90%,80%,70%,60%,50% and 40%,controlled by weighing filling water method. The water consumption dynamic per a seedling and the growth,physiological and biochemical indices of one-year-old O. henryi were measured with six different substrate moisture contents.[Result]In the six different water regimes,both the daily and monthly water consumption of O. henryi seedlings were smaller at early growth stage (15 -76 d) and later growth stage (185 -231 d),while the water consumption was bigger in fast growth period (77 -184 d). The daily water consumption presented two peak periods,they were 92 -107 d and 139 -169 d,respectively. The biggest daily water consumption ranged from 10. 12 mL to 18. 84 mL. The monthly water consumption of 5 -month-old seedlings (136 -169 d) was biggest,ranging from 307. 62 mL to 565. 26 mL. The total water consumption of seedlings increased with increase of soil moisture content in the range of 40% -80%,and when the relative water content was 80%,the total water consumption of seedlings was biggest,with 3870. 99 mL water. The growth and physiological indices of seedlings existed significant differences (P<0. 05) in the six different water regimes. When the relative water content was 80%, the height,ground diameter,biomass and root indicators of O. henryi seedling were all better than the other water treatments,and the total chlorophyll content was higher,and the malondialdehyde content,SOD activity,proline content and soluble sugar content were lower than the other water regimes. It was shown that too high or too low relative water content inhibited growth of the seedlings. In synthetic consideration of seedling growth,physiology and water consumption characteristics,the relative water content of 80% was best for cultivating the high quality seedlings of O. henryi,and also realizing the efficient use of water.[Conclusion]Different water supply significantly affect the water consumption,growth and physiology of O. henryi seedlings at different stages. It is benefit for cultivating O. henryi seedlings in the relative water content of 80%,in which the height,ground diameter,biomass and root indicators of O. henryi seedling are superior to other water treatments,and the physical performance also is the best. In terms of the overall quality of seedlings,according to the water consumption rule of O. henryi seedlings under 80% relative water content,we have formulated the optimization irrigation system for O. henryi container seedlings at different growth phases,that is,the irrigation water volume per month is 178 . 35 ,232 . 47 ,469 . 98 ,436 . 59 ,565 . 26 ,367 . 35 and 329 . 55 mL when the seedlings age is 15 -45,46 -76,77 -107,108 -138,139 -169,170 -200 and 201 -231 d,respectively.关键词
花榈木/供水量/耗水量/生长特性/生理特性/灌溉制度Key words
Ormosia henryi/water supply/water consumption quantity/growth characteristics/physiology characteristics/irrigation system分类
农业科技引用本文复制引用
姜顺邦,韦小丽..供水量对花榈木苗期耗水、生长和生理的影响及灌溉制度优化[J].林业科学,2016,52(10):22-30,9.基金项目
贵州省国际合作项目“珍贵用材树种花榈木精准化容器育苗理论与技术研究”(黔科合外 G字［2012］7012号) （黔科合外 G字［2012］7012号）
国家自然科学基金“花榈木根瘤菌多样性及幼苗形成调控因素研究”(31460193) （31460193）
贵州省林业厅重大攻关项目“贵州优质阔叶用材树种培育技术与示范”(黔林科合［2010］重大02)。 （黔林科合［2010］重大02）
