基于海棠茎干含水率的智能灌溉控制策略研究

茎干含水率的动态变化是研究植物体水分和生长状况的重要指标,准确判断活立木水分亏缺是人工林抚育和城市园林绿化中灌溉策略制定的重要科学依据。以海棠树为研究对象,以茎干含水率为研究参数,通过干旱胁迫试验探究茎干含水率变化与海棠树生理需水的关系。提出以海棠茎干含水率43%和茎干含水率下降值不超过12%为下限指标、土壤含水率33%为上限指标的灌溉控制策略,依据此策略设计了一套智能灌溉控制系统,并通过该系统验证了所提出灌溉策略的有效性与可行性。

Research of Intelligent Irrigation Control Strategy Based on Stem Water Content of Crabapple

The dynamic change of stem water content is an important index to study the water content and growth condition of plants, which provides scientific basis for accurately judging the water deficit of active wood, plantation cultivation and irrigation of urban landscaping. Taking the potted crabapple as research object, and the relationship between the change law of stem water content and physiological water requirement of trees was explored through drought stress experiment. Drought stress was divided into two phases, the first phase lasted five days and the second phase lasted ten days. The decrease in stem water content in the second stage was larger than that in the first stage. And the number of leaves withered in the second stage was more than in the first stage. Comprehensively considered the ornamental nature of crabapple, the research took the first stage of drought stress experiment as research node. It was obtained that the stem water and soil water of crabapple showed a one-degree cubic polynomial relationship under natural drought conditions. An irrigation control strategy with stem water content (43%) and stem water content reduction range (12%) as the lower limit index and soil water content (33%) as the upper limit index was proposed. According to the strategy, an intelligent irrigation control system was designed, and the effectiveness and feasibility of the proposed irrigation strategy were verified by the system.