蔬菜大棚墒情传感器垂向埋设位置研究

针对当前国内外墒情传感器分层布置的习惯及降低传感器埋设量的愿望,研究了蔬菜大棚墒情传感器在垂向上的代表性问题。以江苏省宿迁市宿城区番茄大棚为例,利用Hydrus-1D模型分别模拟番茄苗期、开花坐果期和盛果采摘期灌水之后15 d内的根系层内含水率分布变化的情况。根据模拟结果,将40 cm的主要根系层平均分为10个土层,通过对灌水后各个土层含水率与根系层平均含水率进行显著性检验,进一步将无显著性差异土层内各测点的含水率与根系层平均含水率进行比较。结果表明,10~16 cm深度区域的土壤含水率基本能够代表根系层的平均含水率。因此,蔬菜大棚内单个墒情传感器应当埋设在10~16 cm的深度范围。

A Study on Vertical Buried Position for The Soil Moisture Sensor in Vegetable Greenhouse

For the current domestic and abroad habit of the moisture sensor arrangement and the desire to reduce the use of the sensors,this paper studied the vertical buried position of the soil moisture sensor in vegetable greenhouse.Taking the tomato greenhouse in Sucheng district of Suqian City, Jiangsu province as an example, the Hydrus-1D model software is used to simulate the water movement in root layer range.The start time of the simulation is one day after irrigation, and the time length is 15 days.3 simulations, including seeding stage, flowering & fruit set stage and fruit picking stage, are conducted.Based on the simulation results, the main root zone is equally divided into 10 layers.Through significance tests and error analysis between soil moisture of layers and the average soil moisture of the main root zone, it is discovered that the soil moisture in 10~16 cm depth is close to that of the main zone layer, so the ranges of 10~16 cm depth is the best place for single soil moisture sensor in vegetable greenhouse.