在园林实践中,常对针叶树种采取喷水灌溉的方法,以达到降温、除尘及灌溉的目的。但是若长期使用高硬度水,容易对其产生危害。下面用一则实例来说明:时逢春季干旱,某公园对白皮松进行连续多天的喷水灌溉,旱情虽暂时得到缓解,但事后发现,被喷过的白皮松通体呈灰白色,若用手指拂之,可抹下一层灰白色的粉末,不久,原本长势良好的白皮松开始针尖失绿,继而呈半截枯斑状,针尖未老先落、笔者对此进行了仔细的观察与研究,之后 In the practice of gardens, conifers often take the method of sprinkler irrigation in order to achieve the purpose of cooling, dust removal and irrigation. However, if the long-term use of high hardness water, easy to harm it. Here is an example to illustrate: When the spring drought, a park on the white pine for many days of continuous sprinkler irrigation, although the drought has temporarily been alleviated, but afterwards found that was sprayed white pine body is gray, if the brush with the fingers , Can be wiped a layer of off-white powder, and soon, the original white bough pine needle began to turn green, and then showed half dead spot, the tip has not been the first to fall, the author of this careful observation and research, after