人们都珍惜自己栽种的花草果木,盼望它们花繁叶茂,硕果累累。有人唯恐花木干枯,不断地大量浇水,结果事与愿违,使植物生长不壮,甚至死亡。如果把致死的植株挖出来观察,可发现它的根系已腐烂发黑了。植物生长是离不开水的。但是,浇水必须适度,浇水过量,会使土壤板结,土壤中的空气被水代替,造成土壤缺氧,使根的呼吸作用受到抑制,各种生理功能减弱,抵抗力降低。再加上厌氧细菌在缺氧的条件下大肆活动,产生有害气体,终于使植物的根系腐烂致死。那么,水培植物为什么能够生长呢?当然,水培植物根的呼吸作用也会受到一定的影响,所以人们常采取措施来弥补供氧不足的缺点。可采取用流水和循环式的方法供 People cherish their own planted flowers and fruit trees, hoping they flourish, fruitful. Some people fear that the flowers dry, and continue to water a lot, the result is contrary to expectations, so that plant growth is not strong, or even death. If we dug the lethal plants and observed them, we found that the roots of the plants had become rotten and black. Plant growth is inseparable from the water. However, watering must be moderate, excessive watering will make the soil compaction, the air in the soil is replaced by water, resulting in soil hypoxia, so that the respiratory effects of roots are inhibited, a variety of physiological functions weakened, reducing the resistance. Coupled with anaerobic bacteria in hypoxic conditions wantonly activity, resulting in harmful gases, and finally make the plant’s root rot. So, why hydroponic plants can grow? Of course, the hydroponic root respiration will also be affected to some extent, so people often take measures to make up for the shortcomings of lack of oxygen. Can be taken by means of running water and circulation