自然界中,生物的种间关系十分复杂,相亲相克现象普遍存在。就植物而言,无论花草,还是树木,不同的科、属、种之间,有的能和平共处,有的却水火不容。 植物相亲的一面表现为相互促进、共同生长。比如葡萄园里种上紫罗兰,能相互促进,结出的葡萄香味更浓;枣树与小麦间作,可提高枣树产量,又能使小麦免受干热风影响;在果园里种植绿肥植物、豆类、花生等可以肥沃土壤,控制杂草,还能促进果树结果。 植物间还有相克现象。如梨树和桧柏之间就水火不容,因为它们之间有一种共生病害——梨—桧柏锈病,在果园周围栽植桧柏,就会加剧梨锈病的危害程度。若果园周围5 In nature, the interspecific relationships of living things are very complicated, and the appearance of relatives and friends is common. In terms of plants, no matter the flowers and trees or the trees, different families, genera and species can coexist peacefully, while others can not tolerate it. The blind date of plants shows mutual promotion and mutual growth. For example, the cultivation of violets in the vineyard, can promote each other, resulting in a thicker grape flavor; jujube and wheat intercropping can increase jujube yield, but also the wheat from dry hot air; planting green manure in the orchard, beans Classes, peanuts, etc. can fertile soil, control weeds, but also promote fruit tree results. There is also a g phenomenon between plants. Such as pear tree and juniper between the incompatible, because there is a symbiotic disease between them - pear - cypress rust, planted around the orchard cypress, it will exacerbate the pest risk of pear. If the orchard around 5