The results show that the red pine woods is a weak ecosystem, which may be the cause of spreading plant diseases and pest insects.
指出目前的赤松林是一种脆弱的生态系统，这是病虫害蔓延的原因。
The main factor that affects population's uniformity is invalid plant including inbred lines, barren stalk rate, diseases and pest insects plant in populations of different yield level.
无效株是影响群体整齐度的重要因素，主要包括：自交株、空秆、小穗株及病虫害株等。
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