论文部分内容阅读
作者在1979年试验前和1982年即试验后第4年,对土壤团聚体结构进行了测定。共5个处理:1——行间秋耕休闲,2——株间秋耕休闲,3——生草化,4——除莠剂(西玛津)处理,5——薄膜覆盖。4年后,不论株间或行间秋耕休闲的土壤,甚至在早播条件下,与1979年时相比较,其团聚体结构均有所下降。大于0.25mm的团粒总量,已从96.90%降至:株间90.20%,行间84.54%。对事先未达毛管饱和的湿播土壤分析表明,秋耕休闲的土壤结构也在诼渐下降。1979年毛管饱和的湿播土壤分析,
The authors determined the soil aggregate structure before 1979 and in 1982, the fourth year after the experiment. A total of 5 treatment: 1- line autumn leisure, 2- autumn plant leisure, 3 - grass, 4 - herbicides (Simazine) treatment, 5 - film coverage. Four years later, no matter whether the cultivated soil was planted or cultivated in autumn or even in autumn, its aggregate structure decreased even in the early sowing conditions compared with that in 1979. The total amount of aggregates larger than 0.25mm decreased from 96.90% to 90.20% between strains and 84.54% between rows. Analysis of wet-sowed soils that did not reach capillary saturation in advance suggests that recreational soil structures are also gradually declining. Saturated capillary sowing soil analysis in 1979,