一、马桑结根瘤、固氮 马桑(Coriaria sinica maxim,附图见封二,图1)是多年生落叶灌木,在我国华北、西北、西南和华中广泛分布,多生于海拔400—2100米的灌木丛中,耐瘠薄干旱,在酸性和石灰性土壤和岩石风化物上均能生长,是一种先锋植物。全株各部都含马桑碱,有毒,群众用作土农药或绿肥。 First, the Ma Sang node nodules, nitrogen-fixing Ma Sang (Coriaria sinica maxim, see Figure 2, Figure 1) is a perennial deciduous shrub, widely distributed in North China, Northwest China, Southwest China and Central China, more than 400-2100 meters above sea level Shrubs, resistant to infertile drought, in acidic and calcareous soil and rock weathering things can grow, is a pioneer plant. All parts of the whole plant contains Marcin base, toxic, the masses as soil pesticides or green manure.