Mechanism of high biomass production and stability of intercropped green manure species

间作下生产力的提高归因于环境资源的互补利用。然而，由于技术上的困难，间作下组份种的生根模式作为考虑养分互补吸收的重要形态特征，在大田条件下的研究很少。采用新开发的多色染色技术，对三种绿肥单作和间作的生根模式进行了研究。间作下高粱根系分布较单作深；它是间作下生物量增加的最主要贡献者。单作和间作下的Crotalaria均具有较深的生根系统。根系较浅的向日葵在间作条件下生长受到极大抑制，可能是后期缺水所致。多色染色法检测的绿肥品种的生根模式与其间作条件下的地上生产性能密切相关。

Greater productivity under intercropping has been attributed to the complementary use of environmental resources. However, the rooting pattern of component species under intercropping, which is an important morphological feature considering the complementary uptake of nutrients, has been studied only rarely under field conditions because of inherent technical difficulties. I examined rooting patterns of three green manure species, both sole cropped and intercropped, using a newly developed multi-color staining technique.Sorghum distributed roots deeper under intercropping than under sole cropping ; it was the most important contributor to increased biomass under intercropping. Crotalaria had a deep rooting system under both sole cropping and intercropping. Sunflower, with a shallow rooting system, was suppressed extremely under intercropping, possibly because of water deficiency in late in the season. The rooting patterns of green manure species examined using multi-color staining were related closely to the aboveground performance of these species under intercropping.