1) mowing system
Considering of these problems,The effect of different mowing systems on the standing crops,species composition,community structure and nutrient content of Stipa grandis grassland of typical steppe is designed and analyzed.
2) institutional segmentation
Modem economic theory assumes that the institutional segmentation is not existed while inspecting the generation and development of in- dustrial cluster.
3) tapping system
The effect of different tapping systems was studied on promising rubber clone SCATC 8-79 in yield, dry rubber content and the content of sucrose, phosphorus, thiol and Mg2+.
The particle sizes and particle size distributions of the latex from three tapping systems including the traditional tapping system (A), the current chemical-stimulation tapping system (B) and the excess-stimulation tapping system (C) were determined by using of the laser particle size analyzer.