宁南黄土丘陵区造林技术的研究

在自然环境恶劣，水土流失严重的黄土丘陵区，建造人工林生态系统工程，本身就需要一个复杂的过程。尤其是建造人工林生态系统工程与天然林比较起来的时间周期是十分短暂的。为了短期内形成一个稳定的生态系统，就必须充分吸取和借鉴自然生态系统中生物之间“共能性共生”机制、，减少抗生、竞争等不利因素，使人工林生态系统在最短期间达到稳定与高效能。

Research on Afforestation Techniques in Southern Ningxia in Loess Hilly Area

It needs a long complex process to establish an artificial froest ecosystem in the fragile natural environment with serious soil and water loss in loess hilly area, Because the artificial forest should be steady and productive within a very shorter period than that of natural forest needs, we should study the ecological relationship of natural system.The system we built should have as less as possible of resistant and competitation in it, so that the system could be efficient.Therefore the structure and function of those artificial system is the key in their erecting process.We had made a wrong step in land harnessing and afforesting for our overlooking to the natural law.