黄土半干旱区林草复合优化配置与结构调控研究进展

林草复合系统是我国干旱与半干旱地区陡坡农林复合的主要模式之一。该文在综述黄土高原林草复合模式生态效益、社会效益、经济效益的基础上，对黄土半干旱区林草复合优化配置与结构调控研究进展进行了研究，提出了适宜黄土半干旱区林草复合的造林树种为刺槐和油松，草种为以苜蓿为代表的豆科类优质牧草。并对目前晋西黄土区林分密度研究进行了分析，根据水量平衡原则确定了适宜于在黄土高原推广应用的林分合理密度计算公式。在对黄土高原林草复合研究现状进行分析的基础上，提出了黄土高原林草复合研究中存在的问题，以及未来的发展方向，旨在为黄土高原退耕还林及水土保持人工林建设提供借鉴。

Review on Structure and Optimal Allocation of Forest-grass Strip-intercropping System in Semi-arid Area of Loess Plateau

Forest-grass strip-intercropping system is one of the main models of agroforestry on steep slopes in arid and semi-arid area of Loess Plateau in China.Based on assessment of ecological,social and economic benefits of forest-grass strip-intercropping system,this paper presented the review on structure and optimal allocation of forest-grass strip-intercropping system in semi-arid area of Loess Plateau.The authors put forward that,the suitable species are Robinia pseudoacacia,Pinus tabulae formis,and leguminous grass(Medicago sativa,Astragalus adsurgens,Melilotus officinalis etc.) in forest-grass strip-intercropping system in semi-arid area of Loess Plateau.And a formula to calculate appropriate density for forest in the Loess Area has been developed through analysis on the balance of water supply and water consumption.Based on the analysis of recent studies on forest-grass strip-intercropping system,some current problems and future suggestions have been given to the research on forest-grass strip-intercropping system in Loess area.The authors hope this review can provide some useful references to process the forest ecological project in Loess area.