【摘要】 陕南低山丘陵区是长江流域水土流失最为严重的区域之一。防护林体系是改善环境，恢复生态平衡的关键性措施。对陕南低山丘陵区防护林体系进行层次分析表明，本区防护林体系建设应以发展经济林为突破口，用材林、防护林、薪炭林并重，各林种的相对权值分别为４０．３３％、２３．５２％、２８．６１％和７．５４％。在树种选择上应首先考虑柑桔、桃、杏、马尾松、油松、华山松、杉木、水杉、刺楸、樱桃、栎类、漆树、刺槐、杜仲、红椿、茶等树种，以使防护林体系总体功能最优，效益最大。更多还原

【Abstract】 The lower mountain and hills region of southern Shaanxi is a typical area with the most serious soil and water losses in the Yangtze River Valley, the protection forest system is a key measure to improve environmental condition and to rehabilitate ecological equilibrium ,the system diagnosis for protection forests by using analytical hierarchy process shows that planting economical forests in the lower mountain and hills region of southern Shaanxi is a efficient way for the construction of protection forest system; the timber forests, protection forests and firewoods forests showed be taken an different consideration on the basis of local condition, their relative weights for those four categories are 40. 33%, 23. 52%, 28. 61 % and 7. 54% respectively. On the selection of tree species, the following trees showed be considered in advance: Citrus reticalata, Prunus persica, Prunus armeniaca, Pinus massoniana, Pinus tabulaeformis, Pinus armandii, Cunninghamia lanceolata, Metasequoia glyptostroboides, Kalopanax septemlobus, Prunus pseudocerasus, Quercusspp, Toxicodendron verinfluum, Robinia pseudoacacia, Eucommia ulmoides, Toona sinensis, Camellia sinensis etc to optimize the function and economical benefits Of the protectionforest system.更多还原