珠江源区退化林地植被恢复树种选择研究

以珠江上游的流域地区为研究区域,选择6个树种进行树种对比试验,并对水土流失进行监测.结果表明:参试树种表现出较好的适应性,旱冬瓜生长最为迅速,其它树种生长情况依次为圆柏>藏柏>柳杉>川滇桤木>云南松.生物多样性在不同地类上有一定差异,其表现依次为退耕地阴坡>荒草地>退化林地>阳坡耕地.经过5年的造林恢复植被,土壤养分得到改良,土壤的结构得到了改善.试验区的土壤侵蚀减少了38.48%,水土流失面积减少44.32%.

Study on Tree Species Selection for Degraded Vegetation's Rehabilitation in Zhujiang Source Region

Six tree species were selected for comparative experiment from the area of upper reaches of Zhujiang.The monitoring on water and soil erosion was conducted.The results indicated better adaptation of the tested species in general.Alnus nepalensis's growth was the fastest,other species' growth as Chinese Juniper>Cupressus torulosa>China Cedar>Szechwan in order;Biodiversity had differences in diverse land types;the order was shade slope of returned farmland > barren grassland > degraded forestland > southern slope of farmland in particular.Rehabilitated vegetation by 5 years of forestation made the soil nutrient and structure greatly improved,but it made soil erosion decreased 38.48%,and area of soil and water erosion reduced 44.32% respectively.