水土严重流失地区相思类树种选择的初步研究*

在被当地群众称之为“烂头山”的水土严重流失地区，引入原产澳大利亚的耐旱相思后，成功地改变了荒山秃岭的面貌，初步控制了水土流失。经过３ａ连续试验和观测，在１８个树种４９个种源中，初步筛选出并行相思１７０２４、１７１４１号种源；大叶相思１６３５５、１６１４７、１６４８４号种源；黄花相思１５４８１、１４９６８、１４５９０号种源；薄荚相思１６１１０、１５４７８号种源；鞘尾相思１７９０６、１７０５０号种源；丝毛相思１６６４３、１５７３２号种源；厚荚相思９１０００号种源；大花相思１４６６８号种源；巴氏相思１７７１８、１５４８０、１６１３４号种源等９个树种１９个种源，这些树种与种源适应性强，速生，生物量大，植后当年即可郁闭，枯枝落叶覆盖了林地，初步起到保持水土的作用。

Study on Selection of Acacia Species/Provenances in Water and Soil Serious Erosion Area

After the introduction of aridity-tolerant acacias from Australia to Luokeng area where there are serious water and soil erosion,the face of the barren hill has been obviously changed and the water and soil erosion was preliminarily controlled.As for the result of 3 years'trial,there are 9 species and 19 provenances better than others,such as A. concurrens 17141,A. auriculiformis 16355,16147,16484,A. flavescens 15481,14968,14590,A. leptocarpa 16110,15478,A. colei 17906,17050,A. holosericea 16643,15732,A. crassicarpa 91000,A. ampliceps 14668 and A. brassii 17718,15480,16134. These species and provenances have good adaptability to poor site,fast growth and high biomass. In the first planting year they can close the crown,produce lot of litters to'cover the land and play an important role in the water and soil conservation.