桤木杉木混交林水源涵养能力研究

Study on Water Conservation Capacity of the Mixed Plantations of Alnus cremastogyne and Cunninghamia lanceolata

为解决目前南方林区人工林针叶化引起的系列生态问题，发展阔叶树种造林，对桤木杉木混交林和杉木纯林的林分持水量、土壤渗透性能、贮水性能等水文效应进行了研究，结果表明：各混交林的林分水源涵养能力均优于杉木纯林，其中以桤木杉木行间混交最好，地上部分持水量为31．72t／hm^2，0～40cm土层最大贮水量为127.12mm。

Mixed plantations composed of coniferous and broadleaved tree species have been recommended to mitigate ecological degradation caused by successive rotation of the coniferous in south China forest areas. An array of indices including water holding capacity of the plantation soils, soil filtration property and water conservation characteristics and other hydrdogical properties of the pure stand of Cunninghamia lanceolata were measured and compared with those of the mixed plantations composed of C. lanceolata and Alnus cremastogyne. The results showed that the water conservation capacity of the all varied mixed plantations was higher than that of the pure C. lanceolata plantation. The plantation of A. cremastogyne mixed with C. lanceolata every other rows was the best pattern, whose above ground water holding capacity was 31.72 t/hm^2, and the maximum of water holding capacity of 0 - 40 cm soil stratum under the mixed plantation was 127.12 mm.