杉木混交林水源涵养和土壤性质研究

STUDY ON WATER CONSERVATION AND SOIL PROPERTIES OF CHINESE FIR MIXED STANDS

对南亚热带杉木混交林的水源涵养和土壤肥力进行了研究。结果表明 ,不同杉木混交林的水源涵养、土壤结构体、孔隙状况、水分状况和土壤化学性质均有明显差别。不同类型的混交林的持水能力不同 ,以杉木 -米老排混交林的最大 ,杉木 -火力楠与杉木 -马尾松的持水量很接近 ,杉木 -巨尾桉混交林的最小 ,其中杉木 -米老排的林分持水量达杉木 -巨尾桉的 2 2倍 ,杉木 -火力楠也达到杉木 -巨尾桉的 2倍 ,主要是由于杉木 -巨尾桉混交林的土壤的持水能力较小造成的。杉木 -巨尾桉混交林的土壤容重最大 ,土壤孔隙度最小 ,而其它 3种类型的差异不明显。土壤有机质含量及养分含量以杉木 -米老排混交林的最大 ,其它 3种类型则差异不大。这说明针阔混交具有较强的培肥土壤和水源涵养作用 ,对防止杉木多代连栽造成的地力衰退具有重要意义。

After carefully studying on water conservation and soil fertility in Chinese Fir (Cunninghamia lanceolata)mixed stands in southern subtropical area, the paper showed that the water-holding capacity and soil chemical properties in the mixed stands were better than those in pure stand. The ability of water holding in C.lanceolata-Mytilaria laosensis forest was the largest, but C.lanceolata-Eucalyptus grandis×E.urophylla forest was the smallest, and in C.lanceolata-M.laosensis forest was 2.2 times as C.lanceol...