Abstract:

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.lanceolata-E.grandis×E.urophylla forest, C.lanceolata-Michelia macclurei forest and C.lanceolata-Pinus massoniana forest are almost same, and as twice as C. lanceolata-E.grandis×E.urophylla forest. The bulk density of soil in C.lanceolata-E.grandis×E.urophylla forest was the largest, but other three were no differences. Soil organic matter and nutrient content in C.lanceolata-M.laosensis forest was the largest, others were no difference. The results showed that water conservation and soil improvement in abroadleaved conifer mixed forest was far greater than pure forest.

Key words: Cunninghamia lanceolata, Mixed forest, Water conservation, Soil properties