不同密度马尾松人工林水源涵养能力的比较

对广西横县镇龙林场不同密度（2 m×2 m、2 m×1.5 m、1.5 m×1.5 m和1 m×1.67 m）的14年生马尾松（Pinus massoniana）人工林凋落物层和土壤层的水源涵养能力进行比较研究。结果表明：密度为2 m×2 m和1.5 m×1.5 m的马尾松林凋落物层蓄积量小于2 m×1.5 m和1 m×1.67 m的马尾松林蓄积量,1 m×1.67 m的马尾松林凋落物层蓄积量最大。凋落物层最大持水量与凋落物层蓄积量呈极显著正相关（P〈0.01）。密度为2 m×2 m和1.5 m×1.5 m的马尾松林土壤层最大持水量大于密度为2 m×1.5 m和1 m×1.67 m的最大持水量;综合水源涵养力则取决于土壤层持水量的大小,4个林型的水源涵养力依次是2 m×2 m〉1.5 m×1.5 m〉2m×1.5 m〉1 m×1.67 m。本研究为马尾松人工林生态功能量化研究提供科学依据。

Comparison on Water-holding Capability of Pinus massoniana Plantations with Different Densities

The water-holding capability of litter and soil in 14-year-old Pinus massoniana plantations with different densities（including 2 m × 2 m,1.5 m × 1.5 m,2 m × 1.5 m and 1 m × 1.67 m） was compared in Zhenlong forest farm of Guangxi province.The results showed that litter accumulation was higher in 2 m × 1.5 m and 1 m × 1.67 m plantations,and the biggest value was in 1 m × 1.67 m plantation.There was positive relationship between litter accumulation and its maximum water-holding capacity（P0.01）.The maximum water-holding capacity of soil tended to be higher in 2 m × 2 m and 1.5 m × 1.5 m plantations.The integrated water-holding capacity depended on the size of water-holding capacity in soil.The order was 2 m×2 m1.5 m×1.5 m2 m×1.5 m1 m×1.67 m.Our study provided scientific basis for quantization of ecological function in Pinus massoniana plantations.