摘要
对赣江源不同密度30年生湿地松人工林土壤物理性质和持水性能进行了研究。结果表明:不同密度湿地松林下土壤容重随土壤深度增加而变大,土壤孔隙度变化幅度为43.83%~68.75%。不同密度林分类型的土壤平均最大持水量、平均毛管持水量和平均非毛管持水量相对大小依次为2 500株/hm^2(1 300.39、909.10、392.29 t/hm^2)>2 125株/hm^2(1 226.16、903.97、322.19 t/hm^2)>2 000株/hm^2(1 077.72、795.07、282.66 t/hm^2)>1 625株/hm^2(1 017.22、811.38、205.84 t/hm^2)。土壤持水量与时间的变化规律符合指数函数回归方程Y=a·e-bx。
The soil physical property and water holding capacity of 30-year-old different densities of Pinus elliot-tii plantation in the source area of Ganjiang River were researched. Results indicated that soil bulk density incr-eases with the increase in soil depth for all the forests; the total soil porosities of P. elliottii plantation with di-fferent densities vary from43.83% to 68.75%. The soil maximum average water- preserving capacity, average capillary preserving water capacity and average noncapillary-preserving water capacity of P. elliottii plantation with different densities from high to low were 2 500plants/hm^2（1 300.39, 909.10 and 392.29 t/hm^2） 2 125 plants/hm^2（1 226.16, 903.97 and 322.19 t/hm^2） 2 000 plants/hm^2（1077.72, 795.07 and 282.66 t/hm^2）1 625 plants/hm^2（1 017.22, 811.38 and 205.84 t/hm^2）. The laws of profile and seasonal changes of soil water preserving capacity and time filed the exponential function Y=a·e-bx.
出处
《南方林业科学》
2015年第6期49-52,共4页
South China Forestry Science
基金
国家科技支撑计划项目"鄱阳湖生态经济区建设生态环境保护关键技术研究及示范"子课题"人工针叶林结构优化技术集成研究"(编号:2012BAC11B05-1)
江西省林业财政重大专项"鄱阳湖流域"五河"及东江源头杉木低效林改造技术集成与示范"(编号:2011510102)
关键词
湿地松
不同密度
水源涵养
土壤持水量
Pinus elliottii
different densities
water conservation
water-preserving capacity of soil
