摘要
研究种子散布的时空动态对于揭示群落更新机制和植被斑块分布格局具有重要意义。于2005～2007年在凉水自然保护区的9hm2阔叶红松林永久样地的中心地带(150m×150m),设置287～319个种子接收器(面积为0.5m2,网口位于离地面1m处),定期收集并鉴定其中的种子。结果表明:(1)乔木树种的种子雨强度在不同的年份间存在差异,由2005年到2007年逐年递减(分别为(864.2±1084.3)粒·m-2、(300.9±349.4)粒·m-2和(144.8±195.5)粒·m-2)。11个树种均表现出了年际间的差异,一些树种如水曲柳、糠椴、白桦、红皮云杉、冷杉在某一年份结实量很小或几乎不结实,而红松受人为干扰较大。(2)种子散布存在明显的季节变化,从5月份到11月份均收集到了各树种的种子,且种子雨在10月达到高峰,11月中旬基本结束,但不同的树种的时间变化形式不同。高峰期,种子雨以完整种子为主;而在这之前的种子雨主要以未成熟种子为主。(3)种子雨的构成在各年份间保持稳定。(4)变异函数分析表明,在不同的年份种子雨空间异质性不同,而空间异质性与种子雨强度呈正相关。
Spatiotemporal dynamics of seed rain is important for understanding community regeneration mechanisms and vegetation patches distribution patterns. We established 287 -319 seed traps in a 150m × 150m sample plot of the 9-ha permanent plot to collect and identify fallen seeds from 2005 to 2007 in a broadleaved-Korean pine（ Pinus koraiensis） mixed forest at Liangshui Natural Reserves. The results showed that ： （ 1 ） The intensity of seed rain for tree species had a great interannual variation, （864.2 ±1084.3 ）, （300.9 ±349.4）, （ 144.8 ± 195.5 ） inds m^-2, in 2005, 2006 and 2007, respectively. The intensity of seed rain of the 11 tree species included also showed a great interannual variation, and the density of Fraxinus mandshurica, Tilia manddhurica, Betula platyphylla, Picea koraiensis and Abies nephrolepis in certain years was little. However, the intensity of Pinus koraiensis was influenced by human disturbance. （2） Seasonal dynamics of the seed rain were significant. The seed rain started in May, reached a peak in October, and ended in the middle of November. But the temporal pattern of each tree species was different. From the peak of the seed rain phase, the seed rain was mainly made up by intact seeds, but at the beginning the seed rain was mainly by vacant seeds. （3） The seed rain components were stable among years. （4） The spatial heterogeneity of the seed rain varied among years, and it was positively correlated to the intensity of seed rain.
出处
《生态学报》
CAS
CSCD
北大核心
2008年第11期5731-5740,共10页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(No.30770350)
黑龙江省自然科学基金重点资助项目(No.ZJN0706)
国家林业科技支撑计划资助项目(No.2006BAD03A0702)~~
关键词
阔叶红松林
种子雨
时空动态
Broadleaved-Korean pine mixed forest
seed rain
spatiotemporal dynamics
