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森林凋落物是森林生态系统的重要组成部分,在森林生态系统的物质循环和养分平衡中起重要作用。自2012年5月开始,我们在弄岗北热带喀斯特季节性雨林15 ha森林动态监测样地中布设了90个凋落物收集器进行凋落物收集。本文选取2013–2014年期间相关数据,研究了凋落物的组分特征、物种组成、时间动态和空间分布特征等。结果表明,2013年和2014年凋落物总量分别为4,858.0 kg/ha和4,928.8 kg/ha;凋落物组分以凋落叶为主且高达85%以上,其他组分所占比例较小。凋落物总量和凋落叶均有两个高峰期,分别发生在每年的春季(3–4月)和秋冬季(8–11月),凋落果的高峰期在8月左右;其他组分由于凋落量较少,年际动态并不明显。不同生态因子对凋落物总量分布格局的影响差异显著,且存在年际变化,但总体表现出凋落物总量受凋落物收集器所在样方的坡向和样方内所有DBH≥1 cm个体的平均胸径影响最为显著。喀斯特季节性雨林凋落物的组分构成和时空动态特征反映了不同生物和非生物因素影响下的物质循环规律,为深入揭示喀斯特独特地质、地貌背景下物质循环和能量流动的特殊性提供了基础。
Forest litter is an important part of forest ecosystem and plays an important role in the material circulation and nutrient balance of forest ecosystem. Since May 2012, we collected 90 litter collectors in the 15 ha forest dynamic monitoring plots of the tropical karst rain forest in Nonggang, collecting litter. In this paper, the relevant data of 2013-2014 were selected to study the compositional characteristics, species composition, temporal dynamics and spatial distribution characteristics of litter. The results showed that the litterfall was 4,858.0 kg ha -1 and 4,928.8 kg ha -1 respectively in 2013 and 2014. The litterfall was dominated by litter and up to 85%, while the proportion of other components was small. The total amount of litterfall and litter fall had two peaks, which occurred in the spring (March-April) and autumn-winter (August-November) respectively, and the peak of litter fall was around August. The other components Less litter, interannual dynamics is not obvious. The effects of different ecological factors on litterfall distribution were significant, and there existed interannual variations, but the total litterfall was generally affected by the aspect of sampling plots and the DBH≥1 cm individuals The average breast diameter of the most significant impact. The component composition and spatio-temporal dynamic characteristics of litter in karst seasonal rain forest reflect the circulations of material under the influence of different biological and abiotic factors, which provides a basis for revealing the particularity of material circulation and energy flow under the unique karst geological and geomorphological background. .