两种树叶在华南地区陆地与水环境中的分解速率比较

利用粗细2种孔径的分解袋对两种树叶(蒲桃和白兰)在广州长岗山自然保护小区的陆地和池塘中分别进行了为期210d和60d的分解研究.在陆地环境中,蒲桃在粗细网袋中的分解速率分别为0.003318d^-1和0.003728d^-1,白兰在粗细网袋中的分解速率分别为0.009238d^-1和0.004379d^-1;在静水环境中,蒲桃在粗细网袋中的分解速率分别为0.009536d^-1和0.012591d^-1,白兰在粗细网袋中的分解速率分别为0.017949d^-1和0.020759d^-1.结果表明,两种树叶在陆地中的分解速率均慢于水环境.另外,由于富含丹宁的蒲桃叶片具有抑菌作用,因此,无论在陆地还是水环境,蒲桃树叶的分解速率均慢于白兰树叶.

Comparison of breakdown rates of two species of leaf litter at terrestrial and aquatic environments in the southern China

We researched the decomposition of leaves of Syzygium jambos and Michelia alba allocated into coarse and fine mesh bags in terrestrial habitat(210 d) and pond(60 d) at the Changgangshan Nature Reserve,Guangzhou.The breakdown rates of S.jambos in coarse and fine mesh bags were 0.003 318d^-1 and 0.003728d^-1,while those of M.alba litter were 0.009238d^-1 and 0.004379d^-1,respectively,in terrestrial environment.In lentic environment,the breakdown rates of S.jambos in coarse and fine mesh bags were 0.009 536d^-1 and 0.012 591d^-1,while those of M.alba litter were 0.017 949d^-1 and 0.020 759d^-1, respectively,indicating that the leaf litter decomposition rates of the two species were lower in terrestrial habitat than in lentic environment.Furthermore,the decomposition rates of S.jambos were lower than those of M.alba both in terrestrial habitat and in lentic environment,mainly due to its high content of polyphenols which can inhibit the growth of microbes.