摘要
在固定样地采用凋落物收集器收集并定期回收凋落物的方法,研究了海南岛北部海岸木麻黄防护林2008—2009年的凋落物产量及N、P、K养分归还动态.结果表明:(1)木麻黄林年凋落物量为5.984 4 t/hm2,其中小枝凋落物量在年凋落量中占有最大比例,为88.99%;其次是杂物,为6.63%;最小是皮+枝,为4.38%.木麻黄林总凋落物量和小枝凋落物量的月变化格局十分相似,皮+枝、杂物凋落物量月动态变化则比较平缓.(2)小枝中N、P、K 3种主要养分年归还总量为94.69 kg/hm2,其中N归还量在年归还量中占有最大比例,为78.86%;其次是K,为18.71%;最小是P,为2.43%.N归还量月动态与总凋落物量月动态变化极其相似,P、K归还量月动态则比较平缓.
In order to explore the characteristics of nutrient cycle in the plantation in ＂coastal region in Hainan Is-land, we studied the litter production and nutrient return of Casuarina equisetifolia plantation on the coast of northHainan Island through monthly collection of litter from litter traps in fixed sampling plots during 2008 -2009. Theresults showed that the annual litter biomass of C. equisetifolia plantation was 5. 984 4 t,/hm^2. The needle litter tookup the largest percentage （88. 99%）. The miscellaneous litter took the second place （6. 63%）. And the bark ＋branch litter took the least percentage （4. 38%）. The monthly dynamic of needle litter was similar to the total lit-ter, but the monthly dynamics of bark ＋ branch and miscellaneous litter were slow. The annual return of three mainnutrients （N, P and K） from the needle litter was 94. 69 kg/（ hm^2·a） in total. The percentage in the annual re-turn of N, P and K was 78.86%, 2. 43% and 18.71%, respectively, with the sequence of N 〉 K 〉 P.
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2012年第2期123-128,共6页
Journal of South China Normal University(Natural Science Edition)
基金
中国科学院知识创新工程项目(KZC2-407)
英国皇家学会资助项目(LJC/China/2005R1/Liu)
关键词
木麻黄
凋落物
养分归还
海南岛北部
Casuarina equisetifolia
litter
nutrient return
north Hainan Island
