摘要
为了检验全球变暖对森林凋落物分解的影响,在跨气候带的大尺度下进行森林凋落物的交互分解实验,在热带的尖峰岭和亚热带的鼎湖山各选样地1个,它们有相似的海拔高度、土壤类型、年均降雨量及干湿季节律,气温为主要差异,年均气温相差3 7℃。各样地分别收集了10种当地的优势树种的凋落叶.其中2个样地各自的优势种青皮和锥栗,2个样地均有的共同种荷木作为单种样。10种凋落叶的等重量混合为混合样,共计6类凋落叶,分别交互置于2个样地分解。结果表明:6类凋落叶在尖峰岭的分解速率显著地大于在鼎湖山的分解速率;凋落叶分解的表观Q10在3 7～7 5范围内。证实在这个温差范围内,凋落物分解加快的程度可达1 36～3 06倍。
In order to examine the effects of global warming on the decomposition of forest litter, an experiment was designed to decompose reciprocally forest foliar litter in two sites across climatic zones. One site was selected in Mt. Jianfengling in tropics and the other in Mt. Dinghushan in subtropics. The two sites had similar altitudes, soil types, annual mean temperature and seasonality of dry and wet. The main difference between sites was the annual mean temperature with the difference of 3.7 ℃. Foliar litters of respective 10 native dominant tree species were collected from the two sites and divided into single-species litter and mixed litter. They were decomposed reciprocally in the two sites. The results indicated that litter decomposed in the tropical site more than 1.36～3.06 times as rapidly as in the subtropical site. Apparent Q-(10), calculated on the basis of the difference of temperature between sites, ranged from 3.7 to 7.5. The conclusion was that global warming would strengthen the function of matter circulation in the subtropical forest ecosystem in China.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第4期86-89,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金重大资助项目(39899370)
广东省自然科学基金重大资助项目(980952)资助
关键词
全球变暖
热带
亚热带
叶凋落物
交互分解
global warming
tropics
subtropics
foliar litter
reciprocal decomposition
