热带亚热带植物学报Issue(6)：549-557,9.DOI:10.11926/j.issn.1005-3395.2014.06.002
模拟降水分配季节变化对南亚热带常绿阔叶林凋落物的影响
Effects of Seasonal Precipitation Variation on Litter-fall in Lower Subtropical Evergreen Broad-leaved Forest
摘要
Abstract
In order to understand the effects of precipitation pattern on litter-fall in lower subtropical evergreen broad-leaved forest, a field precipitation manipulation experiment at Heshan National Forest Research Station (Guangdong Province, China) was designed to simulate decreasing dry-season (October–March) and spring (April–May) rainfall and the litter-fall respones in the forest was studied. The results showed that annual litter-fall of the experimental forest was 9.24 t hm–2, of which leaf litter was the main composition at different stages, accounting for 50.7%–69.3% of the total. The decreasing dry-season rainfall (DD) treatment significantly reduced leaf litter production (P<0.01). The whole-year litter production was also reduced by 10.3% under the DD treatment compared to the control, but not statistically significant. Decreasing spring rainfall (ED) also reduced flower-, fruit-, and leaf-litter as well as the total during the spring time, but the whole-year litter production was increased by 11.3% compared to the control. No statistically signiifcant difference of ED effects on the spring and whole-year litter production was found. Neither DD nor ED treatments had obvious impacts on the quality of leaf litter, but DD treatment signiifcantly reduced lignin content in leaf litter ofMichelia macclurei(P<0.05). Therefore, the changes in precipitation pattern could inlfuence the soil carbon sink in the lower subtropical forests of China.关键词
降水格局/干旱/凋落物/南亚热带常绿阔叶林Key words
Precipitation pattern/Drought/Litter-fall/Evergreen broad-leaved forest引用本文复制引用
焦敏,申卫军..模拟降水分配季节变化对南亚热带常绿阔叶林凋落物的影响[J].热带亚热带植物学报,2014,(6):549-557,9.基金项目
国家自然科学基金重点项目(31130011) （31130011）
广东省自然科学基金重点项目(S2012020011084)资助 （S2012020011084）
