作　　者： ; ; ; ; ;

机构地区： 华南农业大学林学院

出　　处： 《西南林学院学报》 2011年第4期18-23,共6页

摘　　要： 应用样方调查法,研究冰灾后粤北常绿阔叶林粗死木质残体(coarse woody debris,CWD)的组成和结构特征,比较不同坡向林分的CWD存在形式、种类组成、径级结构、样方分布以及腐烂等级状态。结果表明:冰灾后迎风坡林分的CWD贮量为14.81 t/hm2,明显高于背风坡林分5.66 t/hm2的CWD贮量;且不同坡向林分的CWD存在形式有较大的差异,迎风坡林分中CWD存在形式以倒木为主,而背风坡林分则以枯立木为主;倒木的分解速度较快,主要处于中度分解状态,而大多数枯立木则处于轻度分解状态;迎风坡林分大径级树种由于积雪作用,形成大量倒木;而背风坡林分小径级树种受低温冻害的影响,大量枯萎死亡。冰灾引起的CWD剧增会严重影响森林演替的进程,其中倒木对森林生态系统结构和功能短期的调节作用比较明显,而枯立木对森林生态系统的影响是一个长期的过程,有必要对其进行长期量化研究。 The composition and structure of the coarse woody debris（CWD） in the evergreen broadleaved forest after ice storm in northern Guangdong Province were studied by means of plot survey to compare the CWD existence form,species composition,DBH structure,and the CWD decay status of the forest stands at different aspects of the hills.The results showed that the CWD storage in the windward stand was 14.81 t/hm2,which was significantly higher than that of in the leeward stand（5.66 t/hm2） after the ice storm.There was great difference in the CWD existence form in stands at the different aspects.The CWD in the windward stands was mainly in the form of fallen logs,whereas the CWD in the leeward stands was mainly in the form of snags.The decay rate of fallen logs was much faster than that of the snags,so the former was principally in the moderately decomposed state,while the latter was mainly in the slightly decomposed state.The trees in large DBH classes in the windward stands accumulated a lot of ice,and then fell onto the ground became fallen logs,but the trees in small DBH classes in the leeward stands were killed by the low temperature and became the snags.The significant increase of CWD caused by the ice storm would have severely altered the forest structure and ultimately changed the succession process of the forest ecosystem.The fallen logs could apparently impact on the structure and function of forest ecosystems in a short-term.However,the impact of the snags on the forest ecosystems would be a long term process,which requests long term quantitative research along the course.

关 键 词： 冰灾 粗死木质残体 贮量 腐烂等级

领　　域： [农业科学] [生物学]