摘要
为探讨全球气候变化背景下极端气候事件对哀牢山中山湿性常绿阔叶林森林凋落物量的影响,将正常年份的凋落物量与受极端气候事件影响年份的凋落物量进行对比分析,以明确极端气候事件对凋落物年总量与月动态的影响和凋落物量与气候因素的关系。结果显示:(1)极端气候事件对年凋落物量具有显著性影响,受极端气候事件影响年份的年平均凋落物量为795.74 g·m^(-2),较正常年份的年平均凋落物量(607.57 g·m^(-2))增加了31%。受极端气候事件影响的年凋落物量呈增加趋势。年凋落物主要由枯叶和枯枝所组成,之后依次为杂物、落花(果),树皮与苔藓地衣最少。干旱对年凋落物组分比例影响较小,而雪灾造成枯枝占比提高。(2)极端气候事件对月凋落物量具有显著影响。各年份凋落物月动态均表现为单峰模式。2010年和2020年(干旱)的旱季凋落物量分别为340.51 g·m^(-2)与327.05 g·m^(-2),较正常年份(226.38 g·m^(-2))增加了50.4%和44.5%,其中,叶凋落量增加最多,其次为枝凋落量,其余组分变化不明显。2015年1月(雪灾)的月凋落物量为263.50 g·m^(-2),较正常年份的1月凋落物量(31.15 g·m^(-2))大幅增加,其中,枝凋落量增加最多,其次是叶凋落物量,其余组分均少量增加。(3)总体来说,月凋落物量与月降水量和月平均相对湿度呈显著负相关,与月平均地面温度和月平均风速无显著相关性。在极端气候事件发生年份,月凋落物量与月降水量、月平均地面温度、月平均相对湿度、月平均风速均无显著相关性。
To explore the effects of extreme climatic events on litter of forests in the context of global climate change,the monthly dynamics of apoplastic litter recovery in mid-mountain humid evergreen broad-leaved forests in the Ailao Mountains were analyzed for the years 2010 and 2015-2020.The litter in normal years was compared and analyzed with the litter in the years affected by extreme climatic events,in order to clarify the effects of extreme climatic events on the annual total volume and monthly dynamics of litter and the relationship between litter and climatic factors.The results showed that:(1)The extreme climatic event has a significant effect on the annual litter,and the average annual litter in the year affected by the extreme climatic event is 795.74 g·m^(-2),which is 31%higher than that in the normal year.The annual litter affected by extreme climatic events shows an increasing trend.The annual litter is mainly composed of dead leaves and twigs,followed by debris,fallen flowers(fruits),and the bark and moss lichens are the least.Drought has little effect on the annual litter fraction,while snowstorms causes an increase in the proportion of dead branches.(2)Extreme climatic events have a significant effect on monthly litter.Monthly dynamics of apoplastic matter in all years shows a single-peak pattern.The amount of dry season litter increase in all dry years compared with normal years,of which,leaf litter increases the most,followed by branch litter,and the rest of the components do not change significantly.Monthly litter in the months of snowstorms increases substantially compared to normal years,with branch litter increasing the most,followed by leaf litter,and the rest of the components increasing in small amounts.(3)Generally,monthly litter is negatively correlated with monthly precipitation and monthly mean relative humidity,and not significantly correlate with monthly mean ground temperature and monthly mean wind speed.In extreme climatic event years,monthly litter is not significantly correlated with monthly precipitation,monthly mean ground temperature,monthly mean relative humidity,and monthly mean wind speed.
作者
徐晨展
鲁志云
刘婷婷
XU Chenzhan;LU Zhiyun;LIU Tingting(Southwest Forestry University,Kunming Yunnan 650224,P.R.China;Ailaoshan Station of Subtropical Forest Ecosystem Studies,Jingdong Yunnan 676200,P.R.China;Yunnan Key Laboratory of Plateau Wetland Conservation,Restoration and Ecological Services,Kunming Yunnan 650233,P.R.China)
出处
《西部林业科学》
CAS
北大核心
2024年第5期32-39,共8页
Journal of West China Forestry Science
基金
云南省农业基础研究联合专项(202301BD070001-094)。
关键词
凋落物量
极端气候事件
月动态
哀牢山
中山湿性常绿阔叶林
litter
extreme climatic event
monthly dynamics
Ailao mountain
Mid-mountain humid evergreen broad-leaved forest
