干旱区生态环境知识资源中心(Arid): 茂兰喀斯特森林自然保护区凋落叶分解动态

Arid

	茂兰喀斯特森林自然保护区凋落叶分解动态
其他题名	Decomposition Dynamics of Leaf Litters in Maolan Karst Forest Natrue Reserve
	窦百强 1; 容丽 1; 俞国松 2; 李恒 1
来源期刊	水土保持通报
ISSN	1000-288X
出版年	2019
卷号	39 期号:2 页码:94-100
中文摘要	[目的]研究喀斯特森林生态系统凋落叶分解特征,为喀斯特森林区石漠化防治及水土保持提供科学依据。[方法]采用1 mm网孔孔径分解袋,对茂兰喀斯特森林自然保护区不同树种凋落叶(落叶和常绿叶)在不同坡位的分解状况进行为期18个月的观测研究。研究茂兰喀斯特森林自然保护区凋落叶失重率和干重残留率动态变化、分解速率及养分释放特征。[结果]凋落叶分解过程呈现快慢快的周期变化,春夏季分解速度快于秋冬季,落叶树种凋落叶分解速度快于常绿树种凋落叶,不同坡位凋落叶的分解速度表现为:下坡>中坡>上坡。利用Olson模型对凋落叶分解50%和95%所需时间进行估测,发现落叶树种凋落叶分解50%和95%所需时间分别为0.95~1.66a和4.13~7.19a,常绿树种凋落叶分解50%和95%所需时间分别为1.14~1.69a和4.92~7.30a,二者无显著性差异。凋落叶分解速率低于中亚热带东部常绿阔叶林和常绿落叶阔叶混交林,但比同区域喀斯特次生林与人工林高。落叶树种凋落叶和常绿树种凋落叶的N元素释放模式为富集释放模式,C含量随分解时间的波动差异显著,总体在不断减少,而C/N比呈逐步下降的趋势。[结论]由于不同树种凋落叶初始养分含量和叶片理化结构的差异,落叶比常绿叶具有更快的分解速率和养分释放速率,对促进喀斯特森林生态系统物质循环起着积极作用。
英文摘要	[Objective]The characteristics of litter decomposition in karst forest ecosystems were studied in order to provide scientific basis for prevention and control of rocky desertification and soil and water conservation in karst forest natrue reserve.[Methods]By using 1 mm mesh pore decomposition bag,the decomposition dynamics of different tree species of leaf litters(deciduous and evergreen leaf)in different slope position for 18 months were analyzed,including the dynamic change of litter loss rate and dry weight residue rate,decomposition rate and nutrient release characteristics of Maolan Karst Forest Natrue Reserve.[Results]The decomposition process of litter showed afast-slow-fastcycle,and the decomposition rate in spring and summer was faster than that in autumn and winter.The decomposition rate of deciduous tree litter was faster than that of evergreen tree litters,and the decomposition rate of litters on different slopes was characterized by downhill>mid slope>uphill.This study used the Olson model to estimate the time of decomposition of 50%and 95%leaf litters.The time required for decomposing 50%and 95%of deciduous tree litter is 0.95~1.66a and 4.13~7.19a,respectively.The time required for decomposing 50% and 95% of evergreen tree litter is 1.14~1.69a and 4.92~7.30a,respectively.The difference between them is not significant.The decomposition rate of leaf litter in the Maolan karst forest was lower than that of the evergreen broad-leaved forest and evergreen-deciduous broad-leaved mixed forest in the eastern subtropical zone,but higher than that of the karst secondary forest and plantation in the same region.The release pattern of N element in deciduous and evergreen leaves is enrichment-release mode,and the C content varies significantly with the decomposition time.The overall trend of C content is reduced,so the C/N ratio is decreasing.[Conclusion]Due to the difference of initial nutrient content and leaf physical and chemical structure of different tree species,deciduous leaf had faster decomposition rate and nutrient release rate than evergreen leaf,which played an active role in promoting material circulation of karst forest ecosystem.
中文关键词	茂兰喀斯特森林自然保护区 ; 凋落叶 ; 分解速率 ; 养分释放
英文关键词	Maolan Karst Forest Natrue Reserve leaf litter decomposition rate nutrient release
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6487836
来源机构	贵州师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239522
作者单位	1.贵州师范大学地理与环境科学学院, 贵阳, 贵州 550001, 中国; 2.中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 贵州 550081, 中国
推荐引用方式 GB/T 7714	窦百强,容丽,俞国松,等. 茂兰喀斯特森林自然保护区凋落叶分解动态[J]. 贵州师范大学,2019,39(2):94-100.
APA	窦百强,容丽,俞国松,&李恒.(2019).茂兰喀斯特森林自然保护区凋落叶分解动态.水土保持通报,39(2),94-100.
MLA	窦百强,et al."茂兰喀斯特森林自然保护区凋落叶分解动态".水土保持通报 39.2(2019):94-100.