不同梯度氮沉降对亚热带甜槠林凋落物及养分的影响

doi:10.13961/j.cnki.stbctb.2016.05.027

CORC > 北京大学 > 城市与环境学院

	不同梯度氮沉降对亚热带甜槠林凋落物及养分的影响; Effects of Nitrogen Deposition on Litterfall and Its Nutrient in Subtropical Evergreen Broad-leaved Castanopsis Ey rei Forest
	徐俊 ; 李茂 ; 刘露 ; 田地 ; 徐小牛
刊名	水土保持通报
	2016
关键词	常绿阔叶林凋落物量模拟氮沉降养分归还量 evergreen broad-leaved forest litterfall production simulated nitrogen deposition nutrient return
DOI	10.13961/j.cnki.stbctb.2016.05.027
英文摘要	[目的]分析不同梯度氮沉降作用下亚热带常绿阔叶甜槠（Castanopsis eyrei）林凋落物量及养分变化规律，从而为亚热带地区氮沉降研究提供数据参考与理论依据。[方法]对安徽省仙寓山地区设置不同梯度施氮对照试验，长期实地监测甜槠林凋落物量及其养分的响应状况。[结果]凋落物量大小顺序为：高氮加磷（HN＋ P）＞低氮（LN）＞高氮（HN）＞对照CK ，不同处理间的差异未达到显著水平；但是落叶量LN与CK之间差异显著（p＝0．023）。各处理凋落物量的月变化模式均呈双峰型，分别在4和11月达到峰值；凋落物中各组分所占比例从大到小均为：叶＞果＞枝＞碎屑＞花＞皮；施肥处理不同程度上改变了落果量的比重：HN＋ P（27％）＞ HN（25％）＞ CK＝ LN（23％）。甜槠林C ，N ，P ，K ，Ca ，Mg 这6种大量元素的养分年归还量共计：HN＋ P 4．62 t／（hm2· a）＞ CK 4．44 t／（hm2· a）＞ HN 4．17 t／（hm2· a）＞LN 3．96 t／（hm2· a）；不同处理各养分（K除外）归还量均表现为上述关系，且 HN＋ P与CK之间的N ，P的养分归还量差异显著（ p＝0．047；0．023）。对于各组分而言，落叶的养分归还量占年养分归还量的52％～58％。[结论]模拟不同梯度的氮沉降处理在一定程度上改变了甜槠林凋落物总量的大小及其组成比例，且影响到其他养分的吸收及归还量。; Objective] This essay provided data reference and theoretical basis for nitrogen deposition in sub‐tropical regions by analyzing effects of nitrogen deposition on litterfall and its nutrient in a subtropical ever‐green broad‐leaved Castanopsis eyrei forest .[Methods] Different gradient nitrogen control experiments were set up in Xianyu mountain area of Anhui Province to monitor C .eyrei forest litterfall and nutrient response status for a long time .[Results] The order of the annual litterfall were as follows :high nitrogen and phos‐phorus(HN+P)>low nitrogen(LN)> high nitrogen(HN)> control check(CK) .There was no significant difference among the treatments .There was significant difference in foliar litter between LN and CK treat‐ments(p=0 .023) .The total litterfall showed a bimodal type with the peaks appeared in April and Novem‐ber .The order of the proportion of the different litter components for the four treatments ranked as leaf >fruit>branch>miscellaneous>flower>bark .HN+ P and HN treatments changed the fruit percentage to a certain degrees :HN+P(27% )> HN(25% )>CK= LN (23% ) .The annual amount of total nutrient‐returns of the six macro‐elements(C ,N ,P ,K ,Ca ,Mg) was as follows :HN+P 4.62 t/(hm2 · a)>CK 4 .44 t/(hm2 · a)> HN 4 .17 t/(hm2 · a)>LN 3 .96 t/(hm2 · a) .The similar patterns appeared for C ,N ,P ,Mg ,Ca returns in the four treatments .There was significant differences in annual returns of N and P between HN + P and CK treatments(p= 0 .047;p= 0 .023) . The nutrient return from foliar litter covered 52% ~58% of the annual total .[Conclusion] We simulated different gradient of nitrogen settlement and found that it changed the C . eyrei forest total litter amount and composition proportion in a certain extent and affected the absorption of other nutrients and return amount .; 国家自然科学基金项目“不同林龄序列亚热带常绿阔叶林地下碳氮耦合循环特点”(31370626)；国家“973”计划项目“中国典型生态系统碳循环主要过程及其碳源汇机制”; 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 5; 113-118; 36
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/478377]
专题	城市与环境学院
推荐引用方式 GB/T 7714	徐俊,李茂,刘露,等. 不同梯度氮沉降对亚热带甜槠林凋落物及养分的影响, Effects of Nitrogen Deposition on Litterfall and Its Nutrient in Subtropical Evergreen Broad-leaved Castanopsis Ey rei Forest[J]. 水土保持通报,2016.
APA	徐俊,李茂,刘露,田地,&徐小牛.(2016).不同梯度氮沉降对亚热带甜槠林凋落物及养分的影响.水土保持通报.
MLA	徐俊,et al."不同梯度氮沉降对亚热带甜槠林凋落物及养分的影响".水土保持通报 (2016).