Advanced   Register
XTBG OpenIR  > 恢复生态学组  > 期刊论文

title: Epiphytic bryophytes as bio-indicators of atmospheric nitrogen deposition in a subtropical montane cloud forest: Response patterns, mechanism, and critical load
author: Shi, Xian-Meng;  Song, Liang;  Liu, Wen-Yao;  Lu, Hua-Zheng;  Qi, Jin-Hua;  Li, Su;  Chen, Xi;  Wu, Jia-Fu;  Liu, Shuai;  Wu, Chuan-Sheng
Issued Date: 2017
Abstract: Increasing trends of atmospheric nitrogen (N) deposition due to pollution and land-use changes are dramatically altering global biogeochemical cycles. Bryophytes, which are extremely vulnerable to N deposition, often play essential roles in these cycles by contributing to large nutrient pools in boreal and montane forest ecosystems. To interpret the sensitivity of epiphytic bryophytes for N deposition and to determine their critical load (CL) in a subtropical montane cloud forest, community-level, physiological and chemical responses of epiphytic bryophytes were tested in a 2-year field experiment of N additions. The results showed a significant decrease in the cover of the bryophyte communities at an N addition level of 7.4 kg ha(-1) yr(-1), which is consistent with declines in the biomass production, vitality, and net photosynthetic rate responses of two dominant bryophyte species. Given the background N deposition rate of 10.5 kg ha(-1) yr(-1) for the study site, a CL of N deposition is therefore estimated as ca. 18 kg N ha(-1) yr(-1). A disordered cellular carbon (C) metabolism, including photosynthesis inhibition and ensuing chlorophyll degradation, due to the leakage of magnesium and potassium and corresponding downstream effects, along with direct toxic effects of excessive N additions is suggested as the main mechanism driving the decline of epiphytic bryophytes. Our results confirmed the process of C metabolism and the chemical stability of epiphytic bryophytes are strongly influenced by N addition levels; when coupled to the strong correlations found with the loss of bryophytes, this study provides important and timely evidence on the response mechanisms of bryophytes in an increasingly N-polluted world. In addition, this study underlines a general decline in community heterogeneity and biomass production of epiphytic bryophytes induced by increasing N deposition. (C) 2017 Elsevier Ltd. All rights reserved.
Related URLs: 10.1016/j.envpol.2017.07.077
Appears in Collections:恢复生态学组_期刊论文

Files in This Item:

File SizeFormat
Epiphytic bryophytes as bio-indicators of atmospheric nitrogen deposition in a subtropical montane cloud forest_ Response patterns, mechanism, and critical load.pdf1303KbAdobe PDFView  Download

全文许可: Creative Commons 署名-非商业性使用-相同方式共享 3.0

Recommended Citation:
Shi, Xian-Meng,Song, Liang,Liu, Wen-Yao,et al. Epiphytic Bryophytes As Bio-indicators Of Atmospheric Nitrogen Deposition In A Subtropical Montane Cloud Forest: Response Patterns, Mechanism, And Critical Load[J]. Environmental Pollution,2017,229(X):932-941.

SCI Citaion Data:
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Shi, Xian-Meng]'s Articles
 [Song, Liang]'s Articles
 [Liu, Wen-Yao]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Shi, Xian-Meng]‘s Articles
 [Song, Liang]‘s Articles
 [Liu, Wen-Yao]‘s Articles
Scirus search
 Similar articles in Scirus
Related Copyright Policies
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to  Add to Digg  Add to Reddit 
所有评论 (0)
内 容:
Email:  *
验证码:   刷新
标 题:
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.



Valid XHTML 1.0!
Powered by CSpace