Effects of Salinity and Nutrient Addition on Mangrove Excoecaria agallocha

被引：45

作者：

Chen, Yaping ^{[1
]}

Ye, Yong ^{[1
]}

机构：

[1] Xiamen Univ, Coll Environm & Ecol, Minist Educ Coastal & Wetland Ecosyst, Key Lab, Xiamen, Fujian, Peoples R China

来源：

PLOS ONE | 2014年 / 9卷 / 04期

基金：

中国国家自然科学基金;

关键词：

VS. PHOSPHORUS LIMITATION; AVICENNIA-MARINA; KANDELIA-CANDEL; SALT TOLERANCE; SPARTINA-ALTERNIFLORA; RHIZOPHORA-STYLOSA; LEAF DEMOGRAPHY; SODIUM-CHLORIDE; GROWTH; RESPONSES;

D O I：

10.1371/journal.pone.0093337

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Effects of salinity on seed germination and growth of young (1 month old) and old (2-year old) seedlings of Excoecaria agallocha were investigated. Combined effects of salinity and nutrient level were also examined on old seedlings. Seed germination was best at 0 and 5 psu salinity. 15 psu salinity significantly delayed root initiation and decreased final establishment rate. All seeds failed to establish at 25 psu salinity. Young seedlings performed best at 0 and 5 psu, but growth was stunned at 15 psu, and all seedlings died within 90 days at 25 psu. Old seedlings grew best at salinities below 5 psu and they survived the whole cultivation at 25 psu. This indicated that E. agallocha increased salt tolerance over time. Gas exchange was significantly compromised by salinities above 15 psu but evidently promoted by high nutrient. Proline accumulated considerably at high nutrient, and its contents increased from 0 to 15 psu but decreased at 25 psu salinity. Lipid peroxidation was aggravated by increasing salinity beyond 15 psu but markedly alleviated by nutrient addition. These responses indicated that E. agallocha was intolerant to high salinity but it can be greatly enhanced by nutrient addition.

引用

页数：11