土壤养分变化对鄱阳湖湿地植物叶片氮磷及其化学计量关系的影响

生态学杂志

土壤养分变化对鄱阳湖湿地植物叶片氮磷及其化学计量关系的影响

钟欣孜^1,2,吴琴^1,2,崔浩^1,2,冯哲^1,2,胡启武^1,2*

（¹江西师范大学鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022；²江西师范大学地理与环境学院，南昌 330022）

出版日期:2018-10-10 发布日期:2018-10-10

Effects of soil nutrients on leaf N, P and N∶P stoichiometry in Poyang Lake wetlands.

ZHONG Xin-zi^1,2, WU Qin^1,2, CUI Hao^1,2, FENG Zhe^1,2, HU Qi-wu^1,2*

(¹Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China; ²School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China).

Online:2018-10-10 Published:2018-10-10

摘要/Abstract

摘要： 在鄱阳湖湿地典型分布区采集常见植物的叶片与根际土壤样品，以探讨土壤养分变化对湿地植物叶片氮磷含量及其化学计量关系的影响。结果表明：鄱阳湖湿地植物叶N含量变化范围为4.98～52.29 g·kg^-1，平均值为(21.71±8.99) g·kg^-1；叶P含量波动范围为0.44～3.02 g·kg^-1，平均值为(1.38±0.53) g·kg^-1；N∶P平均值为(17.19±8.23)；叶片N、P含量受土壤P含量的影响显著，对土壤P含量的变化较N更敏感；叶片N∶P化学计量关系具有稳定性特征，不随土壤N、P养分变化而产生显著差异，且叶片NP线性关系在不同土壤养分环境下没有发生策略位移现象。

关键词: 50%初次性成熟叉长(L₅₀), 增殖放流, 效果评估, 大麻哈鱼

Abstract: To examine the effects of soil nutrients on leaf nitrogen (N), and phosphorus (P), and N∶P stoichiometry in Poyang Lake wetlands, we collected leaf and rhizospheric soil samples and analyzed N and P concentrations. Results showed that leaf N concentration ranged from 0.44 to 3.02 g·kg^-1, with an average of 21.71±8.99 g·kg^-1. Leaf P concentration varied from 0.44 to 3.02 g·kg^-1, with an average of 1.38±0.53 g·kg^-1. The mean of foliar N∶P ratio was 17.19±8.23, suggesting that P, rather than N availability, mainly limited plant growth in Poyang Lake wetlands. Moreover, leaf N and P concentrations were more sensitive to changes in soil P availability rather than soil N availability. Leaf N∶P stoichiometry was well constrained in Poyang Lake wetlands, in that variation in soil N and P did not alter foliar N∶P. In addition, the signi ficantly positive correlations between leaf N and P concentrations were found in various soil nutrient environments. The relationship between N and P in leaves did not shift with the changes of soil nutrients.

Key words: Oncorhynchus keta, fork length at 50% of individuals reached sexual maturity (L₅₀), effect assessment, enhancement release

钟欣孜,吴琴,崔浩,冯哲,胡启武. 土壤养分变化对鄱阳湖湿地植物叶片氮磷及其化学计量关系的影响[J]. 生态学杂志.

ZHONG Xin-zi, WU Qin, CUI Hao, FENG Zhe, HU Qi-wu. Effects of soil nutrients on leaf N, P and N∶P stoichiometry in Poyang Lake wetlands.[J]. cje.

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