鄱阳湖湿地优势植物氮磷再吸收

生态学杂志

鄱阳湖湿地优势植物氮磷再吸收

郭超¹,蔡家艳¹,金奇¹,周红艳¹,李敏¹,胡启武^1,2*

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

出版日期:2016-03-10 发布日期:2016-03-10

Nitrogen and phosphorus resorption of six dominant plant species in Poyang Lake wetlands.

GUO Chao¹, CAI Jia-yan¹, JIN Qi¹, ZHOU Hong-yan¹, LI Min¹, HU Qi-wu^1,2*

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

Online:2016-03-10 Published:2016-03-10

摘要/Abstract

摘要： 于植物生长旺盛期与末期，在鄱阳湖南矶湿地国家级自然保护区分别采集6种优势植物成熟叶片与衰老叶片进行N、P含量测定，以探讨鄱阳湖湿地优势植物的N、P养分再吸收特征。结果表明：6种植物N、P元素的再吸收效率变化范围分别为8.2%～46.6%和18.9%～44.5%，其中，灰化苔草在所有物种中N、P再吸收效率均表现为最低。挺水植物的N、P平均再吸收效率分别为41.3%和38.5%，明显高于湿生植物的N、P平均再吸收效率的19.9%和26.0%。6种植物N、P养分再吸收效率均与成熟叶片的N、P养分含量呈显著正相关，且N再吸收效率与成熟叶片N∶P值呈显著正相关。依据养分再吸收指标来判断，鄱阳湖湿地6种优势植物均属于N再吸收能力较弱的物种。

关键词: 养分吸收, 替代钾肥, 水稻, 烟杆还田, 烟杆钾

Abstract: In this study, six dominant plant species, including Phragmites australis, Triarrhena lutarioriparia, Zizania latifolia, Carex cinerascens, Carex Argyi and Polygonum hydropiper, were selected in Nanji Wetlands National Nature Reserve in Poyang Lake. Subsequently, mature and senescent leaves were sampled for analyzing N and P concentrations at biomass peaking and the end of growing season, respectively. The objective of this study was to clarify the characteristics of N and P resorption of the six dominant plant species in Poyang Lake wetlands. The results showed that the N resorption efficiency (NRE) of the six plant species ranged from 8.2% to
46.6%, whereas the P resorption efficiency (PRE) varied from 18.9% to 44.5%. Among the six plant species, C. cinerascens had the minimum NRE and PRE. Moreover, the mean NRE and PRE were 41.3% and 38.5% for emergent plants, but 19.9% and 26.0% for hydromorphic plants, respectively. NRE and PRE were positively correlated with N and P concentrations in mature leaves. In addition, NRE was positively correlated with N∶P ratio in mature leaves. According to their nutrient resorption proficiency, the six plant species in the Poyang Lake wetlands could be recognized as low N resorption plants.

Key words: straw potassium, substitute potassium, rice, nutrient absorption, tobacco straw returning

郭超1,蔡家艳1,金奇1,周红艳1,李敏1,胡启武1,2*. 鄱阳湖湿地优势植物氮磷再吸收[J]. 生态学杂志.

GUO Chao1, CAI Jia-yan1, JIN Qi1, ZHOU Hong-yan1, LI Min1, HU Qi-wu1,2*. Nitrogen and phosphorus resorption of six dominant plant species in Poyang Lake wetlands.[J]. cje.

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