长江河口九段沙海三棱藨草湿地生态系统N、P、K的循环特征

生态学杂志 ›› 2009, Vol. 28 ›› Issue (10): 1977-1985.

长江河口九段沙海三棱藨草湿地生态系统N、P、K的循环特征

杨永兴¹;刘长娥^1,2;杨杨³

¹同济大学环境科学与工程学院污染控制与资源化国家重点实验室,长江水环境教育部重点实验室,上海 200092；²上海农业科学院生态环境保护研究所,上海201106； ³同济大学生命科学与技术学院,上海 200092

出版日期:2009-11-10 发布日期:2009-11-10

Characteristics of N, P and K cycling in Scirpus mariqueter wetland ecosystem at Jiuduansha shoal of Yangtze River estuary.

YANG Yong-xing¹;LIU Chang-e^1,2;YANG Yang³

¹Key Laboratory of Yangtze River Water Environment, Ministry of Education, State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Shanghai 200092, China;²Institute of Ecological Environment Protection, Shanghai Academy of Agricultural Science, Shanghai 201106, China;³School of Life Science and Technology, Tongji University, Shanghai 200092, China).

Online:2009-11-10 Published:2009-11-10

摘要/Abstract

摘要： 研究了九段沙海三棱藨草湿地生态系统的营养元素（N、P、K）的含量特征、分布规律与循环特点。结果表明：随下沙中沙上沙海拔高程依次缓慢上升，土壤全剖面中P、K含量逐渐下降，N含量不受海拔高程影响。土壤剖面全量养分TN平均含量排序为：中沙＞下沙＞上沙；TP与TK排序均为：下沙＞中沙＞上沙。速效性养分AN含量排序为：中沙＞下沙＞上沙，AP与AK排序均为：下沙＞中沙＞上沙。土壤全量与速效性养分排序分别为：TK＞TP＞TN、AK＞AN＞AP。随土壤剖面深度增加，营养元素含量呈减少趋势。土壤剖面营养元素分布显示N、K的表聚性比P明显。上沙、中沙与下沙海三棱藨草湿地植物K和N的吸收量均大于P。海三棱藨草对土壤营养元素的吸收量排序上沙和下沙均为：K＞N＞P；中沙为：N＞K＞P。上沙海三棱藨草吸收营养元素总量最多，中沙其次，下沙最少。各沙洲海三棱藨草湿地生态系统的营养元素吸收系数排序为：N＞P＞K；循环系数排序为：K＞N＞P。上沙海三棱藨草湿地生态系统N的利用系数最大，中沙和下沙湿地生态系统K的利用系数最大。

关键词: 沙漠化, 沙质草原, 共有种群, 抗氧化酶

Abstract: An investigation was made on the contents, distribution patterns, and cycling characteristics of N, P and K in Scirpus mariqueter wetland ecosystem at the upper, middle, and lower Jiuduansha shoals of Yangtze River estuary. With the increasing altitude along the gradient lower shoal  middle shoal  upper shoal, the P and K contents in the whole soil profile decreased, while N content had less variation. The total N (TN) content in the soil profile was in the order of middle shoal > lower shoal > upper shoal, total P (TP) and total K (TK) contents were lower shoal > middle shoal > upper shoal, available N (AN) content was middle shoal > lower shoal > upper shoal, and available P (AP) and K (AK) contents were lower shoal > middle shoal > upper shoal. The contents of soil total and available N, P, and K were in the order of TK > TP > TN, and AK > AN > AP, respectively, and decreased with soil depth. N and K were more accumulated in surface soil, and the absorbed amounts of N and K by S. mariqueter at the three shoals were higher than that of P. The absorbed amount of soil nutrients by S. mariqueter at upper and lower shoals was in the order of K > N > P, and that at middle shoal was N > K > P. The S. mariqueter at upper shoal absorbed the highest amount of soil nutrients, followed by that at middle shoal, and at lower shoal. The absorption coefficient of nutrients in S. mariqueter wetland ecosystem at the three shoals was N > P > K, and cycling coefficient was K > N > P. The N at the upper shoal and the K at the middle and lower shoals had the highest utilization coefficient.

Key words: Desertification, Sandy grassland, Common plant population, Anti-oxidative enzymes

杨永兴 ;刘长娥;杨杨. 长江河口九段沙海三棱藨草湿地生态系统N、P、K的循环特征[J]. 生态学杂志, 2009, 28(10): 1977-1985.

YANG Yong-xing;LIU Chang-e;YANG Yang. Characteristics of N, P and K cycling in Scirpus mariqueter wetland ecosystem at Jiuduansha shoal of Yangtze River estuary.[J]. cje, 2009, 28(10): 1977-1985.

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