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。
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.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第10期1977-1985,共9页
Chinese Journal of Ecology
基金
上海市科学技术委员会重大攻关项目(04DZ19302)
国家自然科学基金资助项目(40771013)
关键词
九段沙湿地
湿地生态系统
海三棱藤草
循环特征
Jiuduansha shoal wetland
wetland ecosystem
Scirpus mariqueter
cycling characteristics.
