摘要
对二百方子洪泛区天然湿地土壤有机质及全氮的空间分布特征进行了研究 .结果表明洪泛区养分垂直变化趋势基本一致 ,而表层水平分布差异显著 .最常遇洪水的洪泛区并不是养分含量最高的地带 ,其有机质和全氮含量分别为 2 36%和 2 60 5 4mg/kg ;而具有一定的淹水频率的洪泛区是养分含量最高地带 .一年一遇洪泛区和五年一遇洪泛区的有机质分别为 3 70 %和 3 92 % ,全氮含量 3666 4mg/kg和 31 2 5 6mg/kg ;土壤碳氮比都相对较低 ( 0～ 1 1 ) ;湿地干湿交替周期、地下潜流、植被生长特征及
The spatial distribution characteristics of soil organic matter and nitrogen in the natural floodplain wetland were studied in this paper. The results showed that the vertical distributions of nutrients in floodplain wetland were very similar, and the horizontal distribution of them in surface soil were distinctly different. The highest concentration of nutrients was not in the frequently flooded floodplain wetland where the concentrations of soil organic matter and total nitrogen were 2 36% and 2605 4mg/kg, but in the floodplain with a certain flood frequency. The concentrations of soil organic matter in the one year floodplain wetland and five year floodplain wetland were 3 70% and 3 92%, respectively; and the concentrations of total nitrogen were 3666 4mg/kg and 3125 6mg/kg, respectively. The ratios of carbon and nitrogen were relatively low. All the factors such as cycling of dry and wet, underground underset, vegetation growth and pH values etc. influenced the distribution of soil organic matter and nitrogen in wetland.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2002年第2期77-81,共5页
Environmental Science
基金
中国科学院湿地创新项目 (ZKCX 30 2 )
湖沼三期项目 (ZKHZ 0 3 0 6 )
中国科学院"百人计划"项目
关键词
洪泛区
天然湿地
有机质
氮素
空间分布
flooded area
natural wetland
organic matter
nitrogen
spacial distribution
