摘要
通过实地调查,研究了南四湖湿地生态自然保护区香蒲对氮、磷元素的吸收与蓄积规律。结果表明:氮磷元素在香蒲体内的蓄积含量具有季节性规律,随生长发育时期的延长,香蒲组织内氮、磷均具有随季节而向上输送蓄积或向下进行"营养回流"的特点。结合香蒲资源化利用的途径,香蒲的收割方式应按照其分布特点,分区域交替收割,既要保证香蒲的正常繁殖,还要保证香蒲能够从湿地环境带出一定量的氮磷,收割期宜在10月下旬或11月份。从香蒲吸收氮磷元素的年际间对比,发现2008年度地上部较2007年度有明显的累积,香蒲具有年际间的累积特点,但在生长后期一部分营养可能转运至土壤环境,使得累积现象不明显。氮磷营养元素在植物体内的高度分布规律在湿地生态管理中具有重要的指导意义,调研结果显示,生长初期与生长后期香蒲体内营养元素的高度分布具有近似相反的规律性。
Typha have important function for keeping species multiformity and good water quality of Nansihu wetlands as one of the main species. Absorption to nitrogen and phosphorus by Typha is studied in Nansihu wetlands. The results showed that： the cumulation of nitrogen and phosphorus in Typha is regular along with its growth. That is to say the nitrogen and phosphorus was transported upwards or downwards in different month. The Typha may should be harvest in late October or November timely. Compared with 2007year, the nutrition of nitrogen and phosphorus is accumulative in 2008 year. But in late of the growth period part of nutrition was transported to soil environment. The different distribution of nutrition in Typha is important in wetland management. The nutrition distribution in different height of Typha if reversed but regular.
出处
《生态环境学报》
CSCD
北大核心
2009年第3期1020-1025,共6页
Ecology and Environmental Sciences
基金
NSFC-JST重大国际合作项目(50721140017)
国家"十一五"科技支撑计划项目(2006BAC10B03-03)
