| 农田排水对沼泽湿地毛果苔草的影响及效应 |
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| 引用本文： | 王洋,刘景双,王国平,苏伟.农田排水对沼泽湿地毛果苔草的影响及效应[J].水科学进展,2008,19(2):198-204. |
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| 作者姓名： | 王洋 刘景双 王国平 苏伟 |
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| 作者单位： | 1.中国科学院东北地理与农业生态研究所, 吉林, 长春, 130012; |
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| 基金项目： | 中国科学院知识创新工程项目
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国家自然科学基金 |
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| 摘 要： | 随着三江平原沼泽湿地的垦殖,农田排水不断进入沼泽湿地,对湿地生态系统造成不同程度的影响。当一定氮、磷浓度的农田排水进入毛果苔草沼泽湿地后,水中TN、NH4+-N、TP和PO43--P的含量均明显升高,8~9月份TN和NH4+-N含量分别为自然沼泽湿地水体的1.51~2.10倍和1.53~3.02倍;TP和PO43--P含量分别为1.30~4.08倍和4.33~11.33倍。接受农田排水的毛果苔草根、茎叶生物量明显增高,相应的植物不同部分TN、TP含量也明显增高,其毛果苔草根部TN、TP含量与水中TN、TP含量的相关关系比自然湿地毛果苔草的这一相关关系更强,表明农田排水可促进毛果苔草的生长和对氮、磷的吸收。由于农田排水中磷的含量相对较高,造成湿地水系统N/P失衡,对湿地毛果苔草生态系统的稳定性和生物生产力形成潜在的威胁,因此应控制农田排水直接排入沼泽湿地。
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| 关 键 词： | 农田排水 氮磷 沼泽湿地 毛果苔草 生物量 |
| 文章编号： | 1001-6791(2008)02-0198-07 |
| 收稿时间： | 2007-02-27 |
| 修稿时间： | 2007年2月27日 |
Effect of paddy field drainage on Carex lasiocarpa mire wetland |
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| WANG Yang,LIU Jing-shuang,WANG Guo-ping,SU Wei.Effect of paddy field drainage on Carex lasiocarpa mire wetland[J].Advances in Water Science,2008,19(2):198-204. |
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| Authors: | WANG Yang LIU Jing-shuang WANG Guo-ping SU Wei |
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| Affiliation: | 1.Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China;2.Graduate School, Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Along with the reclamation of Sanjiang plain mire-wetland area,the paddy field's drainage goes into the natural freshwater of the mire-wetland,which will influence the wetland's eco-systems ultimately. When paddy field drainage with certain concentrations of nitrogen and phosphorus are discharged into the Carex lasiocarpa mire-wetland water,the concentrations of TN,NH4+ N,TP and PO43- P all increase obviously. Especially in August and September the concentrations of TN and NH4+ N are 1.51-2.10 times and 1.53-3.02 times as much as those of natural mire-wetland freshwater respectively,and the concentrations of TP and PO43- P are 1.30-4.08 times and 4.33-11.33 times as much as those of natural mire-wetland freshwater respectively. The biomass of the roots and stem-leaves of Carex lasiocarpa increases in the wetland with the paddy field drainage compared with those in natural wetland. The contents of nitrogen and phosphorus in the roots and stem-leaves of Carex lasiocarpa in the wetland with the paddy field drainage are much higher than those in natural wetland,and the correlation coefficients between TN and TP concentrations in Carex lasiocarpa roots and wetland water TN and TP contents are higher in the wetland accepting the paddy field drainage,which indicates that the paddy field drainage can improve Carex lasiocarp a growth and the absorption of nitrogen and phosphorus. Therefore,Paddy field drainage should be prohibited from discharging into wetland directly because of the unbalance of N/P otherwise it will threaten the stability and bio-productivity of wetland eco-systems. |
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