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引用本文:葛绪广,王国祥,李振国,王文林,潘国权.凤眼莲凋落物及其残体的沉降.湖泊科学,2009,21(5):682-686. DOI:10.18307/2009.0511
GE Xuguang,WANG Guoxiang,LI Zhenguo,WANG Wenlin,PAN Guoquan.The litter and residue of Eichhornia crassipes(Mart.) Solms. J. Lake Sci.2009,21(5):682-686. DOI:10.18307/2009.0511
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凤眼莲凋落物及其残体的沉降
葛绪广1, 王国祥2, 李振国3, 王文林2, 潘国权2
1.湖北师范学院地理科学系, 黄石 435002;2.南京师范大学地理科学学院, 江苏省环境演变与生态建设重点实验室, 南京 210046;3.湖南科技大学, 湘潭 411201
摘要:
水生植物凋落物和残体的沉降在水体生态系统物质循环和能量流动中具有重要作用.在有凤眼莲生长的自然水体中,利用沉降物捕获器原位采集凤眼莲生长、衰亡及腐烂分解等不同阶段的沉降物,分析测定其沉降量、沉降通量、有机碳、总氮和总磷的动态变化,结果显示:自凤眼莲死亡至残体从水面消失的4个月中,沉降瓶内的沉降量呈明显上升趋势,在残体从水面完全消失时(4月中旬)沉降量达到最大值579.59g/m2,同时,沉降通量亦达到最高值7.54g/(m2·d),二者与水温呈极显著正相关(P>0.01);在凤眼莲生长期,沉降物的有机碳、总氮、总磷含量较低,而随着凤眼莲衰亡,残体的不断沉降,至次年4月中旬残体基本沉降进入水体底部时,沉积物的有机碳、总氮、总磷含量达到最大值,分别为40.29%、3.66%、0.90%,之后逐渐下降,并趋于稳定.
关键词:  凤眼莲  凋落物  残体  沉降物
DOI:10.18307/2009.0511
分类号:
基金项目:国家自然科学基金项目(40873057)资助
The litter and residue of Eichhornia crassipes(Mart.) Solms
GE Xuguang1, WANG Guoxiang2, LI Zhenguo3, WANG Wenlin2, PAN Guoquan2
1.Department of Geographical Science, Hubei Normal University, Huangshi 435002, P.R.China;2.College of Geographic Science, Nanjing Normal University, Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Nanjing 210046, P.R.China;3.Hunan University of Science and Technology, Xiangtan 411201, P.R.China
Abstract:
The litter and the residue of the aquatic plants play an important role in the nutrient cycle and energy flow. Under naturalconditions, the sediment was collected in situ at different stages of Eichhornia crassipes, and its changes of the litter and residue werestudied. The weight of sediment had an obviously increasing trend from waterhycinth death to its disappearance from water surface.When the litter and residue disappeared completely from water surface, the weight of sediment and the downward fluxes reached themaximum value 579.59g/m2, 7.54g/(m2·d) respectively. Both of them had a significantly positive correlation with the watertemperature. When the litter and residue disappeared completely from water surface, the organic carbon, total nitrogen and totalphosphorus were low in the growth but high in the floating, and reached the maximum values 40.29%, 3.66%, 0.90% respectively,then they gradually decreased, and tended to be stable.
Key words:  Eichhornia crassipes(Mart.) Solms  litter  residue  sediment
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