Effects of intermediate degree of river sand/gravel mining on chlorophyll a of river periphyton
In order to verify the hypothesis that intermediate degree of river sand/gravel mining may be less harmful to the rive ecosystem. The chlorophyll a of periphyton was intensively investigated in Taizi River tributaries, northeast China. The results were as follows: 1) SS in Xi was significantly higher than the other tributaries, but there was no significant difference of Chl.a in Xi and North Taizi. Even that Chl.a in Xi was significantly higher than South Taizi and Haicheng; 2) TN in Xi was significantly higher than the other tributaries. These indicated that nutrient matters can compensate some harmful of SS to the Chl.a of periphyton. The intermediate degree of river sand/gravel mining did not affect chlorophyll a of periphyton in Taizi River tributaries. It is strongly suggested that when it necessary to mining sand/gravel in river bed for developing economics, some lower order tributaries that have the similar hydrology characteristics with undisturbed tributaries in Taizi River should be well protected, so as to give harbours to river biology. When the river sand/gravel mining is stopped, the river biology can come back and the river ecosystem can be rejuvenation.
River sand/gravel mining chlorophyll a periphyton river biology Taizi River
L.B.Chen X.A.Yin Z.F.Yang
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875,China
国际会议
The 3rd Biennial ISRS Symposium Achieving Healthy and Viable Rivers (ISRS)第3届国际河流大会
北京
英文
176-179
2013-08-05（万方平台首次上网日期，不代表论文的发表时间）