怀九河
怀九河-
五是以四渡河村为主，挖掘“蓝色”怀九河文化，打造生态观光游览基地。
Fifthly , with the Siduhe Village being the center , excavate the " blue " Huaijiuhe and build the ecological sightseeing base .
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怀九河源头的物种丰度和硅藻多度均最大，洞台、黄坎丝状蓝藻占优势，怀柔水库绿藻占优势；
The headwaters of Huaijiuhe River have highest species abundance and the highest diatom density , filamentous blue algae dominate in Dongtai and Huangkan , and green algae dominate in Huairou Reservoir ;