Hydrilla was found in Asia and was introduced to the United States in the 1960s.
软水草原产于亚洲，并在20世纪60年代引入美国。
The influence of the free floating macrophyte Hydrocharis dubia on the growth of the submerged macrophyte Hydrilla verticillata was studied by using different coverage of H.
通过黑藻和不同覆盖度水鳖的组合，研究了漂浮植物对沉水植物的影响。
The influence of the free floating macrophyte Hydrocharis dubia on the growth of the submerged macrophyte Hydrilla verticillata was studied by using different coverage of H.
通过黑藻和不同覆盖度水鳖的组合，研究了漂浮植物对沉水植物的影响。
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