The winter water bird resources were surveyed in typical wetlands of Henan province from December 1997 to May 1998 by the combination of water surface cruise and bank plot observation.
采用河岸定点观察和水面巡航相结合的方法，于1997 ~ 1998年调查了河南省典型湿地冬季水鸟资源。
The winter water bird resources were surveyed in typical wetlands of Henan province from December 1997 to May 1998 by the combination of water surface cruise and bank plot observation.
采用河岸定点观察和水面巡航相结合的方法，于1997 ~ 1998年调查了河南省典型湿地冬季水鸟资源。
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