| By selecting typical rural ponds in Poyang Lake plain, their shape, inlet and outlet settings, underwater topography, water depth, siltation, water quality and nutrient content of sediment were investigated and analyzed. The results showed that most rural ponds in Poyang Lake plain were in strip shape. There were many water inlets which were set randomly and scattered. The siltation was serious and the sediment was mainly imported by external sources. Total nitrogen and total phosphorus in water exceeded the standard 〖JP2〗to a certain extent. The overall pollution degree of total nitrogen was winter＞autumn＞summer＞spring, and total phosphorus was summer＞spring＞autumn＞winter. The contents of nutrients and organic matter in sediment were relatively high, presenting a certain pollution state. Organic matter, organic carbon and total nitrogen in sediment had high homology. They were mainly endogenous pollutants. Phosphorus in sediment was mainly imported by terrestrial sources. |
