{'fraction_non_alphanumeric': 0.0409670920080591, 'fraction_numerical': 0.026863666890530557, 'mean_word_length': 4.775193798449612, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Relationship Between Inorganic Phosphorus Fractionation of Sediment and Contents of Dissolved Reactive Phosphorus(DRP) of Overlying Water and Dissolved Reactive Phosphorus Control in Simulated Pond

The sediments and overlying water sampled from two different ponds A and B were placed in glass aquaria and cultured for 4 months under indoor environment to simulate pond environment, and six treatments were designed in the experiment to compare their effects on the forms of P and the content of dissolved reactive phosphorus (DRP). The amounts and forms of inorganic phosphorus (IP) in sediments were evaluated using a sequential chemical extraction, the relationship of potentially mobile P in sediments and contents of DRP in overlying water were analyzed. The results indicated that the order of IP forms in two sediments was Ca10-P O-P Al-P Fe-P Ca8-P Ca2-P. Ca2-P and Fe-P increased, but Ca10-P, O-P and Al-P decreased after 4 months. Correlation and path analysis showed that there were significantly positive correlation between DRP in overlying water with O-P, Ca2-P, Ca8-P and Ca10-P. The order of direct effect was O-P(0.317)Ca8-P (0.257)Ca2-P(0.244)Ca10-P(0.197)Fe-P(0.046)Al-P(-0.05). DRP contents in overlying water under five treatments were lower than those under the control, which was the lowest in the treatment with zeolite and bacilli, implying that treating pond sediment with zeolite and bacilli was the effective way to control DRP contents of overlying water.