Abstract:The content and distribution characteristics of dissolved organic phosphorus (DOP) were studied by collecting water samples from different sources of Dianchi Lake (overlying water, inflowing rivers and rainfall) in summer,and the bioavailability of these DOP were also characterized by emzymatic hydrolysis. The results indicated that the concentrations of DOP from overlying water, inflowing rivers and rainfall ranged from 0.001~0.117, 0.002~1.722 and 0.006~0.112mg/L (average, 0.027, 0.197 and 0.037mg/L), respectively, and constituted 18.3%~92.5%, 4.2%~100% and 25.4%~100% (average, 55.3%, 60% and 58.9%) of dissolved total phosphorus (DTP), respectively. DOP predominated their DTP of the different sources samples, and the concentrations of DOP from inflowing rivers were significantly higher than that from overlying water and rainfall. The concentrations of enzymatically hydrolysable phosphorus (EHP) of DOP from different sources ranged from not detectable (n.d.)~0.058, n.d.~0.673 and n.d.~0.031mg/L (average, 0.017, 0.064 and 0.010mg/L), accounting for 0~127.5%, 0~105.6% and 0~55.6% (average, 77.9%, 38.7% and 23.2%) of DOP, respectively. The enzymatica hydrolysis ratio of DOP (EHP/DOP) were relatively high and EHP/DOP from overlying water was significantly greater than that from inflowing rivers and rainfall. DOP from different sources showed evident characteristic of spatial and temporal distribution and their bioavailability had great differences.Labile monoester P and phytate-likeP represented primary portions of EHP from overlying water, whereas, labile monoester P accounted for major sections of EHP from the inflowing rivers and rainfall, especially for EHP of the rainfall which had relatively low concentrations of diester P and phytate-like P. The bioavailability of DOP from overlying water, inflowing rivers and rainfall declined in turn. DOP from different sources represented the available P of equivalent magnitude to soluble reactive phosphorus (SRP), that meant EHP and SRP keep the eutrophication of Dianchi Lake together. So the effects of different phosphorus species from different sources on water quality should be considered for protection of Dianchi Lake from the whole watersheds.
何宗健, 熊强, 焦立新, 王圣瑞. 夏季滇池不同来源溶解性有机磷特征及其生物有效性[J]. 中国环境科学, 2014, 34(12): 3189-3198.
HE Zong-Jian, XIONG Qiang, JIAO Li-Xin, WANG Sheng-Rui. Characteristics and bioavailability of dissolved organic phosphorus from different sources of Lake Dianchi in summer. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(12): 3189-3198.