Liu Si-Ru, Zhao Ji-Dong, Xiao Shang-Bin, Ni Zhao-Kui, Wang Sheng-Rui
College of Hydraulic&Environmental Engineering, China Three Gorges University, Yichang 443002, China.
Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China.
Huan Jing Ke Xue. 2020 Feb 8;41(2):734-742. doi: 10.13227/j.hjkx.201907160.
Spatial and temporal characteristics of release fluxes of sediment nitrogen (N) and phosphorus (P) were investigated in the high-risk period of algal blooms in Lake Erhai. Moreover, the influence factors were examined. Results show that the release flux of N and P increased in recent years, exhibiting a clear increase in the period from 2009 to 2013, and a slight increase in the period since 2013. The release flux of dissolved total nitrogen (DTN) ranged between 11.71-14.15 mg·(m·d), within which the release flux of dissolved organic nitrogen (DON) and dissolved inorganic nitrogen (DIN) were 6.39-8.42 mg·(m·d) and 5.31-5.73 mg·(m·d), accounting for 58% and 42% of the DTN, respectively. The release flux of dissolved total phosphorus (DTP) ranged between 0.11-0.14 mg·(m·d), within which the release flux of dissolved organic phosphorus (DOP) and dissolved inorganic phosphorus (DIP) were 0.04-0.05 mg·(m·d) and 0.07-0.09 mg·(m·d), accounting for 34% and 66% of the DTP, respectively. The distribution of release flux of N showed a decreasing order:south > north > middle, while P was north > middle > south. The release flux of N increased by 17%, 13% and 23%, and the release flux of P increased by 19%, 28%, and 29% in north, middle, and south part of Lake Erhai from 2009 to 2018. Comparing the years 2009, 2013 and 2018, although the contents of N and P were stable, the release flux of N and P in the sediment was enhanced due to increasing pH and decreasing DO. Therefore, the increasing release of nitrogen and phosphorus from sediments, caused by changes in the water environment factors, should be paid attention to for the protection of Lake Erhai.
在洱海藻类水华高发期，对沉积物氮（N）和磷（P）释放通量的时空特征进行了研究。此外，还考察了影响因素。结果表明，近年来N和P的释放通量有所增加，在2009 - 2013年期间呈明显上升趋势，2013年以来略有增加。溶解态总氮（DTN）的释放通量范围为11.71 - 14.15 mg·(m·d)，其中溶解态有机氮（DON）和溶解态无机氮（DIN）的释放通量分别为6.39 - 8.42 mg·(m·d)和5.31 - 5.73 mg·(m·d)，分别占DTN的58%和42%。溶解态总磷（DTP）的释放通量范围为0.11 - 0.14 mg·(m·d)，其中溶解态有机磷（DOP）和溶解态无机磷（DIP）的释放通量分别为0.04 - 0.05 mg·(m·d)和0.07 - 0.09 mg·(m·d)，分别占DTP的34%和66%。N释放通量的分布呈现出南部＞北部＞中部的递减顺序，而P的顺序为北部＞中部＞南部。从2009年到2018年，洱海北部、中部和南部N的释放通量分别增加了17%、13%和23%，P的释放通量分别增加了
