三峡水库香溪河库湾春季水华期间悬浮物动态

在三峡水库香溪河库湾春季藻类水华期间开展了水体悬浮物动态研究.调查结果表明：总悬浮物浓度的中位数是6.80 mg·L^-1, 波动范围是0.66～134.92 mg·L^-1，从河口到库尾入库点呈现逐渐递增的趋势;无机悬浮物空间格局与总悬浮物基本相似，而有机悬浮物空间格局与总悬浮物差异较大，与叶绿素a较为相似.回归分析表明：库湾中部水域叶绿素a与总悬浮物、有机悬浮物均有显著的线性关系，分别解释了总悬浮物、有机悬浮物总变异的66.7%～96.7% 和 58.9%～85.5%;在库湾两端（河口与库尾）叶绿素a与悬浮物参数均没有显著的线性关系.在库湾中部水域，有机悬浮物比无机悬浮物更能解释总悬浮物的变异;在库湾两端，无机悬浮物比有机悬浮物更能解释总悬浮物的变异.这意味着库湾中间水域总悬浮物的动态主要受有机悬浮物内源性生产的影响，而河口或库尾总悬浮物的动态主要受外源性的无机悬浮颗粒物输入的影响.

Dynamics of suspended solids in Xiangxi Bay of Three Gorges Reservoir during spring algal bloom period.

The dynamics of total suspended solids (TSS) in Xiangxi Bay of Three Gorges Rese rvoir (TGR) during the period of spring algal bloom were weekly investigated. Th e results showed that the TSS in the Bay ranged from 066 to 13492 mg ·L-1, with a median of 680 mg·L-1, and tended to be increased fr om headwater to down-lake zones. The spatial pattern of non-volatile suspended solids (NVSS) was similar to that of TSS, while volatile suspended solids (VSS) showed obviously different pattern from TSS and followed the spatial pattern of chlorophyll a. Regression analysis indicated that in the mid-zone of the Bay, chlorophyll a was significantly related to TSS and VSS, and explained 667% 〖KG-*2〗-〖KG-*7〗967% and 589%〖KG-*2〗-〖KG-*7〗855% of the variance in TSS and VSS, respectively. In the headwater and down-lake zones, there were no significant relationships between chlorophyll a and TSS (including NVSS and VSS ). The TSS in mid-lake had more close relationship with VSS than with NVSS, while that in headwater and down-lake had more close relationsh ip with NVSS than with VSS, implying that the mid-lake of Xiangxi Bay was a mor e autochthonous system than the headwater and down-lake where allochthonous inf luences were the more determinant factors.