Davis Jeffrey C, Minshall G Wayne
Streamside Environmental Services, P.O. Box 771428, Eagle River, AK 99577, USA Tel.: +1-907-6964240, Fax: +1-907-5616134, , , , , , US.
Stream Ecology Center, Department of Biological Sciences, Idaho State University, Pocatello, ID 83209, USA, , , , , , US.
Oecologia. 1999 May;119(2):247-255. doi: 10.1007/s004420050783.
Nitrate and phosphate solutions were released into two reaches of two central Idaho streams to determine within- and between-stream variability in uptake lengths, uptake rates, and mass transfer coefficients. Physical and biotic stream characteristics and periphyton nitrate-uptake rates in recirculating chambers were measured to determine their influence on nutrient dynamics. Phosphate uptake length did not differ among the four reaches. There were no within-stream differences in nitrate uptake lengths but they did differ between the two streams. Long nitrate uptake lengths likely were due to instream concentrations above saturation but also may have been influenced by differences in active surface area and algal abundance. Nitrate and phosphate uptake lengths were longer, and uptake rates higher, than most other published values. However, mass transfer coefficients were comparable to measurements in other streams. Mass transfer coefficients may be a better parameter for temporal and spatial comparisons of instream nutrient dynamics, and for determining the underlying causes of variability in uptake length.
硝酸盐和磷酸盐溶液被排放到爱达荷州中部两条溪流的两段区域，以确定溪流内部和溪流之间在吸收长度、吸收率和传质系数方面的变异性。测量了物理和生物溪流特征以及循环室内的周丛生物硝酸盐吸收率，以确定它们对营养动态的影响。四个区域的磷酸盐吸收长度没有差异。溪流内部硝酸盐吸收长度没有差异，但两条溪流之间存在差异。较长的硝酸盐吸收长度可能是由于溪流中浓度高于饱和度，但也可能受到活性表面积和藻类丰度差异的影响。硝酸盐和磷酸盐的吸收长度比大多数其他已发表的值更长，吸收率也更高。然而，传质系数与其他溪流的测量值相当。传质系数可能是用于溪流营养动态的时间和空间比较以及确定吸收长度变异性根本原因的更好参数。
