Effects of Environmental Factors on Nutrients Release at Sediment-Water Interface and Assessment of Trophic Status for a Typical Shallow Lake, Northwest China

Table 5

Summary statistics on Chl-a and the other water parameters measured in Daihai Lake (𝑛=15).

Parameters	Chl-a	CODMn	NH4^+-N	NO2-N	NO3-N	TN	TP	SD	pH	WT
Chl-a	1.000
CODMn	0.338	1.000
NH4^+-N	−0.212	−0.063	1.000
NO2-N	−0.160	−0.312	0.413	1.000
NO3-N	0.018	0.395	0.098	−0.015	1.000
TN	0.602*	0.029	0.038	0.071	0.072	1.000
TP	0.646*	0.226	−0.149	−0.117	0.009	−0.396	1.000
SD	−0.587*	0.017	0.189	−0.395	−0.046	−0.09	−0.41	1.000
pH	−0.171	0.009	0.204	−0.131	0.382	−0.041	−0.225	0.397	1.000
WT	−0.009	0.110	0.051	−0.326	0.071	−0.361	−0.245	0.570*	0.424	1.000

COD: chemical oxygen demand; TN: total nitrogen; TP: total phosphorus; SD: secchi disk depth; WT: water temperature.
*Correlation is significant at the 0.05 level (2 tailed).