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The Changjiang River Estuary is an important habitat for many migratory fishes, and its complex environmental conditions affect the growth and reproduction of aquatic organisms in this area. Marine environmental monitoring buoys are capable of long-term, continuous, real-time and large-scale monitoring of many environmental factors, and are an important part of the modern marine environmental automatic observation system. To establish a reasonable and effective buoy monitoring network for the Chinese sturgeon nature reserve and its adjacent waters in the Changjiang River Estuary , this study used Ordinary Kriging (OK) method to simulate the spatial distribution of various environmental factors, and then compared the effects of different strata design and sample size of Stratified Random Sampling (StRS) on the monitoring results. The results showed that: (1) the sampling accuracy of salinity was better when the stratum of StRS was 3, and water temperature, dissolved oxygen and chemical oxygen demand (COD) was better when the stratum was 2; (2) the relative estimation errors became more concentrated and tended to 0 value with the increase of sample size, and when the sample size was larger than 30, the accuracy tended to be stable gradually; (3) the sampling accuracy of salinity in autumn was different to the other three seasons, and the sampling effect of COD in winter was worst. In the future, when setting up an environmental monitoring buoy network in the Chinese sturgeons nature reserve in the Changjiang River Estuary, it is suggest to adopt three stratum stratified random sampling for salinity monitoring, and the number of stations should be more than 50. When taking various hydrological environments as the monitoring target, it is recommended to use two stratified standard, and the number of stations should be more than 30.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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