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In order to explore the temporal and spatial variation of annual precipitation and the type of precipitation field in Heilongjiang Province, this paper analyzed the precipitation of Heilongjiang Province from 1980 to 2020 using the Mann-Kendall test method, EOF decomposition method, Morlet wavelet analysis and other methods commonly used in modern climate statistical diagnosis. The results show that the precipitation tendency rate in Heilongjiang Province from 1980 to 2020 is 15.52 mm/10 a, that is, the precipitation has a significant upward trend. The precipitation in summer accounts for about 65% of the whole year, and only 3% in winter; Under the influence of topography and climate, precipitation in Heilongjiang Province showed significant spatial differences. As a whole, the south and central regions have higher precipitation, followed by the east, and the west and north regions have lower precipitation. According to the EOF decomposition, the precipitation in Heilongjiang Province can be divided into three modes and six precipitation fields: the first mode indicates that the precipitation in Heilongjiang province is more or less; The second mode showed that the central and northeastern parts of the province had more precipitation, while the southwest and Greater Khingan Mountains had less or opposite precipitation. The third mode showed that the precipitation was higher in the southwest of the province, and less or opposite in the southeast and Greater Khingan Mountains. There were two scale variation cycles of precipitation in Heilongjiang Province, 11-30 a and 3-7 a, with 28 a as the first main cycle.
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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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