Study on Seed Rain and Natural Regeneration of Sophora davidii (Franch.) Population in Arid Valley of the Minjiang River

In order to restore and reconstruct the vegetation in dry valleys, the seed rain and breeding countermeasures of Sophora davidii (Franch.) were studied, wich could provide basis for vegetation restoration and reconstruction in dry valleys. According to the distribution of the main foundation species of Sophora davidii (Franch.) in the dry valley, the field investigation was carried out by using the method of sample field survey. The results showed thtat: (1) Judging from the number of seeds, the seed quantity of Sophora davidii (Franch.) was relatively higher at low and high altitudes, and the lowest at 1700 m—1800 m altitude. (2) The number of seeds in the kernel increased with the elevation gradient, and the seed number per pod at an altitude of 1800 m—2200 m was mainly more than 3. (3) The fall time of seed rain mainly started from June, and the seed rain drop density gradually increased, with the peak period from mid-July to early August and the end period in mid-late August. During the seed rain, the rate of insect-eaten seeds decreased with the increase of seed quantity. (4) Seed germination seedlings of the Sophora davidii (Franch.) population were mainly distributed in high-altitude areas with large seed quantity. Increasing the quantity and quality of seeds in the soil seed bank in dary valleys can increase the chances of germination and regeneration.