Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： The influence of different slope-facing environmental factors on the natural regeneration of Piceaschrenkiana in the middle section of the northern slope of Tianshan Mountains was investigated. A series of plotswere established on shady, semishady, semisunny, and sunny slopes at the same altitude, in a Picea schrenkianaforest to develop the structure equation model for the regeneration index which uses different slope- facingenvironmental factors. According to the environmental characteristics of the different slope- facings, therelationship between the survival status of Picea schrenkiana seedlings and environmental factors was analyzed.The results showed that the semishady and semisunny slopes were more suitable for the survival and growth ofseedlings, and the regeneration indexes of the two slopes (0.065 and 0.057) were significantly higher than thoseof the shady and sunny slopes. Litter was found to have a dual effect on the regeneration of Picea schrenkiana.The undecomposed litter layer was too thick to be beneficial to regeneration, while the rich organic matter couldpromote the formation of a high nitrogen environment in the soil, which was conducive to the regeneration ofseedlings. The influence of different slope-facing environmental factors on the regeneration index was in theorder of total nitrogen content (0.60) > adult tree density (0.46) > litter half- decomposed layer (0.37) > totalpotassium content (0.24) > organic matter content (0.23) > total phosphorus content ( − 0.16) > availablephosphorus content ( − 0.32) > litter undecomposed layer thickness ( − 0.34). Overall, the regeneration of Piceaschrenkiana seedlings in the region was best on the semishady and semisunny slopes with a closure degree ofapproximately 0.6 and litter thickness of approximately 2.5 cm, as well as high total nitrogen and total potassiumcontents in the soil.
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