[Habitat factor analysis for Torreya grandis cv. Merrillii based on spatial information technology]

Area of Science:

• Ecology
• Botany
• Environmental Science

Background:

• Torreya grandis cv. Merrillii is a rare tree species with significant economic value.
• Its specific and strict growth requirements necessitate detailed habitat analysis for sustainable development.
• Understanding its ecological niche is crucial for effective planting and management strategies.

Purpose of the Study:

• To analyze the special habitat factors influencing Torreya grandis cv. Merrillii in its core region.
• To provide guiding information for the planting, management, and sustainable development of this valuable tree species.
• To identify key environmental variables affecting its distribution and growth.

Main Methods:

• Utilized spatial information technology, including IKONOS imagery and Digital Elevation Model (DEM) data.
• Conducted field surveys in seven villages of Zhuji City, Zhejiang Province, China.
• Applied Principal Component Analysis (PCA) to analyze habitat factors and environmental data.

Main Results:

• Torreya grandis cv. Merrillii demonstrated high selectivity for environmental factors like elevation, slope, and aspect.
• 96.22% of trees were found between 300-600m elevation, 97.52% on slopes <30°, and 74.43% on sunny/half-sunny slopes.
• PCA indicated moisture, heat, and soil nutrients are primary factors, with moisture potentially being the most critical.

Conclusions:

• Environmental factors such as elevation, slope, and aspect significantly influence Torreya grandis cv. Merrillii distribution.
• Moisture is likely the most crucial ecological factor for this species, given its unique biological and ecological traits.
• The findings offer valuable insights for the conservation and cultivation of Torreya grandis cv. Merrillii.