Abstract
The suitability of land for C. konishii was evaluated using the analytic hierarchy process (AHP) method, which included multiple criteria, such as elevation, soil, climate, and vegetation characteristics. 120 different sites of C. konishii were studied and the model approximations were verified by a confusion matrix. The subsistence of C. konishii was mainly affected by topographic features (elevation, slope) and soil (soil texture) conditions. 15 variables were selected for the ecological analysis and construction of the land suitability map. They were combined into four main groups for weights approximation. The weights obtained by AHP were calculated as follows: topographic features (65%), soil (21.3%), climate conditions (7.4%), and vegetation type (6.3%). The total area with the highest suitability was estimated at 4, 6, 2 and 8% of the province area in Son La, Ha Giang, Thanh Hoa, Nghe An, respectively. The suitable areas for planting were located in Mai Son, Muong La, Moc Chau, Sop Cop districts of Son La province; Hoang Su Phi, Xin Man districts of Ha Giang province; Muong Lat district of Thanh Hoa province; Que Phong, Ky Son, Tuong Duong, Con Cuong districts of Nghe An province. Nghe An province has the largest suitable area for planting. The estimated AHP accuracy was 91.6%, which indicates that the approach is reliable for forestry management. The current study will provide a ground to the local population for the selection of suitable lands, ensuring the sustainability of natural resources, sustainable use and quality forest production.
Highlights
Cunninghamia lanceolate var. konishii was first discovered in Taiwan, it was described as Cunninghamia konishii Hayata and was later found in Vietnam, Laos and continental China (Hayata 1908; Farjon 2010; Jagel 2014)
The study focuses on the provinces of Ha Giang, Son La, Thanh Hoa and Nghe An (Fig. 1), which include more than 50% of the forest area in Vietnam (Fig. 7, General Statistics Office of Vietnam 2019)
Thanh Hoa province is situated in the middle of North and Central Vietnam, which is influenced by both regions including the «Laos Wind»
Summary
In Vietnam it is mainly distributed in Ha Giang, Son La, Thanh Hoa and Nghe An provinces (Phan et al 2009; Nguyen et al 2017; Thai et al 2015) It can be found at elevations of 1300 – 2800 m in Taiwan (Liang 2010), 1300 – 2000 m in China, 900 – 2200 m in Laos (Averyanov 2014), 1000 – 1600 m in Vietnam (Phan et al 2017). It grows on deep, well-drained loams or loamy sand soil, but can be GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY found on weathered soils from granite or other silicate originated rocks. The areas of distribution, ecology, natural active ingredients, phytochemicals and other possible resources of C. konishii need to be explored for its conservation
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