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| Root-soil plate characteristics of three typical lodging trees in Jinyun mountain, Chongqing |
| HE Xiangchang1,2, WANG Yunqi1,2, LI Tong1,2, LI Yaoming1,2, WANG Yujing3, QI Zihan1,2, LI Kewen1,2 |
1. Three-Gorges Reservoir Area (Chongqing) Forest Ecosystem Research Station, School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
2. Jinyun Forest Ecosystem Research Station, School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
3. Guangdong Hydropower Planning & Design Institute Co., Ltd., 510635, Guangzhou, China |
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Abstract [Background] Root-soil plate is an important module for mechanical analysis and modeling of slope forest trees and understanding the mechanical mechanism of forest lodging. The purpose of this study is to predict the geometric parameters of root-soil plate based on the easily observed indexes of aboveground parts of plants, and to analyze the main influencing factors of the morphological characteristics of root-soil plate.[Methods] In this study, the field investigation was carried out on the lodging trees in the forest of Jinyun Mountain. The tree height, crown height, crown width, windward radius, leeward radius, lateral diameter, root-soil plate depth, root quantity and topographic slope of Cunninghamia lanceolata, Machilus nanmu and Gordonia acuminata were counted. The root tensile strengths of the root-soil plates of the three tree species were measured. Finally, the survey data were statistically fitted and PCA analysis was carried out.[Results] 1) G. acuminata had the largest lateral diameter and the smallest root-soil plate depth, and the number of surface roots was more than that of C. lanceolata and M. nanmu, and the whole root-soil plate of G. acuminata was in the shape of wide and shallow disc. C. lanceolata had the smallest lateral diameter and the largest root-soil plate depth, and the number of deep roots was more than that of G. acuminata and M. nanmu, and the whole root-soil plate of C. lanceolata was in the shape of narrow and deep cylinder. 2) The lateral diameter, windward radius and leeward radius of the root-soil plate of the three tree species had a strong positive correlation with the DBH (R2>0.452), while the correlation between the depth of the root-soil plate and the DBH was weak (R2<0.047). 3) The results of PCA analysis showed that there was a strong positive correlation between the lateral diameter of root-soil plate and the number of roots and topographic slope, and there was a strong positive correlation between the root-soil plate depth and the crown width and crown height ratio.[Conclusions] The indicators of the lateral diameter, windward radius and leeward radius can be predicted relatively well by the DBH, but the prediction of the depth of the root-soil plate is poor. The shapes of root-soil plates of lodging plants are mainly determined by the number of roots and the crown height ratio. More number of roots and larger topographic slope lead to greater lateral diameter of root-soil plate, and trees with larger crown height and crown width lead to greater root-soil plate depth.
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Received: 19 June 2022
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