文献类型：期刊文献

英文题名：Effects of Planting Density and Site Index on Stand and Soil Nutrients in Chinese Fir Plantations

作者：Sun, He[1,2] Lei, Jie[2,3] Liu, Juanjuan[2,3] Li, Xiaoyan[2,3] Yuan, Deyi[1] Duan, Aiguo[2,3] Zhang, Jianguo[1,2]

第一作者：Sun, He

通信作者：Zhang, JG[1];Duan, AG[2];Zhang, JG[2];Duan, AG[3]

机构：[1]Cent South Univ Forestry & Technol, Coll Forestry, Changsha 410004, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Efficient Prod Forest Resources, Beijing 100091, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China

年份：2025

卷号：17

期号：13

外文期刊名：SUSTAINABILITY

收录：;Scopus(收录号：2-s2.0-105010309053);WOS:【SSCI(收录号:WOS:001527517100001)，SCI-EXPANDED(收录号:WOS:001527517100001)】；

基金：This research was funded by the National Key Research and Development Program of China (No. 2021YFD2201300) and the National Natural Science Foundation of China (No. 32271862).

语种：英文

外文关键词：Chinese fir; planting density; site index; stand attributes; soil nutrients

摘要：This study investigated the effects of planting density and site index on stand attributes and soil nutrients in mature Chinese fir [Cunninghamia lanceolata (Lamb.) Hook.] plantations across Fujian and Sichuan Provinces, elucidating the pathways through which these factors influence standing volume (SV). The results showed that (1) planting density significantly affected stand variables, with average diameter at breast height (ADBH) decreasing and SV initially increasing and then declining with higher density. The number of mortality plants (NMP) and actual stand density (ASD) both increased significantly with higher density. Average tree height (ATH) and dominant height (DH) responses varied by region, with ATH decreasing in Sichuan and DH decreasing in Fujian with higher density. (2) Planting density affected soil nutrients differently in the two provinces, with soil total potassium (TK) increasing in Fujian and phosphorus decreasing in Sichuan. (3) Site index was positively correlated with ATH and ADBH but negatively correlated with ASD and NMP. Its relationship with soil nutrients was province-specific: in Fujian, site index was negatively correlated with total phosphorus (TP) and positively correlated with TK and soil pH, while in Sichuan it was only positively correlated with TK. (4) Structural equation modeling revealed different regulatory pathways: in Fujian, planting density influenced SV through both ASD and soil nutrients, while in Sichuan it affected only through ASD. This study highlights the region-specific interactions between planting density, site index, stand structure, and soil nutrients, providing a foundation for optimized plantation management.