文献类型：期刊文献

英文题名：Effects of Planting Density on Soil Bulk Density, pH and Nutrients of Unthinned Chinese Fir Mature Stands in South Subtropical Region of China

作者：Duan, Aiguo[1,2] Lei, Jie[1] Hu, Xiaoyan[1] Zhang, Jianguo[1,2] Du, Hailun[1] Zhang, Xiongqing[1] Guo, Wenfu[3] Sun, Jianjun[4]

第一作者：Duan, Aiguo;段爱国

通信作者：Zhang, JG[1];Zhang, JG[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Key Lab Forest Silviculture, State Forestry Adm,State Key Lab Tree Genet & Bre, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, Collaborat Innovat Ctr Sustainable Forestry South, Nanjing 210037, Jiangsu, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Peoples R China;[4]Chinese Acad Forestry, Expt Ctr Subtrop Forestry, Fenyi 336600, Peoples R China

年份：2019

卷号：10

期号：4

外文期刊名：FORESTS

收录：;EI(收录号：20192106961149);Scopus(收录号：2-s2.0-85065891128);WOS:【SCI-EXPANDED(收录号:WOS:000467303600059)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 31570619); the National Scientific and Technological Task in China (No. 2015BAD09B0101, 2016YFD0600302); The special science and technology innovation in Jiangxi Province (No. 201702).

语种：英文

外文关键词：Chinese fir; mature stand; planting density; soil profile; nutrient content

摘要：Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) is a fast-growing evergreen conifer with high-quality timber and is an important reforestation and commercial tree species in southern China. Planting density affects the productivity of Chinese fir plantations. To study the effect of five different planting densities and soil depth on soil nutrient contents of a mature C. lanceolata plantation, the soil nutrient contents (soil depths 0-100 cm) of 36-year-old mature Chinese fir plantations under five different planting densities denoted A (1667 treesha(-1)), B (3333 treesha(-1)), C (5000 treesha(-1)), D (6667 treesha(-1)), and E (10,000 treesha(-1)) were measured in Pingxiang county, Guangxi province, China. Samples were collected from the soil surface down to a one meter depth from each of 45 soil profiles, and soil samples were obtained at 10 different soil depths of 0-10, 10-20, 20-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, and 90-100 cm. Twelve soil physical and chemical indicators were analyzed. The results showed that: (1) as planting density increased, the organic matter, organic carbon, total N and P, available N, effective Fe, and bulk density decreased. Soil pH, total K, and effective K increased with increasing planting density. Planting density did not significantly influence the exchangeable Ca and Mg. (2) Soil organic matter; organic carbon; total N and P; effective N, P, and K; exchangeable Ca and Mg; effective Fe content; and bulk density decreased with increasing soil depth. This pattern was particularly evident in the top 30 cm of the soil. (3) Excessively high planting density is not beneficial to the long-term maintenance of soil fertility in Chinese fir plantations, and the planting density of Chinese fir plantations should be maintained below 3333 stemsha(-1) (density A or B) to maintain soil fertility while ensuring high yields.