文献类型：期刊文献

英文题名：Unravelling the Functional Diversity of the Soil Microbial Community of Chinese Fir Plantations of Different Densities

作者：Wang, Chaoqun[1,2,3] Xue, Lin[2,3,4] Dong, Yuhong[1,2,3] Wei, Yihui[1,2,3] Jiao, Ruzhen[1,2,3]

第一作者：Wang, Chaoqun

通信作者：Jiao, RZ[1];Jiao, RZ[2];Jiao, RZ[3]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[3]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat State Forestry A, Beijing 100091, Peoples R China;[4]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China

年份：2018

卷号：9

期号：9

外文期刊名：FORESTS

收录：;EI(收录号：20183705800157);Scopus(收录号：2-s2.0-85052953577);WOS:【SCI-EXPANDED(收录号:WOS:000448398100028)】；

基金：This research was funded by State Key Research Development Program of China (Grant number 2016YFD0600300). This study is a part of the project entitled "Study on efficient cultivation technology of Chinese fir plantation".

语种：英文

外文关键词：stand density change drivers; plant-micro-organism interactions; metabolic function; Biolog ECO

摘要：The structure and function of forest ecosystems are directly or indirectly affected by their stand density. However, what effect the density of Chinese fir plantations has on the functional diversity of the soil microbial community remains unclear. The microbial metabolic functional diversity of soils sampled at the topsoil (0-20 cm) of 35-year-old Chinese fir plantations of five initial densities (D1: 1667 stems.hm(-2), D2: 3333 stems.hm(-2), D3: 5000 stems.hm(-2), D4: 6667 stems.hm(-2), and D5: 10,000 stems.hm(-2)) was studied by using Biolog ECO technology. The results showed that the soil pH, oxidizable organic carbon (SOOC), available N (AN), available P (AP), and available K (AK) contents all showed a gradual increase from D1 to D4 and a decrease from D4 to D5, while the number of culturable bacteria and total microorganisms, the average well color development (AWCD) values for the single carbon substrate and six types of carbon sources used by the microbial community, as well as the Shannon-Wiener diversity index (H'), Pielou evenness index (J), and McIntosh Diversity Index (U), were the opposite, suggesting that low-densities favored C and N mineralization and the nutrient cycle. The density of Chinese fir plantations had a significant effect on the use of carbohydrates, amino acids, carboxylic acids, and phenolic acids by the soil microbial community, but it had no significant effect on the use of polymers (p < 0.05). Principal component analysis (PCA) revealed that carbohydrates, polymers, and phenolic acids were sensitive carbon sources that caused differences in the metabolic functions of soil microbial communities in Chinese fir plantations. Redundancy analysis (RDA) showed that physicochemical factors have a significant influence on the metabolic function of soil microbial communities (RDA1 and RDA2 explained >85% variance). The changes in density affected the soil physicochemical properties, the composition, and the metabolic functional diversity of microbial communities in Chinese fir plantations, which is certainly useful for the stand density regulation of Chinese fir plantations.