[Root exudates and soil microbes in three Picea asperata plantations with different stand ages].
This study investigated the dynamics of in situ root exudates and soil microbial composition among three Picea asperata plantations with different stand ages (9, 13 and 31 a) in Miyaluo, west Sichuan, China. The results showed that the secretion rates of root exudation per fine biomass, length, surface area and tip were significantly different among the three plantations with different stand ages. The secretion rate of root exudation was the highest in the 9-year-old plantation stand. The root activity of P. asperata was the weakest in the 13-year-old plantation stand. Besides, soil microbial biomass C (MBC) and N (MBN) between rhizosphere and non-rhizosphere soils were significantly different among the three plantation stands. MBC and MBN contents of rhizosphere soil gradually increased with stand ages, while those of non-rhizosphere soil were the largest in the 13-year-old plantation stand. The phospholipid fatty acids (PLFAs) of bacteria, fungi, actinomycetes and their summation in rhizosphere soil presented a trend of high-low-high with stand ages. The opposite pattern was found in the PLFAs of bacteria, fungi, the summation of PLFA, and the ratio of fungi number to bacteria in non-rhizosphere soil. It is suggested that root exudates might have a positive rhizosphere effect on soil microbial biomass C, N and PLFAs of functional groups.
Jiao
J
Li
Xian-Min
XM
Jiang
Hua-Jun
HJ
Yin
Chun-Ying
CY
Yin
Yu-Hang
YH
Wei
Qing
Q
Liu
D001419:Bacteria; D018533:Biomass; D002681:China; D065928:Forests; D005658:Fungi; D028222:Picea / Q000737:chemistry*; D053147:Plant Exudates / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology
D053147:Plant Exudates; D012987:Soil