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A long-term effect of Larix monocultures on soil physicochemical properties and microbes in northeast China
European Journal of Soil Biology ( IF 4.2 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.ejsobi.2019.103149 Jie Zhang , Jianwei Zhang , Lixue Yang
European Journal of Soil Biology ( IF 4.2 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.ejsobi.2019.103149 Jie Zhang , Jianwei Zhang , Lixue Yang
Abstract Forest monocultures are generally considered to alter the microbial community, reduce soil fertility, and presumably reduce forest productivity compared to mixed species in plantations or mixed species in natural stands. As the mechanisms of alteration of soils by monocultures have not been elucidated very well, we compared indicators of stand productivity and soils in three forest types all growing on the same soils that developed under the natural forests of the Maoershan Forest Farm in northeastern China. The three forest types were a planted monoculture of Larix plantation but where other species were allowed to ingrow (LP), a mixed species natural stand (NS), and a mixed species stand created by planting Larix seedlings into a natural stand (LP_NS). We measured the vegetation response as aboveground biomass (AGB), species richness and diversity, the soil response as soil physicochemical properties, and microbial community response as phospholipid fatty acids (PLFAs). The objectives were to determine (1) if the productivity of the Larix plantation was reduced relative to the natural stand, and if so, (2) which soil or microbial community factors were related to the declining productivity, and (3) how vegetation characteristics, soil physicochemical properties, and microbial community interacted. The three forest types appeared similar in aboveground biomass and litter biomass. As expected, 83% of 178.3 Mg ha−1 overstory AGB in LP was conifers and 87% of 134.7 Mg ha−1 AGB in NS was broadleaved species, and LP_NS with 176.9 Mg ha−1 had similar conifer AGB (53%) and broadleaved AGB (47%). Species richness for understory was greater in LP (N0 = 34, P 0.09). LP showed significant reductions (P 0.11) except for the ratios of G+/G-, sat/mono, and cy/prec PLFAs (P
更新日期：2020-01-01
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