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首页> 外文期刊>European Journal of Soil Biology >A long-term effect of Larix monocultures on soil physicochemical properties and microbes in northeast China
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A long-term effect of Larix monocultures on soil physicochemical properties and microbes in northeast China

机译：Larix单一文献对东北土壤理化性质和微生物的长期影响

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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 (NO = 34, P 0.05) than in NS (NO = 22) and in LP_NS (NO = 19); but species diversity was not different among the three forest types (2.1 = H' = 2.7, P > 0.09). LP showed significant reductions (P 0.006) in measures of soil fertility as lower soil N and P concentrations, lower soil pH, and higher soil bulk density than NS and LPNS. Microbial PLFA did not differ among the three stands (P > 0.11) except for the ratios of G+/G-, sat/mono, and cy/prec PLFAs (P 0.03). Our findings indicate that the plantation of Larix where ingrowth of other species occurred did not show declines in overstory productivity. However, AGB and litter biomass shifts from broadleaved species to conifers in LP relative to NS and LPNS caused some soil changes that may relate to long-term productivity losses.
机译：通常认为森林单一栽培是为了改变微生物群落，降低土壤肥力，并与种植园中的混合物种或自然站立的混合物种相比，降低森林生产力。由于单一栽培的土壤改变的机制并没有很好地阐明，我们比较了三种森林类型的待生产率和土壤的指标在中国东北地区毛泽兰森林农场的自然森林下发展的同一土壤中生长。这三种森林类型是落叶树种植园的种植单一栽培，但是，将其他物种允许到（LP），混合物种自然支架（NS）和通过将Larix幼苗种植到自然支架（LP_NS）中产生的混合物种支架。我们测量了植被响应，如下流的生物量（AGB），物种丰富性和多样性，土壤反应为土壤理发学性质，以及作为磷脂脂肪酸（PLFA）的微生物群落反应。目标是确定（1）如果落叶松植物的生产率相对于自然支架减少，如果是的话，（2）哪种土壤或。微生物群落因素与生产率下降有关，（3）植被特征如何，土壤理化性质和微生物群落的互动。这三种森林类型在地上生物量和垃圾生物量出现了相似。如预期的那样，178.3mg HA（-1）含量的83％的LP含量为AgB是针叶树，NS中的87％的134.7mg（-1）AgB是阔叶物种，176.9mg HA（-1）的LP_NS具有类似的针叶树AGB（53％）和阔叶agb（47％）。 λ的物种较高的LP（no = 34，p <0.05）比ns（no = 22）和lp_ns（no = 19）;但是，三种森林类型（2.1 = H'之间的物种多样性在不同之下（2.1 = 2.7，p> 0.09）。 LP在土壤肥力的测量下显着降低（P <0.006），以降低土壤肥力，降低土壤pH，较高的土壤pH，较高的土壤堆积密度而不是NS和LPN。除了G + / G-，SAT / MONO和CY / PRFAS的比例外，微生物PLFA在三个代表（P> 0.11）中没有差异（P <0.03）。我们的研究结果表明，落叶松的种植园发生在其他物种的发生时没有表现出不含疏散生产率的下降。然而，AgB和垃圾生物量从阔叶物种转移到LP相对于NS和LPN中的针叶剂导致一些土壤变化可能与长期生产率损失有关。

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