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AM真菌在生态系统中的作用

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杨利霞        

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    2021-8-11 17:59
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    发表于 2021-2-5 07:42 |只看该作者 |倒序浏览
    |招呼Ta 关注Ta
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    AM真菌在生态系统中的作用
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    Forests accumulate and store large amounts of carbon (C), and a sub% T8 |: u, _6 v
    stantial fraction of this stock is contained in deadwood. This transient pool is subject/ M# f! p, ]: E) f+ e9 h9 m
    to decomposition by deadwood-associated organisms, and in this process it contrib! f4 u4 o+ `  ^" W5 T
    utes to CO2
    + G& y% H+ H. u- @) B' vemissions. Although fungi and bacteria are known to colonize dead- g5 b* ?, L; v3 b1 d& a" g& z
    wood, little is known about the microbial processes that mediate carbon and nitro
    ; Y: X+ g: B4 E* w7 ?4 m( Igen (N) cycling in deadwood. In this study, using a combination of metagenomics,
      N. s, \+ y/ K$ Z# g* e* Nmetatranscriptomics, and nutrient flflux measurements, we demonstrate that the decom# u/ a# A) b/ q6 I
    position of deadwood reflflects the complementary roles played by fungi and bacteria.
    . @0 f" e$ Q# D3 R9 H- [/ y8 dFungi were found to dominate the decomposition of deadwood and particularly its re
    # c0 v4 x$ W5 y& Jcalcitrant fractions, while several bacterial taxa participate in N accumulation in dead
    / l4 c$ O+ `; K& t5 i' t: x  Owood through N fifixation, being dependent on fungal activity with respect to deadwood, @$ D  L# L7 a8 Z1 P% ]. c
    colonization and C supply. Conversely, bacterial N fifixation helps to decrease the con
    0 b3 g" \, s! K9 [1 E7 B9 F. k. q9 kstraints of deadwood decomposition for fungi. Both the CO2 efflflux and N accumulation
    & a" R+ _1 Q7 Vthat are a result of a joint action of deadwood bacteria and fungi may be signifificant for- A! a' a" L0 y2 Q/ B% t
    nutrient cycling at ecosystem levels. Especially in boreal forests with low N stocks, dead5 x3 w; m1 Q( G5 U
    wood retention may help to improve the nutritional status and fertility of soils.9 ]5 y5 S7 M( K0 x3 @
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    2 V/ @$ x+ o7 p1 ]  {" H
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