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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
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    - h* j$ q' N: j' W- B6 v0 w/ h! s' fAM真菌在生态系统中的作用* ?8 j6 v* \" T* v( X* n8 N# I3 W. I* I

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    0 n+ \5 D7 a* J2 [7 J5 |& N0 C5 U
    + C7 k- r8 A) C$ ^# x" c+ ~Forests accumulate and store large amounts of carbon (C), and a sub( U/ B% M% p, {2 _, `  {
    stantial fraction of this stock is contained in deadwood. This transient pool is subject
    8 \2 X! ?( q5 \( z5 O2 S+ ato decomposition by deadwood-associated organisms, and in this process it contrib
    & j  K' I+ {2 ?0 C* Vutes to CO2 & Q9 f( g2 @9 T
    emissions. Although fungi and bacteria are known to colonize dead
    ( F4 c$ h0 A! W( }2 pwood, little is known about the microbial processes that mediate carbon and nitro
    $ S/ ^- Z5 O! z; e* y2 ~gen (N) cycling in deadwood. In this study, using a combination of metagenomics,' W) B1 r0 v5 e0 N+ F
    metatranscriptomics, and nutrient flflux measurements, we demonstrate that the decom+ z) r6 I5 @4 X. `9 K# H* R2 _
    position of deadwood reflflects the complementary roles played by fungi and bacteria.* `7 t" \6 T5 _% l, ]
    Fungi were found to dominate the decomposition of deadwood and particularly its re$ Y2 e4 f8 ?- j9 N% U) f
    calcitrant fractions, while several bacterial taxa participate in N accumulation in dead: w. v* ^  Q, P6 I4 R
    wood through N fifixation, being dependent on fungal activity with respect to deadwood5 Y1 [- q8 k- v4 p2 ~, N
    colonization and C supply. Conversely, bacterial N fifixation helps to decrease the con4 `# M! t9 z2 U6 k
    straints of deadwood decomposition for fungi. Both the CO2 efflflux and N accumulation# s2 I0 ]% r* D6 F1 r
    that are a result of a joint action of deadwood bacteria and fungi may be signifificant for
    5 Z3 }- d+ |6 G; k9 Nnutrient cycling at ecosystem levels. Especially in boreal forests with low N stocks, dead9 f2 t' X% B  p' }" ?
    wood retention may help to improve the nutritional status and fertility of soils.$ I0 E4 ]0 c2 R- J" a% P% _/ U) b

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