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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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    AM真菌在生态系统中的作用
    # k  E/ d3 P$ u& {# j* b! N3 m' ?; d# l/ }0 i& G6 C" X
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    Forests accumulate and store large amounts of carbon (C), and a sub
    2 M; M& q+ m2 G) U' c/ B- rstantial fraction of this stock is contained in deadwood. This transient pool is subject
    ; r2 c* \( q6 W; T, z. K- Gto decomposition by deadwood-associated organisms, and in this process it contrib( w" g& l; H7 G4 [2 Y  u
    utes to CO2 : T9 ~9 j" ^7 j$ ]& K+ Y
    emissions. Although fungi and bacteria are known to colonize dead- t" B$ R2 C, P( p- K, W
    wood, little is known about the microbial processes that mediate carbon and nitro
    1 d) W5 L0 t# m2 Fgen (N) cycling in deadwood. In this study, using a combination of metagenomics,
    ' U. a( n# \% P* {% Y9 ]metatranscriptomics, and nutrient flflux measurements, we demonstrate that the decom
    4 ^5 E  K* w" y9 tposition of deadwood reflflects the complementary roles played by fungi and bacteria.& |6 ^, W% R8 R
    Fungi were found to dominate the decomposition of deadwood and particularly its re5 s8 m, A* A; L  W2 I1 b. f
    calcitrant fractions, while several bacterial taxa participate in N accumulation in dead
    ) B( U6 Q9 l6 a0 B7 X% c# n1 cwood through N fifixation, being dependent on fungal activity with respect to deadwood; ]- i& q6 Y8 A9 E3 o9 e; |2 i
    colonization and C supply. Conversely, bacterial N fifixation helps to decrease the con
    + S  P" ^/ O" L: |% b- p2 P3 f5 qstraints of deadwood decomposition for fungi. Both the CO2 efflflux and N accumulation
    2 M0 S3 C9 x3 t4 Gthat are a result of a joint action of deadwood bacteria and fungi may be signifificant for
    0 t# S/ Q+ l- b, y9 s$ e% Dnutrient cycling at ecosystem levels. Especially in boreal forests with low N stocks, dead
    6 X/ M1 ]0 a4 Hwood retention may help to improve the nutritional status and fertility of soils.
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