4 B. ?$ r; ^6 Q) B# M' C3 o
AM真菌在生态系统中的作用* Z- z% w: X' X$ q2 u y; K
6 ^5 X$ y3 A- f" g9 ]& }# ?% u
: e* J" X; Y1 |$ W8 O+ ]- }5 t
6 ^) ?, z. a) o4 s
+ `" [" a/ K0 O( fForests accumulate and store large amounts of carbon (C), and a sub C- e! m( [% T' i' {4 D
stantial fraction of this stock is contained in deadwood. This transient pool is subject & Y3 ^/ F4 y% p- _to decomposition by deadwood-associated organisms, and in this process it contrib ' C5 n$ z# f& x& ]; | i! Q+ ]utes to CO2 3 B# C# f* @& `
emissions. Although fungi and bacteria are known to colonize dead ! M! w$ w2 z6 O9 U, t/ p+ R. awood, little is known about the microbial processes that mediate carbon and nitro# p) M% Y7 t2 I1 o5 W
gen (N) cycling in deadwood. In this study, using a combination of metagenomics, ( j- r+ O* `$ ^7 n J kmetatranscriptomics, and nutrient flflux measurements, we demonstrate that the decom4 f/ j9 o; n6 c8 T/ g
position of deadwood reflflects the complementary roles played by fungi and bacteria. 4 @! P$ f& A! o! w! [Fungi were found to dominate the decomposition of deadwood and particularly its re v: H" ^& _ a1 d# `calcitrant fractions, while several bacterial taxa participate in N accumulation in dead 2 W2 ]( x9 Z2 {$ W# z0 Q) hwood through N fifixation, being dependent on fungal activity with respect to deadwood0 o6 {+ c3 r. l3 ^- g
colonization and C supply. Conversely, bacterial N fifixation helps to decrease the con : [ J/ b r: Dstraints of deadwood decomposition for fungi. Both the CO2 efflflux and N accumulation+ J& i7 U' Q# e, m# p _
that are a result of a joint action of deadwood bacteria and fungi may be signifificant for( h; b1 \2 n0 {. t! K+ x+ P
nutrient cycling at ecosystem levels. Especially in boreal forests with low N stocks, dead1 F/ J' `$ C; I2 N& u# y6 {/ W2 ]# E" c
wood retention may help to improve the nutritional status and fertility of soils., B' {& }% I2 r! H) t- e `9 F
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