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AM真菌在生态系统中的作用! @: O; ?1 i7 U2 q7 ^
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' m, X L* {8 ?6 W4 R6 a/ {Forests accumulate and store large amounts of carbon (C), and a sub7 r$ \5 j: T2 l- t& ~3 S$ ]
stantial fraction of this stock is contained in deadwood. This transient pool is subject& S) x- R9 S/ E% b+ e$ N3 {
to decomposition by deadwood-associated organisms, and in this process it contrib [1 l" k$ Z* ?( q' Z/ f# q% |utes to CO2 & K y* E5 N. q: j1 {) Hemissions. Although fungi and bacteria are known to colonize dead ) k8 _' j, M9 G u7 W. Cwood, little is known about the microbial processes that mediate carbon and nitro% G) s6 H# z( X
gen (N) cycling in deadwood. In this study, using a combination of metagenomics, 7 n* Y* y% y2 U- A/ ?% pmetatranscriptomics, and nutrient flflux measurements, we demonstrate that the decom( k5 X* T. f2 K+ b
position of deadwood reflflects the complementary roles played by fungi and bacteria.0 R8 A% W- t) L/ l9 Y
Fungi were found to dominate the decomposition of deadwood and particularly its re 4 ^5 K& u0 s# Wcalcitrant fractions, while several bacterial taxa participate in N accumulation in dead 4 V o# b' L$ @: Awood through N fifixation, being dependent on fungal activity with respect to deadwood/ Q* d Y) j6 U0 d1 [. h$ Q
colonization and C supply. Conversely, bacterial N fifixation helps to decrease the con 9 Y# J1 _& h0 q* \straints of deadwood decomposition for fungi. Both the CO2 efflflux and N accumulation: y; J# }. J3 v
that are a result of a joint action of deadwood bacteria and fungi may be signifificant for. f8 |; J# F7 z" C/ w$ T7 i, a" `4 _
nutrient cycling at ecosystem levels. Especially in boreal forests with low N stocks, dead) ~; H& b! J4 M4 V) _3 D
wood retention may help to improve the nutritional status and fertility of soils.0 p/ e z. \' ` t; S, g
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发表于 2021-2-5 07:42
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