The Physico-chemical Properties Of Wood Debris Of Main Species In A Typical Mixed Broadleaved-Korean Pine Forest

Wood debris(WD)is an important component of forested ecosystems,serving as a habitat and food resource for animals,plants and microorganisms,storing nutrients,energies and water.Therefore,WD can be as geomorphic agent that regulates the flow of water and movement of sediments.In order to more reasonable evaluation nutrient content and the variation of productivity for forest ecosystem.WD of the main tree species-Pinus koraiensis,Abies nephrolepis,Betula costata,Acer spp.,Tilia spp.,Fraxinus mandshurica,and Ulmus spp.were chosen in a typical mixed broadleaved-Korean pine forest,Xiaoxing'an Mountains,Northeast China in this study.The WD was divided into 5 decay classes(?-?),and we sampled 3 diameter classes(?-?)for each decay class.To explore the effects of decay classes and diameter classes on carbon(C),nitrogen(N),phosphorus(P),lignin,cellulose,moisture content and wood density for intraspecific WD;And the difference of physico-chemical properties among species,the difference of physico-chemical properties between coniferous and broad leaf.The results showed that:(1)With the increase of decay classes of WD,the moisture content and the content of C and lignin of WD increased,wood density and the cellulose decreased.The content of N and P increased first and then decreased of WD for most species.But the physico-chemical properties were no significantly difference among diameter classes for intraspecific WD for most species.(2)Except for the decay class I,the moisture content and wood density of sapwood and heartwood of WD were significantly difference among species on other decay classes(P<0.05).Except for the lignin and P content of decay class II,III of sapwood,the content of C,N,P,lignin and cellulose of WD were significantly different among species on other decay classes(P<0.05).Except for the C of decay class I and the C and P of decay class III of heartwood,the content of C,N,P,lignin and cellulose of WD were significantly different among species on other decay classes(P<0.05).The moisture content and wood density were significantly different among species on most diameter classes(P<0.05).Except for the lignin of diameter class i and the P content of diameter class ii and the content of P and lignin of diameter class iii,the content of C,N,P,lignin and cellulose of sapwood were significantly difference among species on other decay classes(P<0.05).Except for the content of P and lignin of diameter class i and the P content of diameter class iii of heartwood,the content of C,N,P,lignin and cellulose were significantly difference among species on other diameter classes(P<0.05).(3)The relationships among chemical contents of WD were expressed as:The C of WD had a significant positive correlation with lignin content(P<0.05),had a significant negative correlation with N(P<0.05).The content of N of WD had a significant positive correlation with P(P<0.05).The lignin had a significant positive correlation with cellulose(P<0.05).(4)Moisture content in sapwood and heartwood of WD was expressed as coniferous higher than broad leaf,and had no siginificant difference for most decay and diameter classes.The content of C and lignin in sapwood and heartwood of WD was expressed as coniferous significantly higher than broad leaf(P<0.05),and wood density and the content of N,P and cellulose in sapwood and heartwood of WD was expressed as coniferous significantly lower than broad leaf for most decay and diameter classes(P<0.05).