Eco-stoichiometric Characteristics Of Carbon,Nitrogen And Phosphorus In Forest Soils And Microbes In Henan Province

Redfield stoichiometry is the atomic ratio of carbon,nitrogen and phosphorus found in phytoplankton and throughout the deep oceans.There may also be a similar relationship between organisms and soil environment in the terrestrial forest ecosystem,which may affect the accumulation of soil organic carbon.The paper,taking the Taihang Mountain?TH?of Henan Province,Funiu Mountain?FN?,Dabie Mountain?DB?as the subject investigated,collected soil samples in 90 plots of sample area in TH,FN and DB forest areas to measure the contents of soil carbon,nitrogen,phosphorus and microbial carbon,nitrogen and phosphorus,and calculate the stoichiometric ratios of carbon,nitrogen and phosphorus.At the same time,the controlling experiment of soil organic carbon transformation by forest litter added with nitrogen and phosphorus are set.The paper studies the ecological stoichiometric characteristics of typical forest soils and microorganisms in Henan Province and explores the effects of exogenous nutrients on the content of organic carbon in litter decomposition and transformation.The main conclusions are as follows:?1?The content of soil carbon?C?,nitrogen?N?,phosphorus?P?in typical Forest regions of Henan Province differs significantly in content?P<0.05?.The C content in TH forest area is significantly higher than that of FN and DB forest area,but there is no significant difference between FN and DB forest area.The N content of TH forest is significantly higher than that of FN and DB forest areas,similar to that of C.And there is no significant difference between FN and DB forest regions.There was no significant difference in P content in the three forest areas.The contents of carbon,nitrogen and phosphorus in the forest soil of Henan Province are all at a low level among the national levels.There is no significant difference in the ratio of soil C:N,C:P,N:P and C:N:P between different forest regions.The average value of C:N:P is 64:5:1,which was also well-constrained.?2?The content of microbial biomass carbon?MBC?,microbial biomass nitrogen?MBN?,microbial biomass phosphorus?MBP?in typical Forest soils of Henan Province differ significantly.The MBC content in the forest area is significantly higher than that in FN and DB forest area,and there is no significant difference between FN and DB.The content of MBN is also the highest in TH forest area and the lowest in DB forest area,but there was no significant difference between TH and FN,but significant between TH and DB.The change of MBP content is different from the above.FN content is the highest,but there is no significant difference between the three forest areas.There is no significant difference in the stoichiometric ratios of microbial carbon,nitrogen and phosphorus among different forest regions,the variation of which is similar to that of soil carbon,nitrogen and phosphorus,and has a weak homeostasis mechanism with a ratio of 29:3:1.The correlated analysis shows that the effects of microbial carbon,nitrogen and phosphorus contents and their corresponding stoichiometric ratios are different in different forest areas.?3?The soil organic carbon content in different forest regions increases with the addition of exogenous nitrogen and phosphorus nutrient components.The correlated analysis shows that the correlation between carbon and nitrogen is higher than that between carbon and phosphorus.The increase of soil organic carbon is not significantly different from that of forest soil,and the average increment of soil organic carbon is 4.1 times of that of N₀ treatment under N₂treatment.?4?In different forest regions,the addition of exogenous nitrogen and phosphorus nutrients significantly affects the soil microbial carbon content.At N₀concentration,microbial carbon content is 418 mg·kg^-1;after the treatment of N₁concentration,it increased to 883 mg·kg^-1;after the treatment of N₂ concentration,it increases to 1360 mg·kg^-1.The increase of microbial carbon content is also significant among different soil types.