河西走廊中部人工梭梭林群落生物量和碳储量研究OA

Haloxylon ammodendron is an extremely drought-tolerant constructive species in arid regions of northwestern China.Studying its community biomass and carbon sink function is of great significance.Taking the artificial Haloxylon ammodendron forest in the central part of the Hexi Corridor as the re-search object,the biomass of the Haloxylon ammodendron community,the carbon content of each organ,and the soil organic carbon content were systematically measured under different forest age gradients(5,10,15,20,25 years)through plot selection and plot investigation.The biomass and carbon storage status of the artificial Haloxylon ammodendron community at different forest ages were analyzed.The results showed that:(1)The biomass of individual plants in the artificial Haloxylon ammodendron forest showed a trend of first increasing and then decreasing with increasing forest age,reaching its peak at 20 years old(11.28 kg∕plant),and then significantly decreasing.(2)Bark and trunk are the main organs for carbon fix-ation,and their carbon content shows a net accumulation trend with increasing forest age,while roots,branches,and leaves exhibit carbon cycling characteristics.(3)As the age of the Haloxylon ammodendron forest increases,the surface soil organic carbon content shows a trend of first increasing and then decrea-sing,reaching its maximum at 15-20 years of forest age.However,in deeper soil layers,there is no regular change in soil organic carbon content with forest age,and the soil organic carbon content is mainly concen-trated in the 0-50 cm soil layer,showing a surface aggregation phenomenon.(4)The total carbon storage of each carbon layer in the artificial Haloxylon ammodendron forest ecosystem at different age levels showed a trend of first increasing and then decreasing,reaching its maximum at the age of 15 years;The main body of carbon storage in artificial Haloxylon ammodendron forests is the vegetation layer,followed by the litter layer,with only a very small portion distributed in the soil layer;The total carbon storage of artificial Haloxylon ammodendron forests of various age groups is 1.180 12 million t.In the future,forest density should be regulated to fully utilize the growth characteristics of Haloxylon ammodendron,extend the carbon accumulation stage at the medium age(15-20 years old),and promote litter decomposition to increase soil carbon storage,thereby increasing the total carbon storage of artificial Haloxylon ammoden-dron forests and maintaining ecosystem carbon balance.