Abstract:

In order to understand the effects of different plant arrangement modes on soil organic carbon storage and soil respiration in reclaimed coastal wetlands，a study was made to investigate the characteristics of soil carbon storage and soil respiration under three typical plant arrangement modes，i.e.，pure slash pine plantation (Pinus elliottii)，slash pine and Amorpha fruticosa mixed plantation，pure Amorpha fruticosa plantation which were planted for 8 years，bare as a control.Soil respiration was measured using LiCor 640009 soil chamber attachment，and soil organic carbon，soil bulk density，soil respiration and its major affecting environmental factors were monitored during that time.The result showed that:the rang of soil organic carbon storage in 0-40 cm soil layer was 296-691 kg/m2:Pinus elliottii+Amorpha fruticosa(PA)>Amorpha fruticosa(A)>Bare(B)>Pinus elliottii(P).The PA was beneficial to the sequestration of soil organic carbonas compared to other modles.The rang of mean soil was 274-519 μmol/m2·s:A>PA>P>B.Soil temperature was the key factor driving soil respiration.The differences of soil respiration in different modes maybe related to soil organic carbon storage and plant leaf area index.This study provides a scientific basis to increasing carbon sink by artificial afforestation in coastal reclamation areas