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选择闽江口鳝鱼滩不同淹水环境下两条样带(A样带,远离主潮沟且退潮后无积水;B样带,靠近主潮沟且退潮后有积水)上的短叶茳芏湿地和已被互花米草入侵(入侵前为短叶茳芏湿地)的互花米草湿地为研究对象,探讨不同类型湿地土壤无机硫赋存形态的分布特征及其主控因素.结果表明,B样带上互花米草湿地和短叶茳芏湿地土壤中的水溶性硫(H_2O-S)和吸附性硫(Adsorbed-S)含量总体上低于A样带,而盐酸可溶性硫(HCl-Soluble-S)和盐酸挥发性硫(HCl-Volatile-S)含量则高于A样带.短叶茳芏湿地和互米草湿地土壤中不同形态无机硫的含量在两条样带上整体均表现为HCl-Soluble-S>H_2O-S>Adsorbed-S>HCl-Volatile-S,且二者的总无机硫含量分别占其TS含量的9.02%~15.50%和8.04%~12.73%.与短叶茳芏湿地相比,互花米草入侵分别使A样带土壤中H_2O-S、Adsorbed-S、HCl-Soluble-S、HCl-Volatile-S和总无机硫含量减少了35.2%、36.4%、16.8%、1.8%和26.12%;但使B样带表层土壤的总无机硫含量及0~20 cm土层的HCl-Soluble-S和HCl-Volatile-S含量分别增加了8.34%、15.34%和5.71%.研究发现,非长期淹水条件下,互花米草入侵后可降低湿地土壤有效硫的供给能力;长期淹水条件下,互花米草入侵可通过提高土壤中HCl-Soluble-S的含量增加金属硫化物沉淀,而挥发性硫含量的同步增加则可能对植被生长(特别是根系发育)产生不利影响.
The results showed that the water quality of two transects (A transect, ecliptic fissure far away from the main tidal channel and no ebb after ebb tide) in the eel beach of Minjiang estuary was short Spartina alterniflora wetland and Spartina alterniflora wetland that had been invaded by Spartina alterniflora (pre-invader wetland) were studied to investigate the distribution characteristics of inorganic sulfur in different wetland soils and its controlling factors The results showed that the contents of water-soluble sulfur (H 2 O-S) and adsorbed sulfur (Adsorbed-S) in soil of S-type Spartina alterniflora and Short-leaf moss wetlands were generally lower than those of A-like samples, The content of soluble-sulfur (HCl-Soluble-S) and hydrochloric acid-soluble volatile sulfur (HCl-Volatile-S) was higher than that of sample A. The content of different forms of inorganic sulfur in the soil of short- The total inorganic sulfur content of the two samples respectively accounted for 9.02% -15.50% and 8.04% -15% of the TS content, respectively, in the sample zone as HCl-Soluble-S> H_2O-S> Adsorbed-S> 12.73% .In contrast to the short-leaf mulberry wetland, Spartina alterniflora invasion decreased the contents of H 2 O-S, Adsorbed-S, HCl-Soluble-S, HCl-Volatile-S and total inorganic sulfur 35.2%, 3 6.4%, 16.8%, 1.8% and 26.12% respectively. However, the total inorganic sulfur content in soil of B zone and the content of HCl-Soluble-S and HCl-Volatile-S in 0-20 cm soil layer increased by 8.34% 15.34% and 5.71%, respectively.The results showed that S. alterniflora invasion could reduce the supply of available sulfur in wetland under the condition of non-long-term flooding. Under the conditions of long-term flooding, S. alterniflora invasion could be improved by increasing the content of HCl- The content of Soluble-S increases the precipitation of metal sulfides, while the simultaneous increase of volatile sulfur contents may adversely affect the growth of vegetation, especially root development.