闽江河口互花米草与短叶茳芏湿地土壤无机硫形态分布特征及其影响因素

发布时间：2018-04-05 18:10

  本文选题：无机硫形态　切入点：短叶茳芏湿地　出处：《环境科学学报》2017年12期

【摘要】：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-SH_2O-SAdsorbed-SHCl-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.
[Abstract]:Two transect A patterns were selected under different flooded environments in the eel beach in the mouth of Minjiang River, which were far away from the main tide trench and had no stagnant B pattern after the ebb tide.The short leaf marshland near the main tide trench and stagnant water after ebb tide, and the Spartina alterniflora wetland that had been invaded by Spartina alterniflora (before invasion) were studied.The distribution characteristics and main controlling factors of inorganic sulfur forms in different types of wetland soils were studied.The results showed that the contents of water soluble sulfur H2O-Sand Adsorbed-S) in Spartina alterniflora wetland and short leaf tibia wetland were lower than those in A transect, but the contents of HCl-Soluble-Sol and HCl-Volatile-Sol were higher than those in A transect.涓庣煭鍙惰尦鑺忔箍鍦扮浉姣，

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