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沙土覆盖和沉水植物措施对污染沉积物氮磷释放的影响
王小明,王刚,周本智,钟绍柱,孔维健,徐升华
1. 中国林业科学研究院亚热带林业研究所,浙江,富阳,311400
2. 浙江省富阳市水利局,浙江,富阳,311400
3. 浙江省富阳市林业局,浙江 富阳,311400
摘要:
采用沙土覆盖和疏浚疏松以改善疏浚表泥紧实度.研究了沉水植物重建和沙土覆盖等表层改良方式对污染湖泊底泥营养盐释放的组合控制效果.结果发现,对于未种植菹草处理,不同泥沙掩蔽方式在短期内均能显著降低沉积物中氮磷营养盐的释放速率,但随着时间的延长,氮磷释放速率有回复增加的趋势;而沉积物泥沙掩蔽后(表层覆盖5cm土,表层覆盖5cm细沙),同时进行菹草种植后发现,与未种植菹草空白相比较,氮磷释放速率均有明显的降低;不同改良方式间的比较结果发现,疏浚疏松后进行菹草种植对沉积物营养盐的释放控制效果最佳.
关键词:  沙土覆盖  沉水植物  沉积物  氮磷释放
DOI:
分类号:S714.7
基金项目:"十一五"科技重大专项"国家水体污染控制与治理"(2008ZX07103-003);国家自然基金项目"浅水湖聚藻区显黑质粒的物化特征及稳定性机制"(50979102)
Influences of Sand Mulching and Submerged Plant Recovery on Nitrogen and Phosphorus Release from Sediments
WANG Xiao-ming,WANG Gang,ZHOU Ben-zhi,ZHONG Shao-zhu,KONG Wei-jian,XU Sheng-hua
WANG Xiao-ming1,WANG Gang1,ZHOU Ben-zhi1,ZHONG Shao-zhu2,KONG Wei-jian1,XU Sheng-hua3(1.Research Institute of Subtropical Forestry,CAF,Fuyang,Zhejiang 311400,China,2.Fuyang Water Conservancy Bureau,3.Fuyang Forestry Bureau,China)
Abstract:
Two methods including tillage,sand and soil mulching were applied to reduce surface compaction of dredged sediment.The combining effects of submerged plant restoration and surface covering were tested in terms of controlling the release of the inner-loaded nutritional salts from contaminated lake sediment.The results show that different sand and soil coverage notably reduced nitrogen and phosphate release rates at the beginning of the experiments,but the release rates bounced back after a extended time period.With comparison of the control,the treatment of combining surface covering and plant restoration(growingPotamogeton crispus) significantly retarded release rates of nitrogen and phosphate.However,the treatment of combining tillage and plant restoration provided the superb release rate of inner-loaded nutrients.
Key words:  soil and sand mulching  submerged plants  sediments  release of nitrogen and phosphate