三峡水库蓄水后消落带土壤有机质和氮磷含量及分布特征

The Distribution Characteristics of Soil Organics and Nitrogen Phosphorus Ingredients in Water——fluctuating Zones after the Impoundment of the Three Gorges Reservoir

2010年4月在三峡库区重庆段长江干流及部分支流的14个消落带采样点采集消落带土样,对有机质、全氮和全磷进行了测定,并对土壤的化学计量学特征进行了分析.结果表明,淹水过后消落带土壤有机质均值大于对照土壤.消落带植被覆盖状况对消落带土壤有机质和全氮含量变化影响较大,淹水前植被覆盖度高的消落带在落干初期土壤有机质和全氮含量高于对照土壤,而植被覆盖低的消落带土壤有机质和全氮低于对照土壤.消落带土壤全磷含量与植被覆盖度、土地利用类型均没有明显的关系.与对照土壤相比,消落带土壤C:N、C:P较大,N:P较小,消落带土样有机质和全氮含量呈现良好的线性拟合关系,表明两者有相同的来源.

Soil samples were collected in the 14 water-fluctuating zones in the main stream of Yangtze River in April, 2010, the organics, Nitrogen and phosphorus ingredients were detected, and the chemical measurement properties were analyzed. The findings reveal that the organics ingredients in soil after the impoundment are higher than thoseof the control soil. The vegetation coverage in water-fluctuating zones has great impetus on the soil organics and nitrogen ingredients. In the initial stages of water return, the soil organics and nitrogen ingredients in places with higher vegetation coverage before impoundment are higher than those of the control soil, and the soil organics and nitrogen ingredients in lower vegetation coverage is lower than those of control soil. The Phosphorus ingredients in water-fluctuating zones have not much to do with vegetation coverage and soil utility differences. Contrasting with the control soil, C：N, C：P in soil is higher and N：P is lower in water fluctuating zones. The organics and nitrogen ingredients in water-fluctuating zones are in a healthy fitting linear relationship, indicating they are of the same source.