Study of nitrogen (N) and phosphorus (P) in the land of mangrove sediments in ecotourism area Wonorejo Surabaya and coastal area of Jenu Tuban

The mangrove forest is one of the wealth of natural resources in Indonesia. Based on data from the Ministry of Environment in 2006 that the Indonesian mangrove forest area reached 4.3 million hectares. Nutrient element N (nitrogen) and P (phosphorus) is an element that affect the growth of mangroves. The element nitrogen affect amount of photosynthesis that occurs in mangrove. Low uptake of phosphorus can cause plant tissue volume becomes smaller and the leaf color becomes darker. This study aims to measure the concentration of nitrogen and phosphorus in soil sediments obtained from the mangrove Ecotourism Wonorejo Surabaya and coastal Jenu Tuban. This research uses descriptive method through field surveys by sampling. Sampling was carried out at six points in each region. The results of this study showed that the highest nitrogen content was at the point A4 coastal areas Jenu Tuban is 40.86%, while the lowest nitrogen content is at the point B3 Ecotourism Mangrove Wonorejo Surabaya is 31.55%. Phosphorous levels are at their highest A6 coastal areas Jenu Tuban is 0.043 ppm, while the phosphorus content is in the lowest point of the region B3 Ecotourism Mangrove Wonorejo Surabaya is 0,021 ppm.