苏北滨海废黄河口互花米草人工植被贮能动态

THE DYNAMICS OF ENERGY CONTENT IN ARTIFICIAL VEGETATION OF SPARTINA ALTERNIFLORA IN BINHAI COUNTY, JIANGSU PROVINCE

１９９０年苏北滨海废黄河口互花米草人工植被所测热值年变化呈“Ｍ”曲线，于５月和９月出现两个峰值．贮能与生物量变化大致趋同，而且与某些矿质元素含量的变化有一定关联；相关性分析表明，该植物地上部热值与Ｆｅ、Ｍｎ含量变化呈显著正相关，而地上部贮能则与Ｃａ、Ｍｇ、Ｓｒ的含量变化呈显著正相关．互花米草植物群落生物量大，贮能高；９月测得生物现存量为５６００ｇ·ｍ－２（ｄｗ），贮能为２３×１０６ｃａｌ·ｍ－２，是一种开发潜力很大的盐沼资源植物．

Spartina alterniflora, an impiortant salt marsh plant with high ecological-economic benefits, was introduced from America in 1980 and has already devoloped nearly 10,000 ha. in the tidal land of China. S. alternifiora salt marshes are not only important nursery grounds and sources of nutrients for aquatic organisms, but also provide food and habitat for wildlife, reduce shoreliine erosion and assimilate excess nutrients from pollutants such as sewage and agricultural drainage. To develop this plant'spotential use, especially for food utilization, we designed this research on the dynamics of energy content in the plant and report the initial results as follows:1990, the annual Change of the calorific values of Spartina alternifiora artificial vegetation at the Estuary of Old Yellow River in Binhai County, Jiangsu Province showed a curve as “M ”, and two high values were in May and September. The seasonal dynamics of energy content in the vegetation is related to a series factors. Generally speaking, the change of energy content followed the biomass, and had a proper correlation with some elements. The relativity analysis showed that the calorific values of the aboveground part were significantly positive-relative to Fe, Mn content and the energy content of the aboveground part was significantly positive-relative to Ca, Mg and Sr. S. alterniflora has high biomass and energy content, e. g. they were respectively 5600 g. m-2(dw), 23×106 cal· m-2 in September and were more than that of Zea mays and Helianthus annuus. So we can say, S. alterniflora is a salt marsh resource plant which has developental potential.