互花米草引种对苏北潮滩湿地 TOC 、TN和TP分布的影响
摘要
The influence,after introduction of Spartina alterniflora,on the distribution of TOC,TN and TP in tidal salt marshes in north Jiangsu Province,is analyzed.The result indicates that,the unit area accumulation of TOC,TN and TP within the depths of 0~20cm,as well as average horizontal and vertical contents of TOC and TN,in Spartina alterniflora marshes,are higher than those in other ecological zones,and decrease from Spartina alterniflora marshes to Artemisia schrenkiana marshes,Phragmiues auszradis marshes and silty marshes.While the highest average horizontal and vertical content of TP occurs in silty marshes,and the average content increases from land to sea. In autumn,the unit area accumulation content of TOC of Spartina alterniflora is 14.1 and 1.9 times that of Artemisia schrenkiana and Phragmiues auszradis,respectively.Similarly,the unit area accumulation content of TN of Spartina alterniflora is 32 and 1.6 times that of Artemisia schrenkiana and Phragmiues auszradis.The unit area accumulation of TP of Spartina alterniflora is also larger than that of Artemisia schrenkiana and Phragmiues auszradis,its content is respectively 56 and 3.9 times that of Artemisia schrenkiana and Phragmiues auszradis. The influences,after introduction of Spartina alterniflora,on the distribution of TOC,TN and TP in tidal salt marshes are:(1) The accumulating rate of Spartina alterniflora is high,which benefits the preservation of nutrient matter,and the increase of accumulation contents of TOC,TN and TP in the whole tidal salt marshes;(2) changes of plants distribution pattern in tidal salt marshes induced by Spartina alterniflora,accordingly heighten the accumulations of TOC,TN and TP in the whole ecosystem;(3)the high production and enormous belowground biomass of Spartina alterniflora,influence not only TOC,TN and TP cycling in the inner ecosystem,and the exchange between the adjoining ecosystem,but also accumulations of such three matters in the whole tidal salt marshes;and(4)Spa