长江口南汇湿地植被的光谱吸收特征研究

Studyon spectral absorption characteristics of vegetation in Nanhui Wetland of Yangtze River Estuary

植被的光谱吸收特征与植被生长状况密切相关,同时也受土壤湿度等外界因素影响。本文以长江口南汇湿地典型植被芦苇、互花米草和海三棱藨草为研究对象,在计算其光谱特征参数的基础上,分析了这3种植被的光谱吸收特征形变PSDI值。最后结合实测的土壤湿度,分析了3种植被的PSDI值和土壤湿度的相关性。研究结果发现:互花米草的PSDI值最大,海三棱藨草的PSDI值最小,芦苇介于两者之间,表明互花米草受外界的环境影响较大;互花米草的PSDI值与土壤湿度的相关性最大,芦苇的PSDI值与土壤湿度的相关性最小,海三棱藨草介于两者之间,表明互花米草适应湿地环境能力较强。

The spectral absorption characteristics of vegetation are not only closely related to the growth of vegetation,but also affected by soil moisture and other factors.In this study,Phragmites australis,Spartina anglica and Scirpus mariqueter were taken as the research objects,which are the typical vegetation in Nanhui Wetland of Yangtze River Estuary.Based on the calculation of spectral characteristic parameters,their spectrum of absorption and deformation of PSDI values were analyzed.Finally,combining with the measured soil moisture,the correlation between PSDI values of three kinds of vegetation and soil moisture values were analyzed.The results show that the PSDI value of Spartina anglica is maximum,the PSDI value of Scirpus mariqueter is minimum,and that of Phragmites australis is somewhere in between.It indicates that Spartina anglicais most affected by environment.The correlation between PSDI of Spartina anglica and soil moisture is maximum,the correlation between PSDI of Phragmites australis and soil moisture is minimum,while that of Scirpusmariqueteris somewhere in between.This points that Spartina anglica has stronger adaptability to wetland environment.