In this study,three different ages of Larix principis-rupprechtii forests in 5,10 and 20 years were selected as the research objects,and the changes in soil nut
Using the sediment monitoring data of five sections of the Xiling Channel inland waterway of the Pearl River Delta,and using Nemerow composite index,the coeffic
With the rapid development of the city,the old city has gradually lost its former glory,and the old community accounts for a large proportion in the city,and is