Changes of dissolved organic carbon and nitrogen and other nutrients in soil of Pinus massoniana stands disturbed by pine wilt disease on Shushan Forest Park in Hefei
This study was conducted on a suburban forest park in Hefei.The changes of DOC,DON and other soil nutrients were studied in a Pinus massoniana forest disturbed by pine wilt disease.The results showed: with the increase of soil depth in the differently damaged stands,the total N,P,NO3——N and available P contents declined,while the contents of K,Ca and Mg increased.NH4+-N and NO3——N contents in soil were significantly higher in the seriously damaged stand than that in the slightly damaged one.However,the K,Ca and Mg contents were significantly higher in the slightly damaged stand than that in the seriously damaged stand.DOC and DON contents declined with the increase of soil depth in the differently damaged stands,and the seriously damaged stand showed a little higher contents than that in the slightly damaged one.The contents of DOC and DON in the seriously damaged stand were significantly and positively correlated with total N,P,and AP,while negatively correlated with Ca and K.The contents of DOC in the slightly damaged stand were significantly and positively correlated with N,P and NO3-N,and were negatively correlated with Mg.The content of DON had a significant correlation with Ca and NO3-N.