合肥蜀山森林公园马尾松林松材线虫病危害后 土壤溶解性有机碳氮与养分的变化

以合肥蜀山森林公园松材线虫病危害后的马尾松林为研究对象,对不同受损程度(轻度和重度)的马尾松林土壤溶解性有机碳(DOC)和氮(DON)及土壤养分的动态变化进行了研究。结果表明,不同受损的马尾松林土壤N、P、NO3--N和AP含量均随土层深度的增加而减少,而K、Ca、Mg含量则相反。经方差分析,重度受损林分土壤的NH4+-N和NO3--N含量显著高于轻度受损林分,而土壤的K、Ca、Mg含量表现为轻度受损林分显著高于重度受损林分。不同受损的马尾松林土壤DOC和DON含量均随土层深度的增加而逐渐下降,且在同一土层内重度受损林分均略高于轻度受损林分。相关性分析显示,重度受损林分土壤DOC和DON含量分别与土壤N、P存在极显著的正相关,与AP存在显著的正相关,同时分别与Ca、Mg含量存在着不同程度的负相关性。轻度受损林分土壤DOC含量分别与N、P、NO3--N之间存在极显著的正相关,与Mg存在极显著的负相关;DON含量仅与Ca、NO3--N存在不同程度的显著相关。

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.