不同密度红苞木幼林的土壤理化性质研究

为了合理利用土壤资源,用常规方法测定了不同密度红苞木幼林的土壤物理化学性质。在4种密度林分(1667,2500,4444,10000株/hm2)中,10000株/hm2的林分土壤容重大,通气性差。2500株/hm2林分的土壤有机质、氮、磷和钾含量高,对土壤的效果优于其它密度的林分;4444株/hm2林分土壤的有机质和氮含量较高,磷含量中等,钾含量高,有利于土壤养分的积累;1667株/hm2林分的土壤有机质和氮含量中等、磷含量高、钾含量较低,改善土壤磷的作用明显。10000株/hm2林分土壤的有机质、氮、磷、钾含量均低,不利于养分积累。

Soil Fertility in Young Rhodolcia Championii Stands of Different Densities

Soil physical and chemical properties in Rhodolcia championii stands with different densities(1 667,2 500,4 444,and 10 000 trees/hm2)were determined using conventional methods to utilize soil resources reasonably.Compared with other stands,soil bulk density in the stand of 10 000 trees/hm2 was great and its aeration ability was weak.Contents of soil organic matter,N,P,and K in the stand of 2 500 trees/hm2 were high among the four stands,indicating that its effect on soil improvement was better than the other stands.In the stand of 4 444 trees/hm2,soil organic matter and N contents were relatively high,P content was medium,and K content was high.The result indicated that the stand was favorable for soil nutrient accumulation.In the stand of 1 667 trees/hm2,soil organic matter and N contents were medium,P content was high,and K content was relatively low.As a result,the stand significantly improved soil P condition.Contents of soil organic matter,N,P,and K in the stand of 10 000 trees/hm2 were low,which indicated that the stand was unfavorable for soil nutrient accumulation.