Effect of litter nitrogen storage and nitrogen release of litter decomposition on soil nitrogen in Pinus koraiensis mixed forests
The influences of nitrogen storage and nitrogen release from decomposition in undecomposed litter layer (L),fermentation layer (F),humus layer (H) and surface soil layer (S)on soil nitrogen in spruce-fir-Korean pine mixed forest and birch-Korean pine mixed forest in Xiaoxing' anling Mountains were studied by the direct harvesting method from May to October of 2012.The results showed that during the period of study,the litter standing crops of two forest types were 19.43-27.25 and 21.25-24.28 t · hm-2,and nitrogen storage was 287.21-418.22 and 274.81-351.21 kg · hm-2,respectively.The nitrogen concentrations of different layers in two forest types were ranked in the decreasing order of L,F,H,and S.In spruce-fir-Korean pine mixed forest,both litter standing crop and its nitrogen storage in each layer peaked in May and September; monthly nitrogen storage increased from L to F layer; the nitrogen released from litter decomposition was easily enriched in F and H layers,but less leached into the soil.However,in birch-Korean pine mixed forest,both litter standing crop and its nitrogen storage in each layer peaked in May and October; nitrogen storage decreased from L to F layer; nitrogen was easily transported among all litter layers,and nitrogen transported from litter layer into the soil was more than that in spruce-fir-Korean pine mixed forest.In the two forest types,significant positive correlations were found between the litter standing crops (in L,F and H layers) and nitrogen in S lay er,between nitrogen in H layer and nitrogen in S layer,and between the litter standing crops (in L and F layers) and nitrogen in H layer.
国家科技期刊平台
NSTL
万方数据
维普
