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秦岭锐齿栎林、油松林和华山松林 (包括 0～ 60cm土层 )营养元素总贮量达 2 9 2 50 0～ 390 1 739t·hm-2 ,其大小为锐齿栎林 >华山松 >油松林 ,土壤中营养现贮量占系统总量的 93 1 0 %～ 99 39% ,植被层和凋落物层仅占 0 57%～ 3 0 0 %和 0 1 0 %～ 1 99% ;3林分乔木层生物量、木材蓄积量和营养元素积累量平均值分别为 1 2 0 4 83t·hm-2 、1 2 9 384m3·hm-2 和 1 2 2 6 9kg·hm-2 ,锐齿栎林 >油松林 >华山松林。 3林分林下植被层生物量现存量和营养元素积累量平均值分别为 1 553t·hm-2 和 53 1kg·hm-2 ,锐齿栎林最大 ,华山松林最小。林下凋落物现存量和营养元素积累量平均值分别为 1 7 4 75t·hm-2 和 50 2 5kg·hm-2 ,3林分凋落物现存量、营养元素含量及其积累量都存在明显的差异。锐齿栎林、油松林和华山松林营养元素年吸收量、归还量、存留量和平均归还率分别为 334 4、1 4 7 2和 2 64 3,1 95 5、66 9和 84 1 ,1 38 8、80 4和 1 80 2kg·hm-2 和 0 585、0 4 54和 0 31 8,3林分各营养元素的年吸收量、归还量和存留量也存在一定的差异。锐齿栎林干和皮中Ca和Mg含量远远高于油松林和华山松林的 ,锐齿栎林多代连作势必导致营养元素的大量流失 ,特别是Ca和Mg ,会破坏土壤原有离子动态?
The total nutrient storage in Qinling Sharptooth oak forest, Pinus tabulaeformis forest and Pinus armandii forest (including 0 ~ 60cm soil layer) reached 29250 0 ~ 390 1 739t · hm-2, and the size of them was Sharptooth oak forest> Pinus armandii> In Pinus tabulaeformis and Pinus tabulaeformis, the total amount of nutrients in the soil is 93 10% to 99 39% of the total system, while the vegetation layer and litter layer only account for 0 57% -300% and 0 1 0% -1 99%; 3 The mean values of biomass, wood volume and nutrient accumulation in the arbor layer were 1 2 0 4 83 t · hm -2, 1 2 9 384 m 3 · hm -2 and 1 2 269 kg · hm -2, Quercus mongolica> Pinus tabulaeformis> Huashan pine forest. The mean values of available biomass and nutrient accumulation in understory vegetation layer were 1 553 t · hm-2 and 53 1 kg · hm-2, respectively, with the largest in Quercus aliena var.mongolica and the smallest in Pinus armandii. The average values of litter standing stock and nutrient accumulation were 1 7475 t · hm-2 and 50 25kg · hm-2, respectively. The litter standing stock, nutrient content and accumulation of 3 litters were significant The difference. The annual uptake, return, storage and average return rates of nutrient elements in Pinus taiwanensis, Pinus tabulaeformis and Pinus armandii forests were 334 4,1 4 7 2 and 2 64 3,1 95 5,66 9 and 84 1, 1 respectively There were also some differences in annual uptake, return and storage of 38 8, 80 4, and 1 80 2 kg · hm-2 and 0 585, 0 544 and 0 31 8, 3, respectively. The contents of Ca and Mg in trunk and skin of Quercus variabilis were much higher than those in Pinus tabulaeformis and Pinus armandii forests. The intercropping of sharptooth oak forest would lead to the loss of nutrients in large quantities, especially Ca and Mg, destroying the original ions dynamic?