吕梁山区3种人工林植被、凋落物生物量差异特征及其与土壤养分的关系

Difference Feature of Planted Vegetation Biomass and Litter Biomass for Three Plantations and Their Relationship with Soil Nutrients in Lvliang Mountainous Region

通过样地调查和土壤样品采集分析的方法,测定了山杨、油松和辽东栎3种人工林林下植被(灌木、草本)的活地被的生物量以及地表凋落物的生物量和土壤养分的总概况,并探讨了它们之间的相关性。结果表明:活地被生物量表现为油松2.354 7 t·hm^(-2)>山杨2.078 5 t·hm^(-2)>辽东栎1.137 3 t·hm^(-2),地表凋落物生物量山杨4.797 5 t·hm^(-2)>辽东栎2.139 9 t·hm^(-2)>油松0.525 0 t·hm^(-2);林下土壤分级指标结果:有机质、全磷均呈现4~5级标准,全氮为1~3级标准;林下土壤养分含量分析比较结果:有机质含量为山杨>辽东栎>油松,而全氮和全磷为山杨>油松>辽东栎;同时分析了土壤全量养分与各林分下活地被生物量、凋落物层生物量之间的相关性,结果表明:3种人工林的3种全量养分与活地被生物量、凋落物生物量均呈现极显著相关(P<0.01),同时3种林分的土壤全量养分间相关性显著(P<0.05),表现出良好的协同效应。

Usingsample-plot surveyand soil sample analysis, wedetermined thegeneral situation ofwoody biomass （ WB）, litter biomass （LB） and soil nutrients （SN） including organic matter （ OM）, total nitrogen （ TN）, total phosphorus （TP） for three plants （Pinus tabuliformis, Populus davidiana, Quercus liaotungensis）, and analyzed the relationship between biomass（ WB, LB） and SN as well. The largest WB was that of P. tabuliformis（ 2. 354 7 t hm-2）, followed by P. davidiana（2. 078 5 t hm-2） and Q. liaotungensis（ 1. 137 3 t hm-2）. The largest LB was that of P. davidiana （4. 797 5 t hm-2）, followed by Q. liaotungensis （2. 139 9 t hm-2） and P. tabuliformis（O. 525 0 t hm-2）. The forest soil classification indicators were OM and TP with the standard level of 4 - 5 and 1 - 3, respectively. For the analysis and comparison result of forest SN, the largest content of OM was that of P. davidiana, followed by Q. liaotungensis and P. tabuliformis, while largest contents of TN and TP were P. davidiana, followed by P. tabuliformis and Q. liaotungensis. We also analyzed the correlation between SN and WB and LB, resulting in that the correlation of all three plants with a highly significant relation （P 〈 0.01 ）, and the correlation among OM, TN and TP of all three plants also was significant with a good synergistic effect（ P 〈 0.05 ）.