寧南黃土區(qū)典型人工林土壤生態(tài)化學計量特征

SoilEcological StoichiometryCharacteristicsof Typical Plantation inLoessRegionof Southern Ningxia

WANG Yue-ling1， XU Hao2， AN et al（1. Institute of Forestry and Grassland Ecology，Ningxia Academy of Agriculture and Forestry Sciences，Yincuaningia2.GuyanBrach，ingiacadfgicltureandrestiecs，uyaningi60） Abstracteilosofieptatiololocalricaracetndealth lawfsoilutrientsintypicalartifalplantationosystesinessgofsoingia.MetdSitycalplantatioets （PruusibiicforstsdostagnasstodefusCg shii，Prunussiicappherhmdes）ofPengangZnguangsallwatesdinelossgioofsoutNgiawreselecteds the research objects，and soil samples were collected from 0-20，>20-40，>40-60，>60-80，>80-100cm ，respectively. The contents of organiccarbon（SOC），otaltrgn（T），otalposous（T）dotaloai（K）inirentsoilayesredeteiddr stoichiometricratioswereanalyzdResultesolutrientcontentwasiuencdbyteforesttypeandsoillar，andterewersigificantdiferencesinsoilutrientsongdifrentforeststads，with“sufceagegationOCndsowdaeceasingtrdthin creasing soil depth，while TP and TK showed weaker changes with soil depth.The nutrient contentof Caragana korshinski forest was the highestamong the six forest stands.Thesoil SOC content wasata“deficient”or“slightly deficient”level，and the soil TP content was at a “slightly deficient”level，indicating that SOC and were limiting elements.The differences in soil C：N ， and N：K among different forest stands were not significant，while the C：P ratio of Prunus armeniaca × Caragana korshinskii forest was significantly higher than that of other foreststads.eoelatiotwensoilutrentcontetandoogicalstometryindifentfreststadsasiconsstol C：P and （20 C：K were greatly affected by soil SOC， C：N，N：P and N：K were most affected by TN，and P：K was most affected by TP.[Conclusion] Theresearchresultsprovidetechnologicalsupportfortherestoratioandsustainablemanagementofplantationvegetationintheregion. Key wordsPlantation；Soil nutrients；Ecologicalstoichiometry；Change characteristics；Loess regionofsouthem Ningxia

生態(tài)化學計量學是一門研究生態(tài)系統(tǒng)內部能量與碳（C）、氮（N）、磷（P）等化學元素之間動態(tài)平衡及元素平衡對生態(tài)交互作用影響的理論科學[1]，其特征反映土壤養(yǎng)分貯存和供應能力及養(yǎng)分動態(tài)，對土壤生態(tài)系統(tǒng)修復與保護具有重要指導意義[2]。（剩余13448字）