宁南黄土区典型人工林土壤生态化学计量特征

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

生态化学计量学是一门研究生态系统内部能量与碳（C）、氮（N）、磷（P）等化学元素之间动态平衡及元素平衡对生态交互作用影响的理论科学[1]，其特征反映土壤养分贮存和供应能力及养分动态，对土壤生态系统修复与保护具有重要指导意义[2]。（剩余13448字）