北亚热带森林土壤有效微量元素状况研究(英文)

Available Microelements in Soils under Different Stands in Northern Subtropics of China

研究了北亚热带 2 5 a生栓皮栎林、杉木林、火炬松林、毛竹林和 5年生 2代杉木萌芽林土壤中 B、Mo、Cu、Zn、Fe、Mn的有效含量、在土壤剖面中的分布规律、影响其有效性的土壤因子以及不同林分对土壤微量养分含量的影响。结果表明 ,在该地区的森林土壤中 ,有效 B,Mo,Cu的平均含量均低于各自临界值 ,有效 Zn平均含量接近临界值 ,Fe,Mn含量丰富 ;有效微量养分在土壤剖面中的分布因林分和元素种类而异 ;影响微量元素有效性的主要土壤因子为有机质和有效磷含量 ;不同林分对土壤有效微量元素含量有显著影响 ,栓皮栎林土壤中有效微量养分含量最高 ,2代杉木萌芽林最低 ,其余林分居中且基本接近。

Contents, distribution and influencing factors of available B, Mo, Cu, Zn, Fe and Mn in soils under the stands of oriental oak, Chinese fir, loblolly pine, moso bamboo and secondary sprouting Chinese fir in northern subtropics of China, and the influences of different stands on soil microelement availability have been studied. The research area was situated in Xiashu Forest Farm, Jurong, Jiangsu Province, where the soil is yellow\|brown soil derived from siliceous slope wash of sand stone. The results revealed that the average contents of available B, Mo and Cu in the region were much lower than their respective critical levels, mean content of available Zn was near the critical level and Fe and Mn were rich; microelements distribution in soil profiles varied with elements and stands; soil organic matter and available P were found to be the major factors influencing the availability of micronutrients; the contents of available micronutrients in horizontal soils under different stands varied significantly, with those under the oriental oak almost all the highest, those under the secondary sprouting Chinese fir the lowest and the rest moderate and similar.