辽西地区不同人工林地土壤肥力变化研究

为研究辽西地区人工林对石灰性褐土土壤质量的定向改良作用,以油松×沙棘混交林、山杏纯林、油松纯林3种人工林地为研究对象,对在石灰性褐土上的人工林土壤肥力进行了分析。结果表明,油松沙棘混交林能够显著提高有机碳含量,比荒地高42.8%;油松沙棘混交林、油松纯林土壤碱解氮分别比荒地增加34.6%和33.6%,人工林对土壤全氮含量影响不显著;油松沙棘混交林的土壤速效磷和水溶性磷分别比荒地提高14.9%和128.57%;人工林增加了土壤速效钾含量;林木的改良土壤作用主要表现在土壤表层。

Studies on soil fertility of different artificial forest lands in West Liaoning

To research the directed amelioration effects of afforestation on calcareous cinnamon soil in west Liaoning,studies were conducted in Pinus tabulaeformis-Hippophae rhamnoides mixed plantation,Prunus sibirica pure plantation and Pinus tabulaeformis pure plantation,and the soil fertility were studied after afforeatation in calcareous soil.Result indicated that organic carbon content was enhanced remarkably in Pinus tabulaeformis-Hippophae rhamnoides and was 42.8%heigher than that in barren land.Contents of soil alkali-hydrolyzable nitrogen in Pinus tabulaeformis-Hippophae rhamnoides plantation and in Pinus tabulaeformis plantation were 34.6%and 33.6%higher than that in barren land,respectively.The effect of afforestation on soil total nitrogen content was unsignificant.Contents of available phosphorus and water-soluble phosphorus in soil of Pinus tabulaeformis-Hippophae rhamnoides plantation were 14.9%and 128.57%higher than that in barren lands.Soil available potassium content were enhanced by afforestation and the amelioration effects of afforestation was mainly in topsoil.