摘要
以青海省黄土丘陵区16种林分类型为研究对象,通过对主要植被和林型土壤物理性质(土壤容重和孔隙度)和化学性质(有机质、氮、磷、钾)的测定与分析,研究了其林下土壤持水能力和土壤肥力状况变化。结果表明,混交林林下土壤容重的平均值最小,而林下土壤毛管孔隙度的平均值最大,说明混交林林下土壤表层疏松多孔,具有较高的水源涵养和水土保持功能。各植被类型土壤有机质、氮、磷、钾分布规律基本一致,均表现为:混交林>针叶林>阔叶林>灌木林>荒山荒坡,不同林分类型中华北落叶松林下土壤的氮元素含量最高,而磷钾含量相对偏少,青杨林林下土壤的磷元素含量最高,而氮钾含量相对偏少,白桦—糙皮桦—祁连圆柏—云杉混交林(5∶2∶2∶1)林下土壤的钾元素含量最高,而氮磷含量相对偏少。综合比较而言,混交林能很好地促进有机质、氮、磷、钾含量的增加,改善土壤养分状况,有利于土壤肥力的持续。
Taking sixteen forest types in the loess hilly area of eastern Qinghai Province as research objects,the main vegetation types and soil physical properties（soil bulk density and porosity）and chemical properties（organic matter,N,P,and K）are analyzed.The changes in soil water holding capacity and soil fertility are studied.Results show that mixed forest have the minimum soil bulk density and the largest soil capillary porosity,and the mixed forest soil is loosen and porous and has the higher capability of water conservation and soil conservation.The distributions of soil organic matter,N,P,and K for different vegetation types are consistent,following the order of mixed forest〉coniferous forest〉broadleaf forest〉shrub〉barren hills.In different forest types,soil in Larix principis-rupprechii forest has the highest N content,while P and K contents are relatively low.Soil in Populus cathayana has the highest P content,while N and K content are relatively low.Soil in Betula platyphylla Suk—Betulautilis—Sabina przewalskii—Ricea asrerata（5∶2∶2∶1）mixed forest has the highest K content,while N and P contents are relatively low.In terms of comprehensive comparison,mixed forest well promotes the increases in soil organic matter,N,P,and K contents,improves soil nutrient status,and helps to sustain soil fertility.
出处
《水土保持通报》
CSCD
北大核心
2010年第6期1-6,共6页
Bulletin of Soil and Water Conservation
基金
青海省林业局资助"青海省公益林生态效益监测"(横向合作项目)
陕西科技大学研究生创新基金
关键词
黄土丘陵区
水源涵养林
土壤理化性质
loess hilly region
water conservation forest
soil physical and chemical property
