北京大兴沙地油松与国槐林木水肥耦合效应研究

Water and Fertilizer Coupling Effect of Pinus tabulaeformis and Robinia pseudoacacia in Sandy Land of Daxing,Beijing

北京位于中国北方,是超大城市。经济快速发展的同时,对土地资源和水资源的需求不断增加,土地沙化日趋严重,京津冀地区土壤沙化问题尤为突出。北京进行土地沙化治理以沙地造林为主要途径。该文在前人研究基础上,以沙地油松与国槐为试验材料,分析其对土壤水盐平衡、水分利用效率、植物生长曲线的影响及对区域适宜性水肥管理的影响。该文采用持续跟踪统计、现地调查等多种方式,因北京平原砂质土地水分贫瘠、生态林大苗在人工造林后的生长受到限制,运用裂区实验的方法,以国槐、油松为研究对象,选取4种不同灌溉等级的土壤和4种不同类型的有机肥料进行对比试验。对林木的理化性质、树高、胸径进行测量,并研究不同灌溉、施肥处理下生态林的叶绿素和叶质营养成分的变化。

Beijing is located in the north of China and isa mega-city in China.With the rapid economic development,the demand for land resources and water resources is increasing,and land desertification is becoming increasingly serious,especially in the Beijing-Tianjin-Hebei region.In terms of land desertification control in Beijing,afforestation on sandy land is the main way.Based on previous studies,this paper analyzed the effects of Pinus tabulaeformis and Sophora japonica on soil water and salt balance,water use efficiency,plant growth curve and regional water and fertilizer management.In this paper,based on the continuous tracking statistics,field survey and other methods,according to the poor water content of the sandy land in Beijing Plain,the growth of the large seedlings of the ecological forest is limited after artificial afforestation,the method of split zone experiment is used to select four different irrigation grades of soil and four different types of organic fertilizer for comparative experiments,taking Chinese Sophora japonica and Chinese pine as the research objects.The physical and chemical properties,tree height and DBH of the forest were measured,and the changes of chlorophyll and leaf nutrient composition of the ecological forest under different irrigation and fertilization treatments were studied.