1. Remark:(1)The cost ofseeding、soil preparation、clearance ofweeds、fertilization、implantation、repair planting、tending and fertilizers etc is included in afforestation cost, the plantations are tended l time in the afforest first year and thesame thing had been done in the next year; (2)The land rent which is 225 yuanhm-2a-1 and the cost of pest control and fire proof which is 75yuanhm-2a-1 are included in the fixed cost; (3)The plantation is managed aS the sprout forest after catastrophe, the plantations are tended 1 time in the year of disaster and the same thing had been done in the next year.
桉树速生用材林营林成本因地点和经营者的不同而有所差异，为方便进行经济效益评价，经咨询江西赣州金太阳科技林业有限公司、湖南永州林业局、广东连州市林业局和广西来宾市林业局的有关人员，结合华南地区桉树人工林造林成本，本研究的经营成本统一确定如下(表2)。注：(1)造林费用包括造林当年的种苗、清山，除杂、整地、施肥、栽种、补植、当年的抚育以及肥料等人、财、物的投入；在一个轮伐期中，造林当年抚育一次，次年抚育1次；(2)年固定费用包括：土地租金按225元hm-2a-1计算，护林防火、病虫害防治等费用按75元hm-2a-1计算；(3)林分受灾后作萌芽林经营，受灾当年抚育一次、次年抚育一次。
2. The purpose of the choice of fixed land-rent was to reduce the cost and risk of the government.
宋代系官田产的定额地租剥削高于唐代，选择定额租是为了降低官府的经营成本、规避风险；