Study on Potential Productivity of Forestry Land in Huang Jiaercha Small Water Shed of Loess Hilly Area

In this paper,potential forestry land productivity in Huang Jiaercha small water shed of loess hilly area is analyzed,based on the evaluation of land fitness.With the Thornthwait Memorial Model,the climatic potential capability of productivity of the water-shed is calculated roughly.The results show that the climatic potential capability of productivity of arbor land is 12.75 m3/(hm2·a)and that of shrub land is 13 597.5 kg/(hm2·a).The present potential capability of productivity of arbor land is 4.80 m3/(hm2·a) and that of shrub land is 8 197.5 kg/(hm2·a) and is 38% and 60% of the climatic potential capability of productivity respectively.It is indicated that to plant shrub will make full use of the natural resources in the water-shed and furthermore,amongst the shrub,planting Robinia pseudoaeacia is better.It must be of great significance to guide the current productive and comprehensive management of small water-shed in loess hilly area.