Preliminary Study For Planting Density And Harvesting Time Of Robinia Energy Forest In Several Regions

In this paper,through its general black locust(Robina pseudoacacia L) trial plantation in Luoning, Henan Province in Central—China and tetraploid black locust trial plantation in Beijing Yanqing in North—China,we Carried out a comparative test including four-density,three harvesting cycles and three stubble heigh,and investigated 3 growth—year of general black locust secondary plantation in Chengde Hebei Province.We have done a comparative analysis of different density and cutting cycle as impact indicators for article sprout number of the black locust,diameter,tree height,biomass per unit area,calorific value,dry matter content We put forward a new concept named Heat per unit area at an average annual,to quantify the ability of energy,production The definition of formula is:Heat per unit area at an average annual=Calorific value×biomass×dry matter content/(area×cutting cycle).Experiments found that the number of article sprout of black locust dropped gradually since the tree seeding had been stumpped before the test observation was conducted;calorific value is relatively stable.The experimental program of black locust Luoning,planting density of 0.4m×0.6m, stubble height of 30cm,one-year rotation,obtains the maximum Heat per unit area at an average annual 83495.3KJ/(m~2·year),significantly higher than that of other programs,and even is several times more than some of other experimental programs.In the Yanqing tetraploid black locust experimental programs,the program of density of 0.8m×1.2m,stubble height of 30cm,crop-ping of the program after the one-year-old,got he largest average annual heat per unit area 9418.127KJ/(m2·years),is slightly higher than other tetraploid black locust Yanqing pilot programs..In Chengde, thereis a natural common locust secondary of density of 1m×2m approximately,the pilot program of Harvesting time for two-year got the largest Heat per unit area at an average annual 3720.424KJ/ (m~2·year),is slightly higher than other common black locust Chengde Experimental secondary programs.