| The radiation energy distribution of Zanthoxylum bungeanum ash tree crown were studied in the condition of covering film,straw pole and Trifolium repens on the ground of Z.bungeanum.The results showed that the solar total radiation and the net radiation increased with the height,but the reflecting radiation decreased.The total radiation below the tree crown of covering plastic film,straw pole and T.repens on the ground were decreased by 13.6%,6.4%, 11.3% than those of control test respectively.The reflecting radiation below tree crown from ground increased by 66.3%,21.4% and 35.6% by covering plastic film,planting T.repen and covering straw pole than that of control test,and the reflecting radiations below the tree crown from ground were higher than that of middle tree crown obviously.The vertical distribution tendency of net radiation in the tree crown were unanimous on the different covering methods,and the net radiation increased according to the index law with the rising of height. |