佼木溪沟谷地貌与林木生长的探讨

AN APPROACH OF THE RAVINE LANDFORM AND FOREST GROWTH OF JIAOMU RIVULET

佼木溪位于武陵山腹地。境内沟谷纵横,岭脊镶嵌分布,由于山文结构、山体高度与幅度以及流域形势的影响,不同沟坡林木生境各异。不同林种覆盖区对谷坡过程的反作用差异明显。如何选择与人工林适宜的生境条件,并力求林分结构合理,属一值得重视的问题。

The Jiaomu Rivulet, situated at the interland of Wuling Mountains, is at 28°50′10″-28°54′5″N and 110°22′30″-110°27′25″E. The drainage area is 32km2. In the region, the landform of ravine vertial and horizontal forms the special forest habitat. The forest has the clear reaction to the landform process.1.The characteristics of the ravine structure:the main range and gullies go parallely, and almostly are vertical to the trend of the mountain ridges in the northeast. The colony of catchment basins are around the main ravine as an axial belt and the gully system is mainly made up of much-formed inleyings.2.The variation of the forest habitat in different ravines and slopes: the forest's nutrient comes from the materials of the ravine slopes and is key to the growth of planting the forest vegetation suitably. The influence is more obvious on the forest environment due to the difference of the formed structures of the ravine landform.3.The reaction of the forests on the process of the terrain of the ravines: It has the difference of the weathering speed, the runoff and denudation volumes on the slope surface of forest areas and non-forest areas. It has also the difference of damming water and soil of various kinds of trees.As a consequence, it should be to pay attention to the reasonable forest texture in the afforestation, and to form an potimun synthetical benefit.