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土石山区的坡面治理多集中在自然条件较好的阴坡,阳坡治理速度很慢,成为水土流失的主要策源地。因此,迅速恢复和增加阳坡植被,是控制土石山区水土流失的根本措施之一。 土石山区阳坡的特点是:土层瘠薄,一般厚15～30厘米;植被覆盖度低且面积很小,一般只有0.4～0.5左右;土壤温度高和土壤含水率低。 实践证明,在长治地区阳坡造林是可行的,关键问题是要较好地解决缺水问题,而解决缺水的办法则是开源和节流。在阳坡绿化造林时,应注意采取以下几方面的技术措施。
Hillsides in mountainous areas are mostly concentrated in shady slopes with good natural conditions. The treatment of sunny slopes is very slow and has become the main source of soil and water loss. Therefore, the rapid restoration and increase of sunny slope vegetation is one of the fundamental measures to control soil erosion in mountainous areas. Rocky mountain slope is characterized by: barren soil, generally 15 to 30 cm thick; low vegetation coverage and small area, usually only about 0.4 to 0.5; soil temperature and soil moisture content is low. Practice has proved that afforestation in the Yangzi Changzhi area is feasible, the key issue is to better solve the problem of water shortage, and the solution to water shortage is to open source and cut expenditure. Afforestation in the sunny slope, should pay attention to the following aspects of technical measures.