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成林抚育旨在改善林分环境条件,调整密度,以促进林木干材增长,提高林分质量.过去,我们对抚育间伐强度和间伐木的标定,采取逐块实测和全面选择标定方法,结果虽能达到一定的精度要求.但是,在施工中出现,一是实测间伐强度用工量大,大面积开展有困难;二是间伐木的标定施工精度低,已经计算好的间伐量不能完整、准确地分配到林分中去,由于标定方法不统一,不是间伐材积超过了计算标准,就是小于计算量.这样,超标准间伐造成林分密度过低;小于计算间伐量会使密度高于设计要求.如果通过再次补代,易形成天窗,破坏林分生态,还会降低林地的利用率.为此,我们对抚育间伐方法进行了试验.现简述如下.
Forest tending aims to improve the stand environmental conditions, adjust the density in order to promote the growth of forest dry wood, improve the quality of the forest.In the past, we tending thinning and thinning timber calibration, block by block test and comprehensive selection of calibration methods, the results Although it can reach a certain accuracy requirements.However, appear in the construction, one is the measured thinning strength of the large amount of work, large area difficult to carry out; Second, the low precision of logging between the calibration construction, the amount of thinning has been calculated can not be complete and accurate Due to the inconsistency of the calibration methods, not the thinning volume exceeds the calculation standard or is less than the calculation amount, thus, the excessive standard thinning causes the low stand density; the smaller than the calculated thinning will make the density higher than the design requirement If through repeated replacement, easy to form a skylight, destroy the ecology of the forest, but also reduce the utilization of woodland.To this end, we have tending thinning method is now outlined below.