关键词: 水稻产量, 水稻产量

Abstract:

In order to explore the effects of different density on Larix principis-rupprechtii, the author used the method of standard average growth comparison to study different thinning intensity on the diameter at breast height, tree height and volume year growth of 24 years Larix principis-rupprechtii by tending management to improve the growth of Larix principis-rupprechtii. The results showed that the different thinning intensity on the larch diameter and volume of annual growth had a significant effect, with thinning intensity increases, DBH, volume growth quantity increases gradually, when the thinning intensity was 450/hm2 when the left and right sides, diameter at breast height and volume of annual growth reached the maximum value; and thinning intensity on the tree height effect.