苦竹林立竹密度和施肥效应研究

通过四因素二次回归最优混合设计,研究了苦竹林立竹密度和施肥效应,结果表明:对笛竹定向培育林而言,施用氮肥、钾肥和立竹密度是影响新竹产量的主导因素,其中以立竹密度的影响效果最为明显;立竹密度为28741株/hm~2时,相对应的优化施肥量是:尿素513.38kg/hm~2、过磷酸钙658.31kg/hm~2、氯化钾233.66 kg/hm~2。立竹密度是影响笋笛两用林的新竹产量的主导因素;立竹密度为16821株/hm~2时,相对应的优化施肥量是:氮肥501.00kg/hm~2、磷肥819.52kg/hm~2、钾肥268.75kg/hm~2。

Studies on Bamboo Density and Fertilization Effects of Pleioblastus amarus Forests

The standing bamboo density and the effects of fertilization of Pleioblastus amarus forests were studied with the most optimum 4-factor and 2-degree orthogonal rotary mixed design.The results showed that for the oriented cultivation of flute bamboo forest,nitrogenous fertilizer,potash fertilizer,and standing bamboo density were main factors of affecting the yield of new bamboos and the effect of standing bamboo density was dominant.When the standing bamboo density was 28 741 culms per hectare,the corresponding optimal fertilizing amount was followed:carbamide 513.38kg/hm~2,superphosphate 658.31kg/hm~2,potassium chloride 233.66kg/hm~2.For the bamboo shoot and flute double usage forest,standing bamboo density was the leading factor of affecting the yield of new bamboos.When the standing bamboo density was 16 821 culms per hectare,the corresponding optimal fertilizing amount was followed:carbamide 501.00kg/hm~2;suporphosphate 819.52kg/hm~2,potassium chloride 268.75kg/ hm~2.