华北落叶松速生丰产林培育技术(十六) |
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来源: 作者: 发布时间:2013-07-27 11:16 |
3、根据胸径与冠幅关系求适宜营养面积、确定保留株数 一面坡林场利用最小二乘法配置冠径和胸径的回归方程: 999中国苗木网,999miaomu.com 999中国苗木网,www.999miaomu.com y = 0.9533+0.118x+0.0013x2
中国苗木网,www.999miaomu.com 中国苗木网,999miaomu.com 式中: y—冠径;
中国苗木网,999miaomu.com 苗木网,999miaomu.com x—胸径。 999苗木网,999miaomu.com
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这是二次抛物线关系,确定阴向缓坡落叶松人工林按营养面积保留的株数(表5-7)。
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中国苗木网,999miaomu.com 该场某小班十四年生落叶松人工林,每公顷有林木株数为3755株,单株立木最适营养面积为3.14㎡,每公顷适宜株数为3185株,则应间伐570株,其间伐强度(按株数计算)为15%。 中国苗木网,999miaomu.com 中国苗木网,999miaomu.com 表5-7 落叶松人工林胸径、冠径营养面积表 999中国苗木网,www.999miaomu.com
中国苗木网,www.999miaomu.com 胸径 苗木网,www.999miaomu.com 苗木网,999miaomu.com 冠 径
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中国苗木网,www.999miaomu.com 理论值 999中国苗木网,999miaomu.com 999苗木网,999miaomu.com 冠 径 999苗木网,www.999miaomu.com 999苗木网,www.999miaomu.com 实际值 999中国苗木网,www.999miaomu.com
中国苗木网,999miaomu.com 离差 苗木网,999miaomu.com
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营养面积(平方米)
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每公顷株数, 中国苗木网,www.999miaomu.com 999苗木网,www.999miaomu.com 按营养面积求。
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999苗木网,www.999miaomu.com 7
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苗木网,www.999miaomu.com +0.1 中国苗木网,999miaomu.com
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2.66 苗木网,999miaomu.com
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3759 999苗木网,999miaomu.com 999中国苗木网,999miaomu.com 8
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999苗木网,www.999miaomu.com 1.97
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999苗木网,999miaomu.com -0.5 999苗木网,www.999miaomu.com 999苗木网,999miaomu.com 3.05
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2.12
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0.02
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4.01
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999苗木网,999miaomu.com 中国苗木网,www.999miaomu.com 4.56 苗木网,999miaomu.com
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999苗木网,999miaomu.com -0.03 999中国苗木网,www.999miaomu.com 999苗木网,www.999miaomu.com 5.13 苗木网,999miaomu.com 999中国苗木网,www.999miaomu.com 1949
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2.69
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999苗木网,999miaomu.com 0.02 苗木网,999miaomu.com
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㈣ 根据胸高断面积定量间伐 999中国苗木网,999miaomu.com 999苗木网,www.999miaomu.com 测定林分的树高一般比较困难且误差较大,用角规办法测定林分断面积,可以不设标准地也不作每木检尺,便能够很容易测得。按经营目的,分别林分的发育阶段,确定出最适的林分胸高断面积,再根据最适的胸 苗木网,999miaomu.com 999苗木网,www.999miaomu.com 35
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图5-2中下限的断面积水平线,可参考所经营树种的生长过程表,或利用该经营树种自然稀疏进程规律,把株数换算成断面积,也可以用年龄、胸径、胸高断面积等因子的回归关系,或根据实际调查材料,用图解法求得。 999苗木网,www.999miaomu.com
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