施肥对三江平原丘陵区长白落叶松人工林中龄林单木树冠圆满度影响  

Effects of Fertilization on Crown Completeness of Individual Trees in Middle Aged Larix olgensis Plantation in Hilly Region of Sanjiang Plain

作　　者：王显军 卫月华 梁凤和 钟兆华 韩宛池 刘力铭 王子瑄 孙志虎 Wang Xianjun;Wei Yuehua;Liang Fenghe;Zhong Zhaohua;Han Wanchi;Liu Liming;Wang Zixuan;Sun Zhihu(Mengjiagang Timberyard of Huanan County, Jiamusi 154411, Heilongjiang, China;Mengjiagang Forestry Farm of Kiamusze, Jiamusi 154411, Heilongjiang, China;Ministry of Education Key laboratory of Sustainable Forest Ecosystem Management, Northeast Forestry University, Harbin 150040, Heilongjiang, China)

机构地区：[1]桦南县孟家岗贮木场,黑龙江佳木斯154411 [2]佳木斯市孟家岗林场,黑龙江佳木斯154411 [3]森林生态系统可持续经营教育部重点实验室(东北林业大学),黑龙江哈尔滨150001

出　　处：《林业科技情报》2021年第3期4-6,共3页Forestry Science and Technology Information

基　　金：国家自然科学基金项目(31770670)。

摘　　要：以三江平原丘陵区佳木斯市孟家岗林场间伐后长白落叶松(Larix olgensis Henry)人工林中龄林为对象,实施4种处理:施氮肥(施纯氮250kg/hm2)、施氮磷肥(施纯氮250kg/hm2+纯磷50kg/hm2)、施氮磷钾肥(施纯氮250kg/hm2+纯磷50kg/hm2+纯钾30kg/hm2)和对照(不施肥),研究施肥后不同时期冠幅和冠长变化,分析落叶松树冠圆满度对间伐后施肥的响应。结果表明:施肥3年后、4年后、5年后的长冠幅与短冠幅之比分别为1.3352~1.3684(平均为1.3465)、1.3279~1.3574(平均为1.3417)、1.1898~1.2270(平均为1.2104),低于对照林分相同时期的长冠幅与短冠幅之比(3年后:1.3786;5年后:1.2516);施肥4年后、5年后的冠幅与冠长之比分别为0.6417~0.7416(平均为0.7068)、0.3867~0.4153(平均为0.4044),低于对照林分的冠幅与冠长之比(5年后:0.4235)。间伐后施肥能够明显提高落叶松中龄林单木树冠圆满度。The middle aged Larix olgensis Henry plantation after thinning in Mengjiagang Forest Farm was selected to fertilization.After thinning in October 2012,the 4 treatments were established in July 2015:nirtogen fertilizer(N,250kg/hm),nitrogen+phosphorus fertilizer(NP,nitrogen 250 kg/hm+phosphorus 50 kg/hm),nitrogen+phosphorus+potassium fertilizer(NPK,nitrogen 250kg/hm+phosphorus 50kg/hm+potassium 30kg/hm)and control(no fertilizer).Fertilization after 3 years,4 years and 5 years,the crown width and crown length were studied.The results showed that:the ratios of long-crown width to short-crown width after 3,4 and 5 years of fertilization were 1.3352~1.3684(mean 1.3465),1.3279~1.3574(mean 1.3417)and 1.1898~1.2270(mean 1.2104),respectively,which were lower than the ratios of long-crown width to short-crown width in the control stand at the same period(3 years later:1.3786;5 years later:1.2516);The ratios of canopy width to canopy length after 4 and 5 years of fertilization were 0.6417~0.7416(mean 0.7068)and 0.3867~0.4153(mean 0.4044),respectively,which were lower than those of the control stand(5 years later:0.4235).Fertilization after thinning can obviously improve the crown completeness of single trees in middle aged larch forest.

关 键 词：施肥 长白落叶松人工林 中龄林 树冠圆满度 

分 类 号：S71[农业科学—林学]