| 收获时间和覆土对杜仲短周期矮化林生物量的影响 |
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| 引用本文： | 丁欢欢,刘慧东,张宁,王璐,杜庆鑫,杜红岩,刘攀峰,孙志强.收获时间和覆土对杜仲短周期矮化林生物量的影响[J].经济林研究,2020,38(2):131-137. |
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| 作者姓名： | 丁欢欢 刘慧东 张宁 王璐 杜庆鑫 杜红岩 刘攀峰 孙志强 |
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| 作者单位： | 国家林业和草原局泡桐研究开发中心,河南郑州 450003;南京林业大学,江苏南京 210037;河南颐城控股有限公司,河南郑州 450003;河南省科学技术信息研究院,河南 郑州 450003;国家林业和草原局泡桐研究开发中心,河南郑州 450003;经济林种质创新与利用国家林业局重点实验室,河南郑州 450003;国家林业局杜仲工程技术研究中心,河南郑州 450003 |
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| 摘 要： | 【目的】了解杜仲短周期矮林模式适宜的收获时间和种植密度。【方法】在66 667株/hm^2栽植密度下,按完全随机区组试验设计,设定4个收获时间,分别为2017年8月30日、9月15日、9月30日和10月15日,每个时间点收获时分成2组,一组平茬后将根桩覆土,另一组不覆土,于次年观察发芽时间,测定生长指标和生物量,比较66 667、33 333、22 222、16 667和13 333株/hm^2种植密度下杜仲矮林地上部分生物量。【结果】收获时间影响次年杜仲的发芽时间,总体上收割越早,发芽越晚。对收割后根桩进行覆土,次年不同收获时间叶片、树皮和茎各自处理间的生物量差异均显著。其中,2017年9月30日和10月15日收割的矮林,次年叶片、树皮和茎的生物量较其他处理高;平茬后根桩未覆土组中,次年不同收获时间叶片、树皮和茎各自处理间的生物量差异均不显著,而且各器官未覆土组生物量大多高于覆土组。另外,33 333和66 667株/hm^2栽植密度下的叶片、树皮和茎生物量显著高于其他3个栽植密度的生物量,其中33 333株/hm^2栽植密度下叶片、树皮和茎的生物量均值分别为4 656.71、1 967.28和15 121.02 kg/hm^2。【结论】应尽量待杜仲短周期矮林苗木进入休眠期进行收割,及时进行平茬后根桩的覆土作业,栽植密度最好采用33 333株/hm^2,每个根桩留置2~3个主枝,有利于次年生物量的积累。
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| 关 键 词： | 杜仲 短周期矮林 收获时间 覆土 生物量 |
Effects of harvest time and mulching soil on biomass in short-rotation Eucommia ulmoides coppice |
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| DING Huanhuan,LIU Huidong,ZHANG Ning,WANG Lu,DU Qingxin,DU Hongyan,LIU Panfeng,SUN Zhiqiang.Effects of harvest time and mulching soil on biomass in short-rotation Eucommia ulmoides coppice[J].Economic Forest Researches,2020,38(2):131-137. |
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| Authors: | DING Huanhuan LIU Huidong ZHANG Ning WANG Lu DU Qingxin DU Hongyan LIU Panfeng SUN Zhiqiang |
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| Institution: | (Paulownia R&D Center of China,Zhengzhou 450003,Henan,China;Nanjing Forestry University,Nanjing 210037,Jiangsu,China;Henan E-City Holdings Co.,Ltd.,Zhengzhou 450003,Henan,China;Henan Provincial Institute of Science and Technology Information,Zhengzhou 450003,Henan,China;Key Laboratory of Non-timber Forest Germplasm Enhancement&Utilization of State Forestry Administration,Zhengzhou 450003,Henan,China;Eucommia Engineering Research Center of State Forestry Administration,Zhengzhou 450003,Henan,China) |
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| Abstract: | 【Objective】To learn optimal harvest time and planting density in Eucommia ulmoides short-rotation coppice.【Method】Under planting density of 66667 plants per hm2,four harvesting dates were set according to completely randomized block test design,concluding August 30,September 15,September 30 and October 15 of 2017.There were two treatment groups of mulching soil and non-mulching soil after stumping on a harvest date.Sprouting time,growth indexes and biomass were observed and measured in next year.Aboveground biomass was compared under five planting densities of 66667,33333,22222,16667 and 13333 plants per hm2.【Result】Harvesting time can affect sprouting time.Overall,the earlier harvesting,the later sprouting.Biomass of leaves,barks and stems harvested in next year are significantly different in mulching soil treatments after harvest on different dates.Among them,in harvested coppice on September 30 and October 15 of 2017,biomass of leaves,barks and stems in next year are significantly higher than those in other treatments.In next year,biomass of leaves,barks and stems have no significantly difference in non-mulching soil treatments after harvest on different dates,and biomass of each organ in non-mulching soil treatments is higher than that in mulching soil treatments.In addition,biomass of leaves,barks and stems under planting densities of 33333 and 66667 plants per hm2 are significantly higher than those under other three planting densities.Average biomass of leaves,barks and stems under planting density of 33333 plants per hm2 are 4656.71,1967.28 and 15121.02 kg/hm2,respectively.【Conclusion】E.ulmoides short-rotation coppice should be harvested when trees enter a dormant period.Stumps should be mulched with soil in time.Optimal planting density is 33333 plants per hm2,and each stump need to be remained two or three axial shoots,which is beneficial for accumulation of biomass in next year. |
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| Keywords: | Eucommia ulmoides short-rotation coppice harvesting time biomass |
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