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华北落叶松苗木在生长高峰前喷施稀土能明显提高生长量。在6个处理:清水、200ppm、300ppm、400ppm、500ppm、600ppm中,随着处理浓度的增加,其苗高和地径的净生长量呈上升趋势,其中以600ppm效果为最好。 相似文献
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氮肥对一年生杨树地径和苗高的影响 总被引:1,自引:0,他引:1
《内蒙古林业调查设计》2017,(3)
文章通过对杨树扦插苗进行施氮肥,采用的是4个水平施肥量,不同时间调查苗高、地径生长量;进行数理统计分析后确定2水平为最佳施肥量。 相似文献
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采用积分回归方法,对小黑扬苗木灰斑病(Coryneum populinum Bres.)病情的时间分布与生长量之间关系进行了分析,通过研究表明:当年插条苗病情对生长量的影响在各时段内均为负效应,对苗高效应以7月下旬为最大,病情指数每升降1,苗高变化1.3cm,7月中旬和8月上旬持中,为1.0cm,8月中旬最小为0.02cm;对地径效应随时间变化而逐渐减小,7月上旬最大,为0.07mm,8月中旬最小,为0.02mm 相似文献
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Integrated Control Technique of Poplar Diseases in China 总被引:1,自引:0,他引:1
IntroductionNowthereservedarea-ofartificialforestsis3.3333xlO7hm2inChina,whiletheareaofPoplaris6.6xlo6hm2.ltmakesChinabecomethelargestcountryinpossess-ingartificialforestsofPoplar.PoplarvarietiesandnumberincreasegraduallyWithartificialforestsofpopIarrapid… 相似文献
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He Wang Huihui Zhang Yushu Liu Jinghong Long Liang Meng Nan Xu Jinbo Li Haixiu Zhong Yining Wu 《林业研究》2019,(4):1209-1219
The solution culture method was used to study the effect of increasing nitrogen on the growth and pho-tosynthesis of poplar seedlings under 100 mmol L-1 NaCl stress. I Increase in nitrogen reduced stomatal limitation of leaves under NaCl stress, improved utilization of CO2 by mesophyll cells, enhanced photosynthetic carbon assimi-lation capacity, significantly alleviated saline damage of NaCl, and promoted the accumulation of aboveground and root biomass. I Increased nitrogen enhanced photochemical efficiency (ΦPSⅡ) and electron transport rates, relieved the reduction of maximum photochemical efficiency (Fv/Fm) under NaCl, and reduced the degree of photoinhibition caused by NaCl stress. Increased nitrogen applications reduced the proportion of energy dissipating in the form of ineffective heat energy and hence a greater proportion of light energy absorbed by leaves was allocated to photo-chemical reactions. Under treatment with increased nitro-gen, the synergistic effect of heat dissipation and the xanthophyll cycle in the leaves effectively protected pho-tosynthetic PSⅡ and enhanced light energy utilization of leaves under NaCl stress. The increased nitrogen promoted photosynthetic electron supply and transport ability under NaCl stress evident in enhanced functioning of the oxygen-evolving complex on the electron donor side of PS Ⅱ. It increased the ability of the receptor pool to accept electrons on the PSII electron acceptor side and improved the sta-bility of thylakoid membranes under NaCl stress. Therefore, increasing nitrogen applications under NaCl stress can promote poplar growth by improving the effi-ciency of light energy utilization. 相似文献
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滩地杨树立地指数表的编制 总被引:8,自引:0,他引:8
在洞庭湖区垸内、外滩地Ⅰ-72、Ⅰ-69、Ⅰ-63杨混系造林的杨树林地不分品系收集样地99块、解析木材料50株,选用H=M(1Le^-KA)公式为树高曲线方程,基准年龄6年,指数级距2m,指数级7个(10-22m),采用树高相对值法导出各指数级各年龄树高值,编制出湖区垸内、外滩地3个南方型黑杨无性系及其混系造林林分均适用的立地指数表。 相似文献
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鹅掌楸实生苗生长规律研究 总被引:7,自引:0,他引:7
对河南大别山引种鹅掌楸1年生播种苗苗高、地径的年生长变化研究表明,苗高、地径的生长规律符合“S”型生长曲线,可用Logistic方程来拟合;采用有序样本聚类分析法划分苗木的生长时期,把生长期划分为4个阶段,即出苗期(5月14日以前)、生长初期(5月15日~7月14日)、生长盛期(7月15日~9月12日)和生长后期(9月13日~11月11日);其中,生长盛期的生长量占年生长量的68.28%。并拟合了苗高、地径生长的回归方程。 相似文献
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Richards生长函数在意大利杨树无性系人工林生长预测上的应用 总被引:1,自引:0,他引:1
以Richards生长函数为木模型,根据安徽省贵池市林场的29块意大利场树无性系临埋标准地和标准木调查材料,拟合出林分生长预测模型,对其生长量和生长率进行估测。并对胸径、树高、单株材积、蓄积量分别用拟合样本,检验样本以及拟合数据与检验数据并组成的样本数据进行了拟合效果检验。 相似文献
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植物生长调节剂处理对梨矮化砧木SPRB15快速成苗影响的研究 总被引:1,自引:0,他引:1
为了确立梨矮化砧木快速成苗技术,采用不同植物生长调节剂处理,研究了植物生长调节剂对梨矮化性砧木SPRB15快速成苗的影响。结果表明:间隔7天连续2次喷布GA4 7100 mg/L的处理4的地径生长量、苗高生长量均为最大,是本试验中的最佳处理。其次是2次喷布GA3100 mg/L的处理2,依次为2次喷布GA4 750 mg/L的处理3,2次喷布GA350 mg/L的处理1,2次喷布BA 250 mg/L的处理5。据此结果认为:GA4 7和GA3对于梨矮化性砧木SPRB15幼苗苗木的生长具有显著的促进效果;BA对于梨矮化砧木SPRB15苗木侧芽的萌发具有显著的促进效果。 相似文献
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Liu Yongchun Chen WenbinNortheast Forestry UniversityLi JichengDailing Experimental Forestry Bureau of Hcilongjiang ProvinceLi HuachenTahe Forestry Bureau of Heilongjiang Province 《林业研究》1991,2(1):37-41
The primary purpose of fertilization in nursery soils is to assure production ofhigh—quality planting stock. Therefore,the appropriate information on fertilizers and their use aswell as their effects on seedling growth is important to nursery managers in their nursery practice.Inthis paper,larch seedling growth response to six fertilizers are discussed based on the results ofthree—year studies which were carried out at Dailing Forest Nursery in 1987. 相似文献