共查询到18条相似文献，搜索用时 934 毫秒
1.
赤—36杨树高生长量与气候因子灰色关联度分析 总被引：2，自引：0，他引：2
选用喀左县境内杨树速生丰产林的主要造林树种赤－３６杨树标准木作解析，用其树高生长量作为参考数列，以杨树生长期的气候指标作为比较数列，进行灰色关联度分析，其结果气候因子以杨树高生长量的影响，光照因子起主导作用，水分子次之，热量因子为第３位。 相似文献
2.
3.
4.
5.
杨树是辽西北半干旱地区主要的速生用材林树种,近年来,随着退耕还林工程的实施及辽蒙阻沙林工程的实施,以速生丰产为主要培育目标的杨树栽培技术彰显其重要性。为此,在对影响半干旱地区杨树速生丰产的主要制约因子进行分析的基础上,提出杨树速生丰产的主要技术措施,期待对辽西北半干旱地区的杨树速生丰产栽培有所借鉴。 相似文献
6.
在半干旱地区，杨树造林通过不间断地引种更新，提高了本地区杨树品种优良化水平，对增加林木生长量和提高生态防护功能效果显著。在杨树引种的工作中，结合本地区的气候特点和自然条件，坚持适地适树和循序渐进的原则，就能实现预期的引种效果。 相似文献
7.
对山西省雁北地区的杨树扦插苗扦插立地条件及扦插时间进行了试验,结果发现：好的立地条件对扦插成活率及生长量影响很大,在土壤条件比较差的河滩地,扦插时间延后于正常经验时间可大大提高成活率,获得良好的经济效益。 相似文献
8.
9.
本文应用灰色系统理论中的关联度分析方法,定量地分析了加拿大杨插条苗和刺槐播种苗苗期高生长量与气候因素的关系。结果表明:气候因子对两种苗木高生长量的影响效应基本一致,其主导因子均为水分状况,从而为苗期的科学管理提供了量化的理论依据。 相似文献
10.
11.
Based on the data of stand investigation and stem analysis, the effects of climate factors on the poplar protection forest
increment in the riverbank field of the Dalinghe and Xiaolinghe rivers of Liaoning Province, China were studied by stepwise
regression procedure and grey system theories and methods. A regression model reflecting the correlation between the height
increment of poplar protection forest and climatic factor was developed. The order of grey relevance for the effect of climatic
factors on the height increment of poplar protection forest is: light>water>heat, and it could be interpreted that the poplar
increment was mainly influenced by light factor, water factor, and heat factor. This result will provide scientific basis
for the intensive cultivation and regenration of the poplar protection forest in riverbank field in similar regions in China.
Foundation item: This study was supported by the National Natural Science Foundation of China (No. 30270250), and a key direction project
(No. C12MC-SCMS013)
Biography: LI Hai-mei (1975-), female, Ph. D, department of Landscpe Architecture. Art. Laiyang Agricultural College, Shandong Qingdao
266109, P. R. China.
Responsible editor: Song Funan 相似文献
12.
研究湿地防护林水文生态效益与气候环境因子的响应是湿地生态保护与经营管理中的热点问题。本文通过自然降雨径流小区定位观测试验,定量研究了黄河三角洲湿地刺槐林地及其采伐迹地的产流产沙效果和土壤水分动态变化规律。刺槐林地与采伐迹地相比,一场降雨的径流量减少53.9%～150.8%,泥沙量减少172.8%～387.1%;刺槐林地降雨径流洪峰峰值比采伐迹地低0.8L·s-1,且径流洪峰值出现的时间比采伐迹地滞后25min;刺槐林地和采伐迹地土壤含水率随年内降水量变化分干湿两季,呈周期性变化,刺槐林地年平均含水率比采伐迹地高23.3%～25.6%,特别是雨季其含水率比采伐迹地高24.3%～29.8%。应用逐步回归分析理论和方法,建立了刺槐生态防护林高生长量与气候环境因子的回归模型,影响该地区刺槐林高生长的主导因子是光照因子,其次是水分因子,再次是热量因子。该项研究可为黄河三角湿地刺槐防护林的更新改造及其生态水文效益的定量评价提供科学依据。 相似文献
13.
The relationship between eco-hydrographic benefit of forest vegetation and climatic environmental factors is one of the focuses
in the research on environmental protection and ecosystem countermeasures in Wetland. The runoff, sediment and soil moisture
rate dynamics in Robinia pseudoacacia plantation and its clearcut area were investigated in the natural runoff experiment plots in Yellow River Delta Wetland,
Shandong Province, China. The correlation of height increment of R. pseudoacacia with nine climate factors such as light, water, heat, etc. was analyzed by stepwise regression analysis. The results showed
that the amounts of runoff and sediment in clearcut area of R. pseudoacacia were 53.9%–150.8% and 172.8%–387.1% higher than that in Robinia pseudoacacia plantation, respectively. The runoff peak value in R. pseudoacacia stand was obviously lower than that in clerarcut area, meantime, the occurrence of runoff peak in R. pseudoacacia stand was 25 min later than in its clerarcut area. The soil moisture rates in R. pseudoacacia stand and its clearcut varied periodically with annual rainfall precipitation in both dry season and humid season. The annual
mean soil moisture rate in R. pseudoacacia stand was 23.3%–25.6% higher than that in its clearcut area. Meanwhile, a regression model reflecting the correlation between
the height increment of R. pseudoacacia and climatic factors was developed by stepwise regression procedure method. It showed that the light was the most important
factor for the height increment of R. pseudoacacia, followed by water and heat factors.
Foundation project: Subsidized by the National “11th Five Year” Plan of Science and technology (2006BAD26B06, 2006BAD03A1205)
and Ecological Restore Project of Water Resources Ministry of China (2006-2008). 相似文献
14.
15.
本文根据灰色系统理论,选用与中山柏的生态适应性和生长潜力有关的气候因素资料,采用关联序分析法,以关联度来作为气候生态适应性的一种度量,并结合数理统计原理,根据气候生态适应性关联度值的线性回归模型对中山柏的生长量进行灰色预测.结果表明,预测精度较高,而且计算简便,实用性好,为林木生长量的预测提供了一种新方法. 相似文献
16.
Today, most poplar plantations in the temperate region are established on abandoned marginal agricultural land, but there is great potential for planting poplars on forest land as the available area is large and does not compete with food production. The objective of this study was to examine how different planting types (un-rooted cuttings, bare-rooted and containerized plants) affect the establishment and early growth of poplar plants on forest and agricultural sites. Our results suggest that on the agricultural site, survival and growth during the first two years are not influenced by plant type. However, at the forest sites, survival of rooted plants was superior compared to un-rooted cuttings. The height and biomass (stem and root) increment of bare-rooted plants was low; greater height and biomass growth was found for containerized plants. Container sizes had no effect on height growth, but leaf and stem biomasses were higher if the largest containers were used. When using the largest containers, concentrations of macronutrients (N, P) were increased compared to bare-rooted plants. Thus, these results suggest that practices for establishing poplar plantations of agricultural land include planting of un-rooted cutting, but on forest land, a plant grown in a container of 470?ml should be used. Together, this can reduce the cost of establishment, increase the available area for poplar plantations and have an impact on poplar plantation economics in Sweden. 相似文献
17.
利用相关性分析和主成分分析的方法,分析了冰核细菌溃疡病发生特点与环境条件的之间的关系,选出了影响杨树病害发生的主要影响因子。同时综合分析病害流行的主因和诱因,提出东北地区杨树冰核细菌溃疡病危险等级划分标准,并将东北地区分为重发区、常发区、偶发区和安全区4个不同等级冰核细菌溃疡病发生区。6种模型曲线的非线性回归分析表明,冰核细菌溃疡病流行的时间动态以理查德生长模型为最优生长模型。运用逐步回归分析方法,建立了多元线性的中期预报方程,可以预测第二年的病情指数。根据病情指数随时间增长的趋势,选用灰色方法建立GM(1,1)数学模型,可做出中长期预报。 相似文献
18.
笔者针对山西北部大面积的杨树成过熟林分亟需更新改造的现状,按照"良种+良法"模式,在河流阶地、平川沙荒和黄土丘陵3种立地类型下,以抗逆速生的白杨优良无性系金白杨为换代品种,采用杨树伐桩嫁接更新改造技术,成活率达到94.8%以上。嫁接后金白杨快速形成自生根系,生长量超过群众杨,7年生金白杨树高达到11.5 m,胸径达到11.3 cm,郁闭度达到0.3,林相整齐。 相似文献