助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   forest defoliation 的翻译结果: 查询用时:0.191秒
图标索引 在分类学科中查询
所有学科
林业
更多类别查询

图标索引 历史查询
 

forest defoliation
相关语句
  森林落叶
     Decomposition of forest defoliation and role of soil animals in Xiao Hinggan Mountains
     小兴安岭森林落叶分解与土壤动物的作用
短句来源
  “forest defoliation”译为未确定词的双语例句
     Study on the decomposition of 12 kinds of forest defoliation and the role of soil animals in Pinus koraiensisbroad-leaved mixed forest and spruce-fir of Xiao Hinggan Mountains.
     在小兴安岭地区对 12种落叶分解过程和土壤动物作用进行了研究。
短句来源
  相似匹配句对
     forest .
     林。
短句来源
     UNDERWEAR FOREST
     内衣森林
短句来源
     Decomposition of forest defoliation and role of soil animals in Xiao Hinggan Mountains
     小兴安岭森林落叶分解与土壤动物的作用
短句来源
查询“forest defoliation”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  forest defoliation
Stream-water concentration data obtained over the period of 1980-1993 for White Oak Run, a stream in Shenandoah National Park, Va., indicate that change in catchment acid-base status is associated with forest defoliation by the moth larva.
      
Change in the acid-base status of an appalachian mountain catchment following forest defoliation by the gypsy moth
      
Forest defoliation by insects can lead to severe disruptions of the nitrogen (N) cycle resulting in elevated NO3- levels in stream water.
      
Change in the acid-base status of an Appalachian Mountain catchment following forest defoliation by the gypsy moth.
      


It is an important subject to monitor and assess forest resource quality.This not only relates to forest industry, but also affects regional environment and continuable development.This paper quantatively probes into the feasibility of mapping and assessing forest defoliation by remote sensing data, and indicates there is some correlative relation between the TM5/TM4 ratio and needle loss percentage. The nonlinear relation between the defoliation and TM5/TM4 ratio is established by using nonparametric...

It is an important subject to monitor and assess forest resource quality.This not only relates to forest industry, but also affects regional environment and continuable development.This paper quantatively probes into the feasibility of mapping and assessing forest defoliation by remote sensing data, and indicates there is some correlative relation between the TM5/TM4 ratio and needle loss percentage. The nonlinear relation between the defoliation and TM5/TM4 ratio is established by using nonparametric smoothing weight method and it is compared with linear relation. Powerful numericai results are provided to search for the best remote sensing parameter discriminating needle loss percentage. It is concluded that Logist curve is suitable for describing forest strecture change caused by defoliation.

森林资源现状的监测和评估,是环境资源遥感的重要内容之一,它不仅关系着林业的发展,而且直接对区域环境及其可持续发展有着深远的影响,因而,这一问题已引起各国的极大关注。本文主要探讨利用TM数据进行定量监测和评估森林落叶量的可行性,总结出森林植被绿色生物量的变化也可用罗辑斯蒂曲线来描述。

Study on the decomposition of 12 kinds of forest defoliation and the role of soil animals in Pinus koraiensisbroad-leaved mixed forest and spruce-fir of Xiao Hinggan Mountains.The method of eliminating the role of soil animals of different groups from different mesh decomposition bags was adopted.The results show that the decomposition efficiency of the defoliation is large mesh > small mesh >check, that is to say the role of large-type and middle-small-type soil animals and microorganism >...

Study on the decomposition of 12 kinds of forest defoliation and the role of soil animals in Pinus koraiensisbroad-leaved mixed forest and spruce-fir of Xiao Hinggan Mountains.The method of eliminating the role of soil animals of different groups from different mesh decomposition bags was adopted.The results show that the decomposition efficiency of the defoliation is large mesh > small mesh >check, that is to say the role of large-type and middle-small-type soil animals and microorganism > the role of middle-small-type soil animals and microorganism > the role of microorganism only.The average decomposition efficiency of three years is 28.9%(large mesh), 28.2%(small mesh) and 26.2%(check mesh).By the end of the third year, the degree of decomposition of three kinds of mesh bags is 86.7%(large mesh), 84.6%(small mesh) and 78.7% (check mesh). The decomposition of latifoliate defoliation is entirely higher than conifer defoliation in three kinds of mesh bags.In latifoliate defoliation, the decomposition degree of Phellodondron amuriensis,Fraxinus mandshurica,Ulmus laciniata,Juglans mandshurica andAcer mono is the highest.But in conifer defoliation, the decomposition degree of Pinus koraiensis is the highest.From the decomposition of 12 kinds of defoliations in 3 years, the decomposition of defoliation is effected not only by large-size soil animals but also by middle-small-size soil animals, but the degree of function is different.In the prophase of decomposition, the role of soil animals was gradually increasing and the biggest value appeared in October of the second year.Subsequently, the sole of soil animals was decreasing, and the role of large-type soil animals > the role of middle-small-type soil animals.The role of soil animals is different when the kind of defoliation and the time of decomposition are different.

在小兴安岭地区对 12种落叶分解过程和土壤动物作用进行了研究。采用不同网孔分解样袋 ,排出不同类别土壤动物作用的方法。结果表明 ,落叶分解消耗率 :大孔 >小孔 >对照 ,即大型、中小型土壤动物和微生物的共同作用 >中小型土壤动物和微生物的共同作用 >只微生物的作用。三年平均分解消耗率分别是 2 8.9% (大孔 )、 2 8.2 % (小孔 )和 2 6.2 % (对照 ) ,到第三年末 ,三种样袋 12种落叶平均分解程度分别达到 86.7% (大孔 )、 84 .6% (小孔 )和 78.7% (对照 )。分解初期土壤动物的作用逐渐增大 ,到第二年 10月土壤动物的作用达到了最大值 ,随后土壤动物的作用逐渐降低 ,大型土壤动物的作用小于中小型土壤动物的作用。落叶种类不同 ,分解时间不同 ,土壤动物作用也不同。

The effects of limestone and magnesite additions on masson pine(Pinus massoniana) forest growing on acidified soil were studied at Tieshanping,Chongqing in Southwest China.The site receives very high sulfur deposition(about 16g·m~(-2)a~(-1) measured in canopy throughfall) and severe forest defoliation and mortality are observed.The pH value of soil is in the range of 3.6~4.2,much lower than what considered optimal for masson pine(4.5~6.0).A field manipulation experiment was set up in 2003 in a planted...

The effects of limestone and magnesite additions on masson pine(Pinus massoniana) forest growing on acidified soil were studied at Tieshanping,Chongqing in Southwest China.The site receives very high sulfur deposition(about 16g·m~(-2)a~(-1) measured in canopy throughfall) and severe forest defoliation and mortality are observed.The pH value of soil is in the range of 3.6~4.2,much lower than what considered optimal for masson pine(4.5~6.0).A field manipulation experiment was set up in 2003 in a planted 40 year old masson pine stand.6 adjacent sample plots of 10×10 m~2 were divided into two blocks of three plots each.Within each block,one plot was randomly assigned to one out of three treatments.The three treatments consisted of two different liming treatments(one-time addition of 30 kg limestone and 25 kg magnesite respectively on the soil surface in December 2003) and a reference treatment.The magnesite powder was much coarser than the limestone.To find the effect of such treatments,ecological investigation was first carried out in November 2003 and redone in November 2004,including the measurement of tree height and diameter at breast height(DBH),evaluation of crown color and crown density,collection of needles and fine roots,and analysis of ground vegetation.The comparison of the results before and after the treatments indicates that some ecological responses may be visible already after one year.The average increments of DBH in limestone and magnesite treated plots were 0.43 and 0.38 cm respectively,much higher than 0.27 cm in reference plots(with the significance of p<0.005).The average needle density and biomass did not change significantly after liming(p>0.05),but the average needle length in the magnesite-treated plots was remarkably higher than that in reference plots(p<0.005).The biomass of fine roots in the upper 30cm of the soil increased in all plots(including reference plots),with larger increment in the treated ones.This indicates that liming may increase the root biomass production.The average increments of fine root biomass were 0.16,0.32,and 0.67 kg/m~3 in the upper 10 cm soil layer from the reference,limestone-treated,and magnesite-treated plots respectively,0.20,0.17,and 0.35 kg/m~3 in the middle 10 cm layer,and-0.07,0.15,and 0.21 kg/m~3 in the lower 10 cm.Hence,the change of root biomass was more notable in upper layer of soil than lower.Although most studies in Europe indicated that there was no increase in tree growth in general as a result of liming,it seems that application of limestone and/or magnesite in this study could increase the growth of masson pine.The treatment also had effects on the biodiversity of ground vegetation,for instance decreased the abundance of oxyphilic species such as Miscanthus sinensis and Dicranopteris pedata quickly.The five 1×1 m~2 quadrates in each limestone-treated plot lost on average three clusters of Miscanthus sinensis and five clusters of Dicranopteris pedata,and the magnesite-treated plots lost on average 10 and 18,respectively.Many seedlings were found in the treated plots,so were several dead saplings of oxyphilic plants such as Camellia sinensis.In contrast,very few seedlings and several dead saplings of Cunninghamia lanceolata and Quercus fabri were found in the reference plots.In conclusion,the two treatments show different effects on the ecosystem.In addition to the DBH and average needle length of masson pine,the Ca and Mg content of needle in magnesite-treated plots was remarkably higher than that in limestone-treated plots.It seems that the addition of magnesite is more effective for increasing forest growth than limestone.It should also be noted that the Ca and Mg content of needle in limestone-treated plots was even lower than that in reference plots,which indicates that the addition of Ca only with large amount may cause deficiency of other nutrient elements such as Mg.Long term follow up of controlled liming experiments should be conducted before conclusions regarding large scale applications are drawn.

为了确定酸化森林生态系统的修复效果,在重庆铁山坪的马尾松林内设立了6个10m×10m的样地,其中2个作为对照样地,另外4个分别在土壤表面施撒石灰石和菱镁矿粉末,各有2个重复。在处理前和处理1a后的生长季末各进行了一次植被观测,协方差分析和多重比较的结果显示投加修复剂对马尾松生长的影响已经初步显现,马尾松的胸径增量和针叶平均长度都有显著的增加,而针叶中Ca、Mg元素含量也表现出显著的差别。另外,立木更新的变化、细根生物量的增加和物种多度的变化也较明显,总体来说生态系统有恢复的趋势。土壤上层细根的增加较快,这与在土壤表面施撒修复剂,上层土壤的化学变化较显著是一致的。而两种修复剂对生态系统的影响也表现出明显的差异,相对而言,施撒菱镁矿的效果可能会更好。由于土壤修复的效果是长期的,其影响观测还将继续下去。

 
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关forest defoliation的内容
在知识搜索中查有关forest defoliation的内容
在数字搜索中查有关forest defoliation的内容
在概念知识元中查有关forest defoliation的内容
在学术趋势中查有关forest defoliation的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社