1) age-class stand
龄级林
2) stand age
林龄
1.
Biome and stand ages impacts on soil CO_2 efflux and partitioning:a global trends;
生物群区和林龄对森林土壤呼吸及其组分的影响
2.
Soil heterotrophic respiration in Casuarina equisetifolia plantation at different stand ages
不同林龄的木麻黄林下土壤异养呼吸特征(英文)
3.
Soil properties and water conservation function of Betula platyphylla secondary forest with different stand ages
不同林龄白桦次生林土壤特性及其水源涵养功能
3) forest age
林龄
1.
A case study on estimating natural forest age with DBH distribution and forest growth model;
天然林林龄的模拟估算及案例
2.
Decomposition characteristics such as decomposition dynamics, decomposition rate and leaf substrate quality affected by forest age were manipulated by mesh bags in 21-,29-and 36-year-old Pinus tabulaeformis stands in the middle hilly lands of Yingpan,Yanqing Country of Bejing in 2005.
结果表明:在所观测的14个月内,不同林龄油松叶凋落物分解动态差异较小,均呈快—慢—快的规律,翌年5至7月份凋落物分解速率低于2005年同期的分解速率。
3.
From the angle of time space, the paper mainly analyses that the timevariation of forest factors such as the type of forest, forest age, canopy density, which are closest relation to forest fire, gives rise to the variation of forest fire risk.
本文从林分的时空角度入手 ,着重分析了不同林分、林龄、郁闭度随时间的推移导致森林火灾危险性的变化 ,其一般规律是 :中郁闭度林分 ,年龄增加、郁闭度增加 ,林木枝下高增加快 ,从而地表火发生率降低 ,树冠火危险性增大 ;长期未郁闭的疏林 ,地表火危险长期存在 ,林分生产力低 ;灌木、草坡是地表火发生率最高 ,生产力最低的类型。
4) age class
龄级
1.
Dry matter storage and water soluble sugar content in different age classes rhizomes of Phragmites communis population in dry land habitat of Songnen Plain of China;
松嫩平原旱地生境芦苇种群不同龄级根茎的干物质贮藏及水溶糖含量
2.
Mean of expected stocking volume of various timber sorts tended to increase with the age classes,however they fluctuated between age classes,particularly for the Robinia pseudoacacia L.
结果表明 ,没有利用价值的林木占总林木株数的 5 0 %以上 ;龄级间各期望成材类型的蓄积均值趋于随着龄级的增长而增加 ,但波动较大 ,特别是在好的立地条件下生长的刺槐乔林 ;油松和刺槐矮林在好的立地条件下 ,期望成材的蓄积量高于其在差的立地条件下的值 ,对刺槐乔林来说则截然相反 ;在相同龄级内刺槐乔林的期望成材蓄积量高于刺槐矮林和油松林 ;由于林分间变异系数太大 ,因而龄级和好坏立地条件之间各期望成材类型的蓄积量差异并不显著 ,仅有个别龄级在好和差的立地条件下可见微小的差异 ;这是由无规则的抚育间伐利用造成的 ,立地越好 ,采伐强度越
3.
Based on the two factor hierarchic model, the effect of age class and site goodness on the major stand parameters of the black locust and Chinese pine plantations on the Weibei Loess Plateau were analyzed.
基于双因子等级模型对龄级和立地好坏两个因子对渭北黄土高原刺槐和油松人工林的主要林分参数的作用效应进行了方差分析。
5) age-class
龄级
1.
Spatial patterns of different age-class individuals in Pinus tabulaeformis forest in Songshan Nature Reserve of Beijing,China;
北京松山自然保护区天然油松林不同龄级立木的空间点格局
2.
Spatial pattern analysis of individuals in different age-classes of Larix principis-rupprechtii in Luya mountain reserve, Shanxi, China;
芦芽山华北落叶松林不同龄级立木的点格局分析
3.
There are comparatively rich seeds in the soil seed bank in different age-classes of a planted Pinus massoniana Lanb.
龙里不同龄级马尾松人工林土壤种子库土层中有较为丰富的种子,种子数量为1201~4045粒/m2,最多的是4龄级4045粒/m2。
6) old-growth forest
老龄林
1.
Dynamics of aboveground biomass of sub-alpine old-growth forest in the upper Minjiang River(UMR);
岷江上游亚高山林区老龄林地上生物量动态变化
2.
At presently,the plantation area in China come to be more than 53 million hectares,being the first in the world,but there are few data on the carbon cycle of plantation ecosystem in the China,especially the plantation of the old-growth forest, limiting the precise estimation on the carbon.
但目前有关人工林生态系统碳循环方面的研究较少,特别是人工林中的老龄林生态系统碳循环研究,在一定程度上限制了对我国人工林生态系统碳汇/源的准确评估。
补充资料:科特林/萨姆.科特林级驱逐舰
国别:前苏联
类型:驱逐舰
编号:
舰艇名称: 科特林/萨姆.科特林级驱逐舰
前苏海军导弹驱逐舰,1954年至1958年,科特林级共建造18艘,萨姆.科特林共建造8艘,本级舰也向国外出口。
战术技术性能数据:
排水量(标准/全载/吨):3950
舰尺度(长/宽/吃水/米):127.5/12.9/4.6
航速(节):34
续航力(海里/节):5500/16
舰员编制(官/兵):285(360)
动力装置(类别/功率/匹):锅炉4台/72000
武器系统:4(2)-130毫米高平两用炮;16(4)-45毫米高炮;(8-30毫米机炮;)1-sa-n-1双联装防空导弹发射器;4(2)-火箭深弹发射器;5-533鱼雷发射管;
电子和雷达系统(萨姆级):顿河k导航雷达;警犬电子对抗系统;首网对空对海雷达;鹰声/歪鼓/遮阳/蛋杯炮瞄和火控雷达;果皮群制导雷达;高杆敌我识别雷达
声纳系统:武仙座
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