山杨次生林,Populus tremuloides
1)Populus tremuloides山杨次生林
1.Analysis on Spatial Distribution Layout of Secondary Forest ofPopulus tremuloides in Jingouling;金沟岭林场山杨次生林空间分布格局分析
英文短句/例句
1.Study on Intraspecific and Interspecific Competition of the Populus davidiana Secondary Forest in Mao"ershan Mountains Area帽儿山地区山杨次生林林木竞争关系的研究
2.The Seed Bank in Logging Gaps in Populus davidiana-Betula platyphylla Secondary Forests in Changbai Mountain长白山杨桦次生林采伐林隙种子库特征
3.Growth Process and Succession Trend of Polar-Birch Secondary Forests in Changbai Mountain,Northeast China长白山杨桦次生林生长过程与演替动向分析
4.Study on Interspecific Competition Among Dominant Tree Species in Alniphyllum fortunei Secondary Forest in the Meihuashan Nature Reserve梅花山拟赤杨次生林优势树种种间竞争研究
5.A Study on Effects of Biological Mulching on Growth and Soil Properties of Poplar Plantation in Southern Upland Area;南方山地杨树人工林生物覆盖效应的研究
6.Gap Dynamics in a Secondary Coniferous Forest of Guandi Mountain关帝山天然次生针叶林林隙动态研究
7.Eco-physiological Effect of Populus Davidiana-Quercus Liaotungensis Mixed Forests in Ziwuling Forest Area;子午岭林区山杨—辽东栎混交林生理生态效应研究
8.Optimal Growing Space for Juglans mandshurica in Second Growth Forests in Changbai Mountains长白山林区天然次生林胡桃楸的适宜生长空间
9.Effects of Biological Mulching on Rhizospheric Nutrition and Growth of Poplar Plantation in Southern Upland Area;生物覆盖对南方山地杨树人工林根际营养及生长的影响
10.Study on Regeneration Pattern in Secondary Forest in Maoershan Region;帽儿山地区天然次生林更新格局研究
11.Spatial and Temporal Pattern of the Avian Nest Webs Structure in Secondary Forest;山地次生林鸟类巢网结构的时空格局
12.Study on the Nodule Nitrogen Fixation Ability of Alnus nepalensis Secondary Forest in Ailao Mountain哀牢山桤木次生林根瘤固氮能力研究
13.Tree Individual Pattern Control and Analysis of Secondary Forest in Moarshan Mountain;帽儿山天然次生林林木空间结构控制方法
14.The Relationship between Clutch Size and Breeding Success of Great Tit in Secondary-forest;山地次生林中大山雀窝卵数与繁殖成功的关系
15.Habitat and Ecology: On moist places in secondary forests of mountain ridge.生境与生态：生于山顶次生林中潮湿的处。
16.Native Auxiliary Species of Mixed Broadleaf-Korean Pine Stands--Populus ussuriensis Kom.阔叶红松林的伴生乡土杨树——大青杨
17.Habitat and Ecology: On open hillsides, margin of forests and sometimes in secondary forests.生境与生态：多生长于林下、缘及山坡草地，有时亦见于次生林中。
parison of Community Characteristics of Plantation and Secondary Forest of Pinus armandii in Huoditang Forest Region of Qinling Mountain秦岭火地塘林区华山松人工林与天然次生林群落特征比较
相关短句/例句
Secondary Populus davidiana and Betula platyphylla forest白桦山杨次生林
3)Secondary poplar and birch mixed forest次生杨桦林
4)Populus davidiana-Betula platyphylla secondary forests杨桦次生林
1.The soil seed bank in logging gaps of different sizes and ages was studied inPopulus davidiana-Betula platyphylla secondary forests in Changbai Mountain.研究长白山杨桦次生林不同大小采伐林隙的土壤种子库特征。
5)secondary forest山地次生林
1.The role of magpie in formed bird community organism insecondary forest;喜鹊在山地次生林中鸟类群落组织结构形成的作用
6)Populus davidiana山杨林
1.ASPEN (Populus davidiana) FOREST IN WULINGMOUNTAIN NATURAL RESERVE;雾灵山自然保护区的山杨林
2.This paper studied the soil physical-properties underPopulus davidiana, Quercus liaotungensis, andPopulus davidiana-Quercus liaotungensis mixed forest in the Ziwuling forest asea of Loess Plateau, and the leaf photosysthetic characteristics of these three types of forests.研究了黄土高原子午岭次生林区山杨林、辽东栎林和山杨-辽东栎混交林3种林分的土壤物理特性和叶片光合特性。
延伸阅读
次生林次生林secondaryforest原始森林经过多次不合理采伐和严重破坏后自然形成的森林。与原始林一起同属天然林，但其立地特点、树种组成、林分结构和起源与原始林、人工林不同。人工林采伐迹地上，栽培树种的萌生林与入侵树种形成的混交林，也属于次生林。次生林分布范围广，种类多，不仅可以生产木材、薪炭材和林副产品，而且在涵养水源、保持水土、调节气候和维持生态平衡等方面均起着重要的作用。中国次生林约占全国森林面积的46.2％。次生林可划分为多种类型。①按发生时间分成早期次生林、中期次生林和晚期次生林。一般用以区别大范围内次生林的性质及恢复速度，供经营规划时参考。②按发生地区分成远山次生林和近山次生林。一般反映人为活动的强弱及经营次生林与农业的关系。③按经营措施分成抚育型、改造型、利用型和封护型等。④还可按森林自然特征分类，方法较多，有按优势树种和树种组成划分的，有以生态因子划分的，有以地形作为主导因子进行划分的，还有以立地条件和优势树种划分的。次生林的经营措施应根据自然特征和经济条件（交通、劳力、产品销路等）选用：①抚育间伐。科学地确定采伐木和采伐强度，为目的树种生长创造有利的环境条件。②林分改造。是在密度小、经济价值低或病虫害严重的林分中全面或局部伐除原林分，再栽植珍贵树种，以调整林分组成，增加林分密度，提高林分生产力。③抚育改造。是抚育间伐与林分改造相结合的一种经营方式。④封山育林。利用树木自然繁殖能力恢复森林的措施。可分为全封、半封和轮封3种。封山期间禁止一切人为活动，开封片则允许在一定季节内进行林副业生产活动。主要用在交通不便和经营水平不高的地区。郁郁葱葱的次生林
