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forest and man
相关语句
  相似匹配句对
     forest .
     林。
短句来源
     The Forest Sports
     森林里的运动会
短句来源
     Forest and Agriculture
     森林与农业
短句来源
     Forest and Health
     森林与健康
短句来源
     On forest ecosystem management.
     森林生态系统经营研究
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Through investigation and comparison of δ 13 C, Δ 14 C and 14 C apparent ages of organic carbon (SOC) of soil samples from soil profiles in typical natural forest and man made forest communities in Dinghushan natural reserve (23°09′22″~23°11′30″N, 112°30′39″~ 112°33′41″E) and Heshan Hill Land Interdisciplinary Experimental Station, Chinese Academy of Sciences (22°46′N, 112°57′E), carbon isotopes as indicators for restoration process of degenerated forest ecosystems has been...

Through investigation and comparison of δ 13 C, Δ 14 C and 14 C apparent ages of organic carbon (SOC) of soil samples from soil profiles in typical natural forest and man made forest communities in Dinghushan natural reserve (23°09′22″~23°11′30″N, 112°30′39″~ 112°33′41″E) and Heshan Hill Land Interdisciplinary Experimental Station, Chinese Academy of Sciences (22°46′N, 112°57′E), carbon isotopes as indicators for restoration process of degenerated forest ecosystems has been discussed.\;The vegetation types at the Qingyunsi and Cangxia profiles are monsoon broad leaved evergreen forest and monsoon broad leaved secondary evergreen forest, respectively, all belonging to the natural forest community. The vegetation types at the Kengkou and Mazhanlin profiles, however, are man made forest with planted Chinese rhoiptelea coniferous forest and the Mazhan Xiangsishu as the prodophytium, all belong to man made forest community rebuilt in grassland. The average δ 13 C values at the Qingyunsi and Cangxia profiles are -24.63‰ and -23.76‰, respectively, and the 14 C apparent ages of the bottom boundary SOC are 8?750 aB.P. and 10?315 aB.P. respectively. The average δ 13 C values at the Keng kou and Mazhanlin profiles are -21.22‰ and -22.73‰, respectively, and the 14 C apparent ages of the bottom boundary SOC are 2?880 a B.P. and 4?113 a B.P. respectively.\;Through comparison of the above mentioned 4 profiles for δ 13 C, Δ 14 C and 14 C apparent ages, it is clear that carbon isotope information of SOC can be expected to provide the following indication for planning in the restoration of a degenerated forest ecosystem:\;(1) Restoration or re establishment of an ecosystem at hill grassland with older 14 C ages are more beneficial to the succession of a man made forest community toward a zonal forest community;\;(2) In the process of the succession of a man made forest community toward a zonal forest vegetation, the δ 13 C distribution characteristics of the former is gradually dose to the latter.

本文以鼎湖山自然保护区和鹤山丘陵综合试验站为对象 ,开展不同地区、不同森林类型的土壤有机碳 (SOC)同位素示踪研究 ,探讨退化生态系统恢复过程中碳同位素的示踪作用。庆云寺和仓下剖面代表自然林 ,SOC的δ13C平均值分别为 - 2 4 63‰和 - 2 3 76‰ ;坑口和马占林剖面代表草坡上植树造林恢复的人工林 ,SOC的δ13C平均值分别为 - 2 1 2 2‰和- 2 2 73‰ ;剖面底界SOC的14 C表观年龄前者分别为 875 0aB .P .和 1 0 31 5aB .P .,后者分别为 2 880aB .P .和 41 1 3aB .P .。在SOC的14 C表观年龄老的丘陵草坡上进行退化生态系统重建 ,有利于人工森林群落向地带性森林群落演替

Nanjing Zijin mountain is a low hill,where is located at the north subtropical zone.So it has its climatic features,suitable for plants originate in the north and the south,has formed the very good vegetation which is natural forest and manmade woods, in which have better plant sunshade surroundings and dead branches and leaves.Largescale fungi have grown or bred more suitably in such climatic enviromment and nutritive conditions.The collected 350 species, of which have 246 specimens, have been identified...

Nanjing Zijin mountain is a low hill,where is located at the north subtropical zone.So it has its climatic features,suitable for plants originate in the north and the south,has formed the very good vegetation which is natural forest and manmade woods, in which have better plant sunshade surroundings and dead branches and leaves.Largescale fungi have grown or bred more suitably in such climatic enviromment and nutritive conditions.The collected 350 species, of which have 246 specimens, have been identified and classified to both Ascomycotina that has 4 genera and 5 species,and Basidiomycotina that has 107 genera and 241 species.103 species of them are recorded for the first time in Jiangsu.They have the value of nutritious medicine and health care, so have a bright future for exploiting and application.

南京紫金山为低山丘陵,具有北亚热带气候特征,适宜南北植物生长,构成繁茂的天然林和人工林交错分布的良好植被,有较好的植物遮荫环境和枯枝落叶层,气候环境和营养条件非常适宜大型直菌生长和繁殖。对采集到的350号真菌标本进行了分类鉴定,有246个种,其中241个种属担子菌亚门,5个种属子囊菌亚门,分布在4纲、4亚纲、14目、42科、107属中,有103个种为在江苏首次发现。这些真菌大多具有营养、医疗和保健价值,具有较高的开发应用前景。

The community characteristics and growth of natural forest and plantation of Liquidambar formosana Hance were studied by the investigation. The result indicates that there was significant difference between the community characteristics of natural forest and man-made forest of Liquidambar formosana Hance. The structure of man-made forest was more regular and simple than these of natural forest of L. formosana Hance. However,the understorey in the man-made forest is...

The community characteristics and growth of natural forest and plantation of Liquidambar formosana Hance were studied by the investigation. The result indicates that there was significant difference between the community characteristics of natural forest and man-made forest of Liquidambar formosana Hance. The structure of man-made forest was more regular and simple than these of natural forest of L. formosana Hance. However,the understorey in the man-made forest is less than that of natural forest of L. formosana Hance. There was also significant difference between the growth of natural forest and man-made forest of Liquidambar formosana Hance. The plantation is grow fast in the early stage and its the fast-growing-period was earlier than that of natural forest. Therefore,man-made forest is major measure for high yield of L. formosana Hance.

通过对枫香人工林和天然林的调查,进行枫香天然林及人工林群落特征及生长过程的比较研究,结果表明:枫香天然林和人工林的群落特征存在明显差异 枫香天然林林相不整齐,林冠层具有成层性,林下植被多;而枫香人工林林相整齐,乔木层树种单一,林分结构简单,林下植被少 枫香人工林与天然林在林分生长过程中有较大差异,枫香人工林生长迅速,进入生长速生期较早;而枫香天然林生长较缓慢,进入速生期迟,22年生时平均胸径仅为人工林的71% 因此营造枫香人工林是提高其林分生产力的有力途径

 
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