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天然林     
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  natural forest
    Study on Policies of Natural Forest Conservation in the Upper Reaches of the Yangtze River
    长江上游地区天然林保护的政策研究
短句来源
    Study on the Evaluation and Analysis of China's Natural Forest Protection Program Policy
    中国天然林资源保护政策评价与分析研究
短句来源
    Regional Forest Biomass and Carbon Storage Estimation Study for Northeast Natural Forest Based on RS and GIS
    基于RS和GIS东北天然林区域森林生物量及碳贮量估测研究
短句来源
    Data from 4 100 m×100 m natural forest plots were used to estimate tree number per hectare and basal area based on plot sizes, the difference between estimated and actual values was calculated.
    采用4块100m×100m的天然林样地材料,根据不同样地大小对应林木的株数和断面积来估算其每公顷株数和断面积,计算估计值与实际值的差异;
短句来源
    Data from 4 100m×100m natural forest plots,then uniform angle index and pair-correlation function are used to analyze the spatial patterns of trees in forest plots with varying areas.
    采用4块100m×100m的天然林样地材料,分别利用角尺度和双相关函数分析4块大样地中不同面积的窗口(小样地)对应林木个体的空间分布格局。
短句来源
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  natural forests
    CO_2 Environment in Natural Forests of Changbai Mountain——a Preliminary Study.
    长白山天然林内CO_2环境初探
短句来源
    (2) The litters of coniferous trees accounted for 90% in artificial forests,but litters of broadleaf trees were 40% in natural forests.
    (2)人工林中针叶树的枯落物占90%以上,而天然林中阔叶树的枯落物占40%。
短句来源
    Discussing the Protection and Development of Natural Forests in North Fujian
    论闽北天然林保护与发展
短句来源
    Protection and Management of Natural Forests
    天然林的保护与管理
短句来源
    Establisment and Application of Straight Regression Models Between Rhizome and DBH of Main Tree Species in Natural Forests of North Yan′an
    林木根径与胸径回归模型的建立与应用——以延安北部天然林主要树种为例
短句来源
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  nature forest
    Studies on some problems of sustainable Forest Management and Nature Forest protection
    关于森林可持续经营与天然林保护若干问题的探讨
短句来源
    A Study on the Water Conservation Function of Tsuga longibracteata Nature Forest
    长苞铁杉天然林水源涵养功能研究
短句来源
    The results showed that the total value of ecosystem service of nature forest in Fujian Province was estimated to be 74.35×10~8USD/a, in which the ecological, economic and social values accounted for 75.00%,19.32% and 5.68%, respectively.
    研究结果表明:福建省天然林生态系统服务总价值为74.35×108美元/a,其中生态效益、经济效益和社会效益分别占75.00%、19.32%、5.68%,这反映出天然林生态系统具有明显的生态功能;
短句来源
    the diversity of community in the altitude of 1 850 m>in the altitude of 1 650 m>in the altitude of 2 050 m in the nature forest ,And the diversity was declining with the altitude increasing in planted forest;
    天然林土壤动物群落的多样性:海拔1 850 m处的>海拔1 650 m处的>海拔2 050 m处的,而人工林的群落多样性是随海拔的升高而降低;
短句来源
    It concludes that the growths in diameter,height and volume of Fraxinus mandshurica plantation at 24-yr-old are 1.81 fold,1.92 fold and 6.12 fold of the nature forest,respectively.
    24a生人工林直径、树高、材积生长分别为25a生天然林胸径、树高、材积的1.81倍、1.92倍和6.12倍。
短句来源
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  natural stand
    A Study of Genetic Gain of Pinus yunnanensis Natural Stand
    云南松天然林分遗传增益研究
短句来源
    STUDIES ON THE FRUITING RULE IN NATURAL STAND OF LARIX OLGENSIS HENRY IN ZHANBEI MOUNTAIN RANGE
    长白落叶松天然林结实规律的研究
短句来源
    THE GROWTH DISTRIBUTION AND REGENERATION CHARACTERISTIC OF PRINCE RUPPRECHT LARCH NATURAL STAND IN SHANXI
    我省华北落叶松天然林分布及生长更新特点
短句来源
    FACTORS AFFECTING BREAST HEIGHT DENSITY OF WOOD OF SAMPLE TREES FROM NATURAL STAND OF MASSON PINE
    影响马尾松天然林样木胸高木材密度因子的分析
短句来源
    Studies on the Soil Fertilities of Natural Stand of Chinese Fir in Wuyl Nature Reserve
    武夷山自然保护区杉木天然林土壤肥力的研究
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  natural forest
Natural forest conservation hierarchical program with neural network
      
Interspecific relationships in a natural forest dominated by Pinus kwangtungensis, a rare and endangered pine species endemic to China, were studied based on inventory data from 7,200 m2 plots in Nanling National Nature Reserve.
      
Comparing the two years before and after the implementation of Natural Forest Protection Program (NFPP) with the five years, the mean va1ue of FPF and FEF reduced by 0.341 (46.32%) and 0.327 hm2 per capita (54.94%), respectively.
      
The amount of microbial carbon in the long-plowed horizon was 40% of its content in the upper horizon of natural forest.
      
Under the fallow, the restoration of this ratio to the values typical of the soil under natural forest cenoses takes place.
      
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  natural forests
Although the RENIs of plantations in rehabilitated fields are a little lower than those of natural forests, they are higher than those of cultivated crops.
      
We studied 10-to 27-year-old artificial forests on rehabilitated lands in the upper reaches of the Yellow River with the objective of comparing the carbon densities of various artificial and natural forests.
      
The ratios of carbon density among vegetation, litter, and soil pools were 39.6:1.8:58.6 for artificial forests and 57.4:2.7:39.9 for natural forests.
      
We conclude that natural forests should not be protected in the FHA way after 45 years.
      
The results show that, in natural forests, structural diversity of pioneer communities is much lower than in late successive communities.
      
更多          
  nature forest
In the nature (forest) and in open air cultures Scabby sowbugs are not a pest.
      
Non-industrial private-forest owners: possibilities for increasing adoption of close-to-nature forest management
      
  natural stand
Application of organic fertilisers on natural stand bamboos for sustainable management in peninsular Malaysia
      
Study on tracheid variation ofPicea koraiensis (nakai) in natural stand and plantation
      
Tracheid characteristics ofPicea koraiensis from natural stand in Liangshui area and plantation in Mao'ershan area were studied.
      
In natural stand, it has positive correlation between the characteristics.
      
The tracheid length and diameter have no significant difference in growth between natural stand and plantations.
      
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