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wei_zhicheng金蟲 (小有名氣)
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[求助]
幾句文獻翻譯的問題
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<Spatial pattern corrections and sample sizes for forest density estimates of historical tree surveys.> The U.S. General Land Office land surveys document trees present during European settlement. However, use of these surveys for calculating historical forest density and other derived metrics is limited by uncertainty about the performance of plotless density estimators under a range of conditions. 這就幾句話誰能幫我很通順的翻譯一下,謝謝! |

鐵桿木蟲 (正式寫手)

版主 (文壇精英)
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(分布格局校正和樣本量進行歷史上樹木調(diào)查的森林密度估計) 美國土地辦公室土地調(diào)查檔案記錄了歐洲移民時期的樹木量。然而,符合一定條件的范圍的非點密度估計具有不確定性,用這些調(diào)查來計算歷史上的森林密度以及其他的指標受到了局限。 spatial pattern 分布格局 1.Study on Abies fargesii population structure and spatial pattern; 巴山冷杉種群結構及空間分布格局的研究 2.Effects of Slash-and-Burning Practice on Spatial Pattern in Castanopsis carlesii Community I Main population method of analysis of spatial pattern; 煉山干擾對米櫧林分布格局的影響 Ⅰ.主要樹種分布格局的分析方法 3.However, the whole ecological benefit of green-land system is mainly determined by green-lands' internal structures and spatial patterns when the percentage of green-land coverage is less than 40%. 城市綠地在改善城市環(huán)境及維護城市生態(tài)系統(tǒng)平衡中起著極為重要的作用 ,而當綠地覆蓋率小于 4 0 %時 ,綠地整體生態(tài)效益的發(fā)揮主要取決于綠地的內(nèi)部結構和空間布局 ,但迄今為止缺乏綠地景觀分布格局與環(huán)境效應關系的研究報道。 |

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