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林分密度的英文

发音:  
"林分密度"怎么读用"林分密度"造句

英文翻译手机手机版

  • density of stand
  • stand density

例句与用法

  • Impacts of stand density of first - rotation chinese fir on growth of 2 - year - old , second - rotation chinese fir plantations
    第1茬林分密度对2茬2年生杉木林生长影响
  • This paper summarized the studies on biomass production , biomass growth models , biomass measurement , biomass and forest density , as well as carbon storage of poplars in china in recent 20 years
    摘要本文总结了中国近20年来有关杨树生物量产量、生物量增长模型、生物量测定、生物量与林分密度,以及杨树碳储量方面的研究进展。
  • Mongolica young stand , secondary natural forest , and the mixed forest of larix olgensis and fraxinus mandshurica rupr . . countermeasures for controlling soil degradation were also recommended . the study got following results : ( 1 ) from young stand to mid - age of larix olgensis , with the closure of canopy and the decrease of undergrowth vegetation cover , soil acidity , enzyme activity , total inorganic phosphorus , available k , soil moisture and total porosity decreased significantly ; while soil organic matter content , humus component content , the amount of three main types of microbes , acid phosphatase activity , and bulk density in rhizosphere soil and non - rhizosphere soil increased with the increase of the amount of forest floor litter ; from mid - age stand to near mature stand , with the decrease of stand density and crown cover as well as the restoration of undergrowth vegetation after preliminary thinning , soil organic matter content , fulvic acid , exchangeable acidity , exchangeable aluminium , neutral phosphatase activity , total amount of inorganic phosphorus , the amount of actinomycetes , soil moisture , and total porosity in rhizosphere soil and non - rhizosphere soil apparently increased ; from near matu re stand to mature stand , soil activity acidity , organic matter content , humus component content , available phosphorus , total amount of amino acid , available k , soil enzyme activity , soil moisture , and total porosity in rhizosphere soil and non - rhizosphere soil decreased , but total phosphorus , soil acidity ( in particular , exchangeable aluminium ) , and bulk density increased
    结果表明: ( 1 )从落叶松幼龄林到中龄林,随着林冠的郁闭和林下植被盖度的急剧下降,林地土壤酸度、土壤酶活性、无机磷总量、速效钾、土壤水分含量、总孔隙度呈明显下降趋势,而根际和非根际土壤有机质含量、腐殖质各组分含量、三大类微生物数量、酸性磷酸酶活性和土壤容重随着凋落物的增加呈明显上升趋势;从中龄林到近熟林,由于抚育间伐,林分密度及郁闭度下降,林下植被盖度逐步得到恢复,根际与非根际土壤有机质含量、富里酸、交换性酸、交换性铝、中性磷酸酶、无机磷总量、放线菌数量、土壤水分含量、总孔隙度呈明显的上升趋势;从近熟林到成熟林,随着林龄的增大,根际与非根际土壤活性酸、有机质含量、腐殖质各组分含量、有效磷含量、氨基酸总量、速效钾、土壤酶的活性、土壤水分含量和总孔隙度呈下降趋势,而根际与非根际土壤全磷含量、土壤酸度(特别是交换性铝)和容重呈增加趋势。
用"林分密度"造句  

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