幼龄林 meaning in English
[林学] young growth
Examples
- Correlativity between growth and nutrient contents in foliage of young chinese fir plantation
杉木幼龄林叶片营养元素含量与林木生长的相关性 - Evergreen broad - leavedforest is classified into three types as follows : nurture type of early sapling forest , intemediate cutting type of medium sapling forest , density management type of mid - maturation forest
将阔叶林划分为3个经营类型,分别为:初期幼龄林组成抚育类型、中期幼龄林抚育间伐类型、中龄林密度管理类型。 - ( 3 ) compared to young stand of the first rotation of larix olgensis , activity acidity ( ph value ) , organic matter content , humus component content , moisture , and total porosity in rhizosphere soil of the young stand of the second rotation of larix olgensis decreased
( 3 )二代落叶松幼龄林与一代落叶松幼龄林相比，根际土壤活性酸( ph值) 、有机质含量、腐殖质组成、土壤水分含量和总孔隙度降低。 - 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。 - The study has investigated and compared soil physical , chemical , biochemical properties of eight stands on paired sites in mountainous regions of northeastern china , trying to look for the mechanism of soil degradation and the change trend of soil properties in different age of plantations in relations to forest productivity . the eight stands are 4 first rotation of larix olgensis plantations with different age classes , the second rotation of larix olgensis young stand , pinus sylvestris var
本文通过固定和典型样地，对东北山地不同生长发育阶段落叶松人工林和二代落叶松幼龄林以及与二代落叶松幼龄林同一块林地的樟子松幼龄林、天然次生林、落叶松水曲柳混交林等8个林型土壤质量进行了对比与分析，深入探讨了落叶松人工林土壤质量降低的机理和不同发育阶段土壤质量变化规律以及与森林生产力变化的关系，并提出了林地土壤质量调控措施。