幼質地土壤 的英文怎麼說

中文拼音 [yòuzhíderǎng]
幼質地土壤 英文
fine texture soil
  • : Ⅰ名詞1 (性質; 本質) nature; character; essence 2 (質量) quality 3 (物質) matter; substance;...
  • : 名詞1. (土壤) soil 2. (地) earth 3. (地區) area 4. (姓氏) a surname
  • 質地 : 1. (某種材料的結構性質) quality; texture; consistency; weight (衣服的); grain 2. (人的品質) character; disposition
  1. Studies on physical ch aracters of soil in mixed forest of chinese fir and paulownia

    杉木泡桐混交的物理性
  2. 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

    結果表明: ( 1 )從落葉松齡林到中齡林,隨著林冠的郁閉和林下植被蓋度的急劇下降,林酸度、酶活性、無機磷總量、速效鉀、水分含量、總孔隙度呈明顯下降趨勢,而根際和非根際有機含量、腐殖各組分含量、三大類微生物數量、酸性磷酸酶活性和容重隨著凋落物的增加呈明顯上升趨勢;從中齡林到近熟林,由於撫育間伐,林分密度及郁閉度下降,林下植被蓋度逐步得到恢復,根際與非根際有機含量、富里酸、交換性酸、交換性鋁、中性磷酸酶、無機磷總量、放線菌數量、水分含量、總孔隙度呈明顯的上升趨勢;從近熟林到成熟林,隨著林齡的增大,根際與非根際活性酸、有機含量、腐殖各組分含量、有效磷含量、氨基酸總量、速效鉀、酶的活性、水分含量和總孔隙度呈下降趨勢,而根際與非根際全磷含量、酸度(特別是交換性鋁)和容重呈增加趨勢。
  3. 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

    本文通過固定和典型樣,對東北山不同生長發育階段落葉松人工林和二代落葉松齡林以及與二代落葉松齡林同一塊林的樟子松齡林、天然次生林、落葉松水曲柳混交林等8個林型量進行了對比與分析,深入探討了落葉松人工林量降低的機理和不同發育階段量變化規律以及與森林生產力變化的關系,並提出了林量調控措施。
  4. Fine texture soil

    幼質地土壤
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