例句與造句

1. 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(jié)果表明： ( 1 )從落葉松幼齡林到中齡林，隨著林冠的郁閉和林下植被蓋度的急劇下降，林地土壤酸度、土壤酶活性、無(wú)機(jī)磷總量、速效鉀、土壤水分含量、總孔隙度呈明顯下降趨勢(shì)，而根際和非根際土壤有機(jī)質(zhì)含量、腐殖質(zhì)各組分含量、三大類微生物數(shù)量、酸性磷酸酶活性和土壤容重隨著凋落物的增加呈明顯上升趨勢(shì)；從中齡林到近熟林，由于撫育間伐，林分密度及郁閉度下降，林下植被蓋度逐步得到恢復(fù)，根際與非根際土壤有機(jī)質(zhì)含量、富里酸、交換性酸、交換性鋁、中性磷酸酶、無(wú)機(jī)磷總量、放線菌數(shù)量、土壤水分含量、總孔隙度呈明顯的上升趨勢(shì)；從近熟林到成熟林，隨著林齡的增大，根際與非根際土壤活性酸、有機(jī)質(zhì)含量、腐殖質(zhì)各組分含量、有效磷含量、氨基酸總量、速效鉀、土壤酶的活性、土壤水分含量和總孔隙度呈下降趨勢(shì)，而根際與非根際土壤全磷含量、土壤酸度(特別是交換性鋁)和容重呈增加趨勢(shì)。
2. It's difficult to find preliminary thinning in a sentence. 用preliminary thinning造句挺難的