孔隙度降低 meaning in Chinese

reduction of porosity

( 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。