accumulation of organic matter meaning in English

有机质堆积

The retention and accumulation of organic matters , n and p in sediment of wetlands the contents of organic matters and tn ( total nitrogen ) are higher in the layers below 40cm in reed ( phragmites communis ) and wild rice ( zizania latifolia ) wetland sediments , compared with that in the same layers of field soil
有机质、 n 、 p在沟渠湿地底泥中的累积效应芦苇( phragmitescommunis )和茭草( zizanialatifolia )湿地底泥对有机质、 tn 、 tp有持留和累积作用。 40cm以下深度的底泥中沉积了远较农田高的有机质和tn ， tp在芦苇和茭草湿地底泥中的含量均高于处于相同层次的土壤中的含量。