羧甲基纤维素钠对红海榄幼苗生长和土壤养分的影响OACSTPCD

In order to clarify improvement effects of sodium carboxymethyl cellulose(CMC)on sandy gravel soils in coastal difficult sites,taking Rhizophora stylosa hypocotyls as materials,effects of different CMC appli-cation amounts(mass ratios were 1.6%,2.4%,3.2%,4.0%and 4.8%)on growths of R.stylosa seedlings and soil nutrients were analyzed through indoor tidal-simulation test.Results showed that growths and biomass of R.sty-losa seedlings showed increasing and then decreasing trends with increase of CMC application amounts,which were maximal at 4.0%CMC treatment.Compared with CK,plant heights,ground diameters and number of leaves increased to 9.78%-38.54%,13.83%-54.31%and 20.00%-36.67%respectively,and biomass of roots,stems and leaves increased to 10.58%-64.72%,7.97%-36.76%and 37.62%-117.99%respectively,and con-tents of soil organic matter,total potassium and available potassium significantly increased to 625.22%-671.96%、147.62%-161.52%and 55.56%-77.78%respectively.CMC could promote growths of R.stylosa seedlings and improve soil nutrients,which could be used as soil amendments for sandy gravel soils in coastal difficult sites and recommended application amount was 4.0%.