乌兰布和固定半固定沙地种植物下沙土粒径分析

ANALYSIS ON THE DIAMETER OF SANDY SOIL UNDER THE PSAMMOPHYTE OF FIXED AND SEMI-FIXED SAND LAND IN ULAN BUH DESERT

本文通过对乌兰布和固定半固定梭梭(Haloxylon ammodendron)林沙土进行采样测定其各粒级的百分含量,并与乌兰布和沙漠中白刺(Nitrariaspp)、油蒿(Herba artemisiae ordosicae)、柽柳(Ramulus myricariae platyphyllae)沙样及流沙各粒级的百分含量进行对比分析,结果表明:乌兰布和固定半固定梭梭林下沙样干沙层细沙含量为61.65%,极细沙含量为23.84%,中沙含量为4.48%,其沙物质主要由细沙组成。梭梭林下沙样湿沙层中细沙含量为73.05%,极细沙含量为25.44%,中沙含量为0.15%,其沙物质主要由细沙组成;也可以得知在乌兰布和沙漠中固定半固定沙地这一特定的立地条件下,白刺改良土壤的效果最好,其次分别为油蒿、柽柳、梭梭。

In this paper,the sandy soil under the H.ammodendron（Haloxylon ammodendron） Lin of fixed and semi-fixed sand land in Ulan Buh Desert was sampled to determine percentage of each size fraction,and the contrastive analysis was made with the sand sample of Nitraria（Nitrariaspp）,oil Artemisia（Herba artemisiae ordosicae）,Tamarix（Ramulus myricariae platyphyllae） and shifting sand.The result shows that,under the H.ammodendron（Haloxylon ammodendron） Lin of fixed and semi-fixed sand land in Ulan Buh Desert,the percentage of fine sand of dry sand layer was 61.65%,the percentage of very fine sand was 23.84%,the percentage of middle sand was 4.48%,and the sand materials is composed by fine sand.The percentage of fine sand of wet sand layer was 73.05%,the percentage of very fine sand was 25.44%,the percentage of middle sand was 0.15%,and the sand materials is composed by fine sand.The result also show that under the special site condition of fixed and semi-fixed sand land in Ulan Buh Desert,the effect of soil improvement made by Nitraria is the best of all,The second was Artemisia、Tamarix and H.ammodendron respectively.