Contrastive study on soil water content characters of Artemisia arenaria and Calligonum mongolicunl shrubs in artificial sand-fixation area in Gurbantunggut Desert of Northwest China
The natural Artemisia arenaria and Calligonum mongolicunl shrubs were selected in five-year sand fixation area beside the desert canal in Gurbantunggut Desert , Northwest China . According to shrub crown size , five horizontal distance levels and four vertical depth levels were chosen to contrastively study the soil water content (SWC ) of the two shrubs . The result showed that the SWC values increased with the soil layer depth , the AWC values of two lower lay- ers (20~40 cm , 40~60 cm) were significantly (P<0 .05) more than the two upper layers (0~10 cm, 10~20 cm) , while the other AWC were not markedly different . There were no clear differences at every distance at the soil layers of the two upper levels of A . Arenaria shrub and total four of C. Mongolicunl shrub . While the RWC of mid-shrub (50 cm ) at the two lower layers of A . Arenaria were the most, and it was significantly ( P<0 .05 ) different from the shrub edge (80 cm). The soil bulk density values at the upper layers of the two shrubs were slightly higher than those at the two lower layers , but there were no evident differences between the two shrubs , different distances and different layers . It was found that A . Arenaria shrub with dense branches had a certain "fertile island effect" of water , compared to C . Mongolicunl shrub which had sparse branches . This effect was beneficial to the growth and diffusion of A . Arenaria population , maybe it was one of the important factors to cause the distribution difference of the two shrubs and to widely dis- tribute in the artificial sand-fixation area for A . Arenaria population .
artificial sand-fixation areaArtemisia arenariaCalligonum mongolicunlsoil water contentbulk densityfertile island effectGurbantunggut Desert
国家科技期刊平台
NSTL
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