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We explored pollution input-output of soil Cd and As for one growth cycle of vegetables in peri-urban vegetable soil along Xijiang river, preliminarily verified the input-output of IW, discussed source apportionment of Cd and As in PFs, RW and IW, systematically calculated Cd and As contents in local PFs, IW and RW. The conclusions were as follows, IW had the largest effect on Cd input to the vegetable soil, mean content was 0.1050 mg·(m2)-1 in the growth cycle, followed by PFs and RW. PFs had the largest effect on As input to vegetable soil, mean content was 2.300 mg·(m2)-1, followed by RW and IW. According to the input-output of IW and preliminary incomplete statistical analyses, Cd in IW fully showed input status and As fully showed output status to the vegetable soil, suggested to increase the risk monitoring of Cd in IW and As in PFs. [ABSTRACT FROM AUTHOR]

To improve the natural environment of arid and desert areas and to protect sand vegetation, we take estimation of the aboveground biomass of Haloxylon ammodendron in the Liangucheng National Reserve as our research object in this study, using SPSS and Excel software for data analysis and processing. Models for estimating aboveground biomass in sandy and gravel soil were established, and the results showed that this value for H. ammodendron was significantly correlated with basal diameter and plant height, as well as their complex variables. The best estimation models in sandy and gravel soil are W = 0.138 (DH)1.397 and W = 0.189 (DH)1.433, which have prediction accuracies of 82.825% and 83.688% and average relative errors of 14.392% and 13.455%, respectively. These models have high fitting precisions and can be used to estimate the biomass of H. ammodendron. [ABSTRACT FROM AUTHOR]