干旱区地理2011，Vol.34Issue(2)：222-228,7.
干旱区植物根际土壤养分状况的对比研究
Nutrition in the rhizosphere of five xerophytic plants
摘要
Abstract
Rhizosphere is commonly regarded as the volume of a thin layer of soil immediately surrounding the plant roots. Due to the microbe populations' interactions and the root activities in this region, the rhizosphere soil usually distinguishes significantly from the “bulk” soil, which is not influenced directly by living roots. To determine the magnitude of rhizosphere effect on different plants in arid region, a rhizobag experiment on five xerophytic plants of Haloxylon ammodendron,Haloxylon persicum, Salsola ruathenica, Peganum harmala and Alhagi sparsifolia was cartied out to investigate the difference of soil pH and nutrient content in rhizospbere and bulk soil at the south edge of Gurbantunggut Desert. The results show that pH values in rhizosphere of five xerophytic plants were lower than those in bulk soil, and it differentiated significantly between the rhizospbere and bulk soil for H. ammodendron. organic matter content in rhisospbere was higher than those in bulk soit of five xerophytic plants, especially for the three grass plants of S. ruathenica, P. harmala and A. sparsifolia, and the accumulation ratios for them were 110.27％, 113.08％ and 126.73％ respectively. Total N content in the rhizosphere of S. ruathenica and P. harmala was smaller than in bulk soil, and the deficient milos were 24.54％ and 18.75％ respectively, while total N was richly accumulated in the rhizosphere of A. sparsifolia, and its accumulated ratio reached 120. 43％ compared to bulk soil. Available N content in rhisosphere and bulk soil presented a opposite pattern with total N, accumulated in rhizosphere of S. ruathenica and P. harmala, and depleted in A. sparsifolia' s rhizosphere. For total P and total K, there were no significant differences between the rhizosphere and bulk soil. Available P was also depleted in rhizosphere of S. ruathenica and P. hannala. While available K depleted in the rhizosphere of H. ammodendron,and accumulated in the rhizosphere of A. sparsifolia. All results documented five xerophytic plants presented different extent of rhizosphere effects actually, and exerted positive action in reducing rhizosphere pH and increasing organic matter in rhizoshere, which exerts great action on the restoration of soil resources in arid region. Besides, due to different life form, the rhizosphere effects of H. ammodendron and H. persicum in this experiment was smaller than that of other grass plants.关键词
根际效应/pH值/土壤养分/干旱区Key words
Rhizosphere effect/ pH/ soil nutrition/ arid region分类
农业科技引用本文复制引用
李从娟,李彦,马健,范连连,王吉利..干旱区植物根际土壤养分状况的对比研究[J].干旱区地理,2011,34(2):222-228,7.基金项目
中国科学院"西部之光"人才培养计划"干旱区不同耐盐机制沙生植物根际土壤特征的对比研究" （）
