半干旱区两种草原类型植物体内草酸钙研究

Study on Calcium Oxalate in Plants of Two Types of Steppe Zones in Semi-arid Area

本文利用连续组分法测定了半干旱区两种草原类型植物体内的草酸钙含量,在宁夏盐池北部的宁夏哈巴湖国家级自然保护区(植被为荒漠化草原)采集了91种植物,在内蒙古正蓝旗中北部(植被为典型草原)采集了77种植物。结果表明,在宁夏哈巴湖,草酸钙含量最高的物种是猪毛菜(Salsola collina)、沙蓬(Agriophyllum squarro-sum)、尖头叶藜(Chenopodium acuminatum)、草原石头花(Gypsophila davurica)和虫实(Corispermum declina-tum),内蒙古正蓝旗植物草酸钙含量最高的物种是灰绿藜(Chenopodium glaucum)、猪毛菜(Salsola collina)、碱地肤(Kochia scoparia var.sieversiana);两地禾本科草本草酸钙含量均显著低于非禾本科草本,宁夏哈巴湖自然保护区和内蒙古正蓝旗禾本科草本的草酸钙含量比非禾本科草本分别低56.37%和45.29%;C_3植物体内的草酸钙含量显著低于C_4植物。可见,植物体内草酸钙是植物长期适应进化的结果。

In this study,we collected 91 species of plants from the Ningxia Habahu National Nature Reserve in the north of Yanchi county of Ningxia Hui Autonomous Region(the desertified steppe in semi-arid area)and 77 species plants from the middle north of Zhenglan banner of Inner Mongolia Autonomous Region(the typical steppe in semi-arid region);and determined the plant calcium oxalate of both regions using the sequential fractionation procedures.The results showed that the species with the highest calcium oxalate contents were Salsola collina,Agriophyllum squarrosum,Chenopodium acuminatum,Gypsophila davurica,and Corispermum deslinatum in the Ningxia Habahu National Nature Reserve and Chenopodium glaucum,Salsola collina and Kochia scoparia var.sieversiana in Zhenglan Qi County.Statistics showed that the calcium oxalate contents of grass plants were significantly lower than those of herb plants in both regions,the calcium oxalate content in grass plants was 56.37%and 45.29%lower than those in herb plants in the Ningxia Habahu National Nature Reserve and Zhenglan Qi County,respectively.Moreover,the plants with higher calcium oxalate content had worse palatability by beasts.Statistics showed that the calcium oxalate contents of C3 plants were significantly lower than those of C4 plants of both sites.Thus,differences of calcium oxalate content in plants are long-term results of their adaptation to the environment.