Root number characteristic of three typical soil and water conservation plants in an open-pit coal mine dump of Inner Mongolia
GE Rile, LIU Yanqi, A Ruhan, NA Risu, SI Qin, ZHANG Yongliang
1. College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, 010019, Hohhot, China;
2. College of Grassland Resources and Environment, Inner Mongolia Agricultural University, 010019, Hohhot, China
Abstract：[Background] Root system is a critical organ for plants to absorb water and nutrients. The more the number of roots and the longer the root is, the deeper and wider the distribution is, and the stronger the ability of soil consolidation of plant roots is. That is, the quantitative and structural characteristics of the root system have an important impact on the soil consolidation of plant roots. There are many open-pit coal mines in Inner Mongolia, which have caused the growing difficulties of plant roots and a large amount of surface runoff.[Methods] In Heidaigou opencast dump site of Zhunger coalfield at Erdos City of Inner Mongolia, choosing the sample plots where 3-4 years old Hedysarum laeve, Astragalus adsurgens, and Melilotus suaveolens grew well, we randomly selected 50 of each plant as the sample, and measured their ground diameters (maximum diameter, plant height and crown width). Further we chose 5 plants closest to the average value from the 50 plants as standard plants. Then we determined the root diameter class by digging whole plant, measuring root diameter with electronic Vernier caliper, and measuring root length with tape. The method of determining the represented root is to classify the root system at an interval of 0.5 mm, calculate the cumulative root number, the cumulative root length and the cumulative root surface area of each diameter class. The relatively large diameter groups were taken as their represented roots.[Results] 1) In the total number of roots, the order of their branching abilities was M. suaveolens (79) > A. dadanensis (67) > H. leave (52), this was related to the plant's own biological characteristics. According to the number of different lateral roots, there were lateral roots Ⅲ for 3 plants. Among them, the number of lateral roots Ⅲ was > the number of lateral roots Ⅱ > the number of lateral roots Ⅰ for H. leave and A. adsurgens. The percentages of number of lateral roots Ⅱ and Ⅲ were 87% and 80% respectively, obviously larger than the percentage of lateral roots Ⅰ at 13% and 20%. For M. suaveolens, the number of lateral roots Ⅲ was higher than that of lateral rootsⅠ > number of lateral roots Ⅱ, and the percentage of the number of lateral roots Ⅱ and Ⅲ was 71%, significantly larger than that of lateral roots Ⅰ, 28%. The results indicated that the root system of three species was mainly fine root in soil. 2) Their represented root diameter classes were H. laeve 0 mm-2.5 mm,A. adsurgens and M. suaveolens 0 mm-1.5 mm, respectively. The roots of 3 plants in soil were mainly distributed with ≤ 2.5 mm.[Conclusions] The represented root diameter should be taken as the main research scope while studying biomechanical properties of root system fixing soil and resisting erosion.
格日乐1, 刘艳琦1, 阿如旱1, 娜日苏2, 斯琴1, 张永亮1. 3种典型水土保持植物根系数量特征[J]. 中国水土保持科学, 2018, 16(1): 88-95.
GE Rile, LIU Yanqi, A Ruhan, NA Risu, SI Qin, ZHANG Yongliang. Root number characteristic of three typical soil and water conservation plants in an open-pit coal mine dump of Inner Mongolia. SSWC, 2018, 16(1): 88-95.
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2018, Vol. 16 
