Effects of wheat root on the characteristic of soil micro-aggregates at different slope positions of purple hill slope
LIU Jing1, WANG Yong1, HOU Ning1, ZHANG Hanyu1, ZHA Lin2, LU Xiuyuan1, LI Fucheng3
1. College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, 625000, Ya'an, Sichuan, China; 2. Collage of Forestry, Sichuan Agricultural University, 610000, Chengdu, China; 3. College of Resource & Environment, Southwest University of Science and Technology, 621000, Mianyang, Sichuan, China
Abstract：[Background] The interaction between tillage erosion and water erosion causes soil and water losses in hilly croplands, which is a severe problem in hilly area with purple soil. In order to provide a scientific basis for the effects of wheat roots on water and soil conservation, the impacts of wheat roots on the composition and stability of soil micro-aggregates at different slope positions in purple soil were analyzed.[Methods] Two linear slopes were selected as the study site, which have an average gradient of 23%, and a horizontal length of 20 m. The whole slope was divided into 5 sample points:1 m, 5 m, 10 m, 15 m, and 20 m from the hill top to bottom. One slope where the typical wheat was cultivated was used as the treatment plot, while the other without wheat was used as the control plot. Five fractions (0.05-0.25 mm, 0.01-0.05 mm, 0.005-0.01 mm, 0.001-0.005 mm, and <0.001 mm) of soil micro-aggregates were obtained by field survey and laboratory analysis, and the micro-aggregates stability indicators included the mean weight diameter of aggregates (MWD), the mean weight soil surface area (MWSSA), and the fractal dimension (D).[Results] 1) The proportion of coarse fractions (0.01-0.25 mm) and <0.001 mm fractions in the treatment plot were higher than those in the control plot, especially at the 0 m slope position, while the 0.005-0.001 mm fraction was lower than that in the control plot. 2) In the range of 0-10 cm soil depth the significant differences (P<0.1) in MWD values were found at the 0 m, 5 m, and 20 m slope positions, with increments of 59.03%, 42.46%, 29.99%, respectively, and the MWSSA decreased compared with the control plot at the 5 m and 20 m slope positions. However, no significant changes were found at the other slope positions. The D was higher than that of the control plot except at the 5 m slope position. 3) The significant (P<0.1) increase of MWD by 38.23% was found at the 15 m slope position, while the MWSSA was lower than that of the control plot at 10 m, 15 m, and 20 m slope positions in 0-10 cm soil depth. 4) Correlation analysis indicated significant relationships between D and the proportion of <0.001 mm fraction (P<0.01).[Conculsions] Wheat roots in purple hillslope can intercept micro-aggregates of <0.001 mm and promote the polymerization from fine fractions (<0.01 mm) to coarse fractions (0.01-0.25 mm), and improve soil micro-aggregate composition. The root system of winter wheat presents the most significant effect on the stability of soil micro-aggregates at the boundary of the slope field (upslope and downslope positions).
刘静, 王勇, 侯宁, 张瀚予, 查琳, 卢修元, 李富程. 小麦根系对紫色土区坡地不同坡位土壤微团聚体特征的影响[J]. 中国水土保持科学, 2020, 18(2): 69-76.
LIU Jing, WANG Yong, HOU Ning, ZHANG Hanyu, ZHA Lin, LU Xiuyuan, LI Fucheng. Effects of wheat root on the characteristic of soil micro-aggregates at different slope positions of purple hill slope. SSWC, 2020, 18(2): 69-76.
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2020, Vol. 18 
