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| Effects of roots in different vegetation types on soil water distribution |
| CHEN Yuxin, ZHENG Bofu, FU He, LUO Chengkang, JIANG Yihui, ZHU Jinqi |
1. School of Resources and Environment, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, 330031, Nanchang, China;
2. Jiangxi Ecological Civilization Research Institute, 330031, Nanchang, China |
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Abstract [Background] As one of the ecological disasters in the world, shallow landslides are closely related to the distribution of water in soil. Therefore, a good water distribution pattern in the soil is helpful to improving the ecological risk resistance. In this paper, the effects of roots of different vegetation types on soil water distribution were analyzed.[Methods] Taking the typical coniferous and broadleaved mixed forest, Phyllostachy sheterocycla forest and fallow land in Wuning county in the north of Jiangxi province as research objects, the soil water distribution was observed by staining tracer experiment. Soil and root samples were collected to determine the soil physical and chemical properties, plant root characteristics, soil water storage capacity, stability of soil aggregatesand other indicatorsof 0-20 cm, 20-40 cm, and 4060 cm soil layers, respectively. Combined with stainingcondition, the multiple effects of root and soil characteristic indexes on soil water distribution were analyzed.[Results] 1) Both coniferous and broadleaved mixed forest and P. heterocycla forest showed large area staining in 0-60 cm soil layer, but only in 0-20 cm soil layer in fallow land. The more the soil layer of the root system, the more prominent the stained area. 2) Soil water content, maximum water-holding capacity, saturatedmoisture content, mean weight diameter and geometric mean diameter decreased significantly with the increase of soil depth. 3) The number of roots in coniferous and broadleaved mixed forest and P. heterocycla forest was 16.96 times and 30.95 times as much as that in fallow land, respectively (P<0.05). The water storage capacity (maximum water-holding capacity) of the deep layer (40-60 cm) was 3% and 10% higher than that in fallow land, respectively, and the soil aggregate stability (mean weight diameter) was 13% and 23% higher than that in fallow land, respectively. 4) Root characteristic index, soil water storage capacity index and soil aggregate stability index were positively correlated with dyeing area ratio (P<0.05).[Conculsions] In the three types of experimental plots, the rich roots in the soil obviously promote the soil water storage capacity and the stability of soil aggregates, and further promote the water distribution in the soil, thusthe water distribution of coniferous and broadleaved mixed forest and P. heterocycla forest is stronger than that of fallow land.In order to effectively improve the function of regional soil and water conservation and ecological risk resistance, it is necessary to strengthen the management and protection of forest resources and improve the diversity of woodland vegetation so as to increase the distribution density and depth of underground roots.
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Received: 28 October 2021
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