Study on the adsorption and desorption characteristics of Phosphorus in Ryegrass and natural grasses in sloping land of Rainy Area of West China

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Sun, Bowen^1 ; Wang, Qianxin^1 ; Zhao, Qin^2 ; Yang, Yuanxiang^1 ; Sheng, Yuzhang^1

College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan

611130, China^1

Sichuan Provincial Soil and Water Conservation Ecological Environment Monitoring Station, Chengdu, Sichuan

610041, China^2

关键词: Adsorption amounts;    Adsorption and desorptions;    Adsorption capacities;    Adsorption coefficients;    Adsorption dynamics;    Available phosphorus;    Equilibrium adsorption capacity;    Natural grassland;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/4/042126/pdf
DOI  :  10.1088/1755-1315/295/4/042126

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this study, runoff plot test was carried out in Rainy Area of West China to study the adsorption and analytical characteristics of phosphorus on ryegxass(Lolium perenne L.) and natural grass soil planted on different slopes. The results showed that the content of available phosphorus and total p in ryegrass was higher than that in natural grassland. Langmuir equation can well fit the adsorption of phosphorus on soil, and the maximum adsorption capacity and adsorption coefficient are 434.76mg/kg and 0.57, respectively, which all appear in ryegrass field. The secondary kinetic equation can well fit the adsorption dynamic characteristics of phosphorus. The equilibrium adsorption capacity and adsorption rate are between 44.64∼49.06 mg/kg and 0.0258∼0.0466 kg/(mgh), and the maximum value is in ryegrass field. The phosphorus analysis rate of the soil in the study area was 30.93∼34.41%, which showed that the natural grassland was > ryegrass. At the same adsorption amount, the soil phosphorus content was > ryegrass. The results showed that the soil phosphorus fixation effect of ryegrass was good. The rational planting of ryegrass on the slope of yuping district in west China can effectively reduce the pollution of phosphorus from non-point sources.