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| Effects of crop structure on nitrogen and phosphorus output in farmland catchment area of Paleozoic area of Dali |
| Received:July 09, 2024 |
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| KeyWord:agricultural catchment area;nitrogen and phosphorus export;cropping structure;Erhai basin |
| Author Name | Affiliation | E-mail | | ZHANG Zihan | College of Resources and Environmental Sciences, State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Ecological Environment of Farmland in Hebei, Hebei Agricultural University, Baoding 071000, China | | | ZHANG Xulin | College of Resources and Environmental Sciences, State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Ecological Environment of Farmland in Hebei, Hebei Agricultural University, Baoding 071000, China | | | LOU Yang | Yunnan Agricultural University, Kunming 650500, China | | | YIN Gaofei | College of Resources and Environmental Sciences, State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Ecological Environment of Farmland in Hebei, Hebei Agricultural University, Baoding 071000, China | | | FENG Peipei | College of Resources and Environmental Sciences, State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Ecological Environment of Farmland in Hebei, Hebei Agricultural University, Baoding 071000, China | | | WANG Hao | College of Resources and Environmental Sciences, State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Ecological Environment of Farmland in Hebei, Hebei Agricultural University, Baoding 071000, China | | | LI Wenchao | College of Resources and Environmental Sciences, State Key Laboratory of North China Crop Improvement and Regulation, Key Laboratory of Ecological Environment of Farmland in Hebei, Hebei Agricultural University, Baoding 071000, China | dachao279@126.com |
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| Abstract: |
| Aiming at the problem of agricultural surface pollution in the watershed caused by excessive nitrogen and phosphorus inputs from the plantation industry, the study selected the agricultural catchment area（Gusheng Area）of the Erhai Basin as the object of the study, and monitored the dynamics of nitrogen and phosphorus in the ditches of the agricultural catchment area by encrypting the positioning, in which the agricultural catchment area was set up according to the crop structure in the upper reaches of the SYX area （planting seed maize and vegetables）, in the mid-reach of the DLL area（planting fresh maize and vegetables）, and in the lower reaches of the SFQ（planting rice）, to analyse the effect of crop structure on nitrogen and phosphorus output. The results showed that spatially, the mean concentration of total nitrogen in ditch runoff showed the largest in the fresh corn and vegetable growing area（21.11 mg·L-1）, the second in the rice growing area（17.43 mg·L-1）, and the lowest in the seed corn and vegetable growing area（13.88 mg·L-1）. The average concentration of total phosphorus increased from upstream to downstream, and downstream（0.59 mg·L-1）, midstream（0.58 mg·L-1）was significantly higher than that of upstream（0.41 mg·L-1）. Temporally, total nitrogen output showed August（20.42 mg·L-1）> June（15.54 mg·L-1）>July（12.79 mg·L-1）and total phosphorus output showed August（0.66 mg·L-1）> July（0.62 mg·L-1）> June（0.30 mg·L-1）. For different crop structure zones, the total nitrogen output in the middle and upper reaches was concentrated in August, while the total nitrogen output in the lower reaches was mostly concentrated in June; the total phosphorus output in the upper reaches was concentrated in July, while that in the middle and lower reaches was mostly concentrated in August. The temporal and spatial changes of nitrogen and phosphorus outputs varied in different crop structure sub-regions. The crop structure consisting of fresh maize and vegetables had the greatest influence on the output of total nitrogen and nitrate nitrogen, while the cultivation of rice had a more obvious influence on the output of ammoniacal nitrogen, total phosphorus and dissolved phosphorus. There are obvious differences in the loss characteristics of nitrogen and phosphorus in the runoff from ditches in the agricultural catchment area, and appropriate prevention and control strategies for nitrogen and phosphorus loss can be adopted according to the spatial topographical differences, crop structure and characteristics of agricultural ditches in the study area, and controlling the runoff and reducing soil erosion are of great significance in improving the efficiency of prevention and control of nitrogen and phosphorus entering the lake. |
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