[1]LI Tingting,WEI Caihui,DONG Wenbin,et al.Effects of Sod Culture and Slope on Losses of Nitrogen and Phosphorus in the Surface Runoff of Orchards of Northeast Guangxi[J].Research of Soil and Water Conservation,2021,28(03):59-64.
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Effects of Sod Culture and Slope on Losses of Nitrogen and Phosphorus in the Surface Runoff of Orchards of Northeast Guangxi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 03
Page number:
59-64
Column:
Public date:
2021-04-20
- Title:
- Effects of Sod Culture and Slope on Losses of Nitrogen and Phosphorus in the Surface Runoff of Orchards of Northeast Guangxi
- Keywords:
- sod culture; slope; total nitrogen loss; total phosphorus loss
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- In order to provide data support and scientific basis for nutrient loss control in Northeast Guangxi, the losses of nitrogen and phosphorus in surface runoff of orchard were studied. Under the condition of natural rainfall in the field, Paspalum thunbergii and Ageratum conyzoides were intercropped in Kumquat orchards under different slope conditions(i.e.,12°,23°,42°), and the effects of the losses of two kinds of grass culture components were compared and analyzed. The results showed that, with the increase of slope gradient, the average contents of total nitrogen, total phosphorus, ammonia nitrogen and nitrate nitrogen in the runoff of the same life grass cultivation increased. Compared with clear ploughing, Paspalum thunbergii reduced the losses of total nitrogen, total phosphorus, ammonia nitrogen and nitrate nitrogen by 4.61%～24.55%, 15.30%～26.49%, 9.97%～48.03% and 17.46%～96.46%, respectively. The losses of total nitrogen, total phosphorus, ammonia nitrogen and nitrate nitrogen of Ageratum conyzoides were 9.15%～16.17%, 10.09%～13.16%, 1.90%～33.19% and 11.67%～19.41%, respectively. The effect of grass growth on the losses of total nitrogen and total phosphorus was significant(p< 0.001). With the increase of slope gradient, the inhibition of grass cultivation on the amount of nitrogen and phosphorus loss decreased, while the promotion of slope on the amount of nitrogen and phosphorus loss increased. The relative contribution index of Paspalum thunbergii to the losses of total nitrogen and total phosphorus was higher than that of Ageratum conyzoides. With the increase of slope gradient, the soil nutrient content of the same life grass decreased. The control effect of Paspalum thunbergii on nutrient loss was better than that of Ageratum conyzoides. The existence of grass cultivation can weaken the increasing effect of slope on the losses of nitrogen and phosphorus in surface runoff to some extent.
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Last Update:
2021-04-20