Impact of Nitrogen Input of Silage Maize on Soil Erosion and Water-stable Aggregates in Sloping Farmland

ZHAO Guiru; AN Tongxin; OUYANG Chengren; DENG Zongao; Lü Kai; YANG Youqiong; ZHOU Feng; WU Bozhi

doi:10.13870/j.cnki.stbcxb.2021.05.011

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Impact of Nitrogen Input of Silage Maize on Soil Erosion and Water-stable Aggregates in Sloping Farmland

更新时间：2025-03-12

- Impact of Nitrogen Input of Silage Maize on Soil Erosion and Water-stable Aggregates in Sloping Farmland
- Vol. 35, Issue 5, Pages: 72-79(2021)
- 作者机构：
  
  云南农业大学农学与生物技术学院云南省作物生产与智慧农业重点实验室,昆明,650201
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.05.011
  CLC： S157.4
- Published：2021
- 稿件说明：
移动端阅览
ZHAO Guiru, AN Tongxin, OUYANG Chengren, et al. Impact of Nitrogen Input of Silage Maize on Soil Erosion and Water-stable Aggregates in Sloping Farmland[J]. 2021, 35(5): 72-79.
DOI：

ZHAO Guiru, AN Tongxin, OUYANG Chengren, et al. Impact of Nitrogen Input of Silage Maize on Soil Erosion and Water-stable Aggregates in Sloping Farmland[J]. 2021, 35(5): 72-79. DOI： 10.13870/j.cnki.stbcxb.2021.05.011.

摘要

为探讨不同氮投入对红壤坡耕地水土流失及土壤水稳性团聚体的影响，在种植青贮玉米的坡耕地上设置4个不同氮投入处理（N1：300.00 kg/hm2；N2：225.00 kg/hm2；N3：150.00 kg/hm2和N4：75.00 kg/hm2），用湿筛法获得>2，1~2，0.5~1，0.25~0.5，<0.25 mm粒径的团聚体组分并计算出水稳性团聚体含量（WSA>0.25）、平均重量直径（MWD）、几何平均直径（GMD）和分形维数（PD）的含量。结果表明：（1）不同氮投入处理的坡面产流产沙特征与降雨强度关系密切，在低强度、中强度和高强度降雨条件下，N1和N2处理的径流量和产沙量均显著小于N3和N4处理（P<0.05），N2与N1处理径流量及产沙量差异均未达到显著水平（P>0.05），但在极高强度降雨下，各处理径流量和产沙量的差异均不显著（P>0.05）。（2） N2处理的WSA>0.25、MWD和GMD比其他3个处理大，而PD却比较小，此外，WSA>0.25、MWD和GMD三者之间相互存在极显著正相关性（P<0.01），而与PD、径流量和产沙量均呈现出极显著负相关关系（P<0.01）。（3） N1和N2处理土壤容重显著低于N3和N4处理的容重（P<0.05），但其孔隙度和田间持水量显著高于N3和N4处理（P<0.05）。因此，在当地常规施肥水平上减少25%氮投入量不会加剧土壤侵蚀，还可通过改善土壤物理性质以维持红壤坡耕地的生产能力。

Abstract

In order to explore the effects of different nitrogen inputs on soil erosion and soil water-stable aggregates in red soil slope farmland

four nitrogen treatments including N1(300.00 kg/hm2)

N2(225.00 kg/hm2)

N3(150.00 kg/hm2) and N4(75.00 kg/hm2) were designed

and the runoff and sediment yield were measured during the whole growth period of silage maize. Meanwhile

the aggregate components with particle size >2

1~2

0.5~1

0.25~0.5 and <0.25 mm were obtained by wet screening method

and the content of water-stable aggregates (WSA>0.25)

mean weight diameter (MWD)

geometric mean diameter (GMD) and parting dimension (PD) were calculated. The results showed that:(1) The characteristics of runoff and sediment yield of different nitrogen inputs were closely related to rainfall intensity. The runoff and sediment yields of N1 and N2 treatments were significantly lower than those of N3 and N4 treatments under the condition of low

medium and high intensity rainfall (P<0.01)

and there was no significant difference in runoff and sediment yield between N1 and N2 treatment (P>0.05). Whereas

the differences in runoff and sediment yield were not significant among different treatments under extremely high intensity rainfall (P>0.05). (2) WSA>0.25

GMD and MWD of N2 treatment were higher than those of the other three treatments

but the PD was relatively low. Additionally

there was a very significant positive correlation among WSA>0.25

MWD and GMD

but an extremely significant negative correlation with PD

runoff and sediment yield. (3) The soil bulk densities of N1 and N2 treatments were significantly lower than those of N3 and N4 treatments (P<0.01)

but the porosity and soil water holding capacity of N1 and N2 treatments were significantly higher than those of N3 and N4 treatments (P<0.05). Therefore

reducing 25% of nitrogen input at the local fertilization level will not aggravate soil erosion

and improve the soil physical properties to maintain the productivity of red soil sloping farmland.

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