Characteristics of Runoff and Sediment, Nitrogen and Phosphorus Losses Under Soil Management Measures in Sloping Farmland

CHANG Songguo1; HU Xueqin2; SHI Dongmei1; DING Wenbin1; JIANG Pin1

doi:10.13870/j.cnki.stbcxb.2016.05.006

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Characteristics of Runoff and Sediment, Nitrogen and Phosphorus Losses Under Soil Management Measures in Sloping Farmland

更新时间：2025-03-12

- Characteristics of Runoff and Sediment, Nitrogen and Phosphorus Losses Under Soil Management Measures in Sloping Farmland
- Vol. 30, Issue 5, Pages: 34-40(2016)
- 作者机构：
  
  1. 西南大学资源环境学院，西南大学水土保持生态环境研究所,重庆,400715
  2. 重庆医药高等专科学校医学技术系,重庆,401331
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2016.05.006
  CLC： S157.1
- Published：2016
- 稿件说明：
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CHANG Songguo1, HU Xueqin2, SHI Dongmei1, et al. Characteristics of Runoff and Sediment, Nitrogen and Phosphorus Losses Under Soil Management Measures in Sloping Farmland[J]. 2016, 30(5): 34-40.
DOI：

CHANG Songguo1, HU Xueqin2, SHI Dongmei1, et al. Characteristics of Runoff and Sediment, Nitrogen and Phosphorus Losses Under Soil Management Measures in Sloping Farmland[J]. 2016, 30(5): 34-40. DOI： 10.13870/j.cnki.stbcxb.2016.05.006.

摘要

采用野外径流小区定位观测法，研究次降雨条件下腐殖酸（HA）、聚丙烯酰胺（PAM）、绿肥（GM）3种土壤管理措施对紫色丘陵区坡耕地产流产沙及氮磷养分流失特征。结果表明：A型（小雨量、短历时、低雨强）降雨发生频率最高，占降雨样本数的71%，B型（大雨量、长历时、中雨强）和C型（中雨量、中历时、高雨强）降雨是引发土壤侵蚀的主要降雨类型。不同土壤管理措施下侵蚀性降雨的临界降雨量差异不明显，降雨量＞10 mm时坡面开始产流产沙。A型降雨下产流量：CK(123.49 L)＞HA(60.67 L)＞GM(53.67 L)＞PAM(32.15 L)，差异显著（P＜0.05）；产沙量：CK(30.91 g)＞HA(10.49 g)＞GM(5.50 g)＞PAM(5.12 g)，CK与GM和PAM差异显著（P＜0.05）。B型降雨下措施间产流量与产沙量差异不明显(P＞0.05)，C型降雨下产流量CK(375.45 L)＞HA(26 L)＞GM(239.00 L)＞PAM(182.10 L)，CK与PAM间差异显著，措施间产沙量差异不显著(P＞0.05)。次降雨条件下各土壤管理措施径流中氮素流失量差异显著，对照组全氮流失量是绿肥和聚丙烯酰胺2.1～2.6倍，水解氮流失量约为绿肥和聚丙烯酰胺2.7倍。不同土壤管理措施径流中磷素流失量总体趋势为：对照＞腐殖酸＞聚丙烯酰胺＞绿肥，但差异不显著（P＞0.05）。不同土壤管理措施下径流中磷的流失形态主要以水溶态为主。研究结果表明，A型降雨下聚丙烯酰胺、腐殖酸、绿肥具有减流减沙和减少氮磷流失效益显著，其中聚丙烯酰胺效益最优。

Abstract

The characteristics of runoff and sediment

nitrogen and phosphorus losses under soil management measures in sloping farmland in purple hilly region were studied by the method of field runoff plot observation. Soil management measures were humic acid (HA)

polyacrylamide (PAM)

green manure (GM)

and one control group (CK) was set. The results showed that: A-type (small rainfall

short duration

low rainfall intensity) rainfall occurred more frequently in the study area

which accounted for 71% of the total number of rainfall recorded. However B-type (large rainfall

long duration

moderate rainfall intensity) and C-type (moderate rainfall

moderate duration

high rainfall intensity) rainfall were more likely to produce runoff and sediment. Critical rainfall of erosive rainfall of soil management measures were quite approximate

which meant that the sloping farmland began to produce runoff and sediment when rainfall was more than 10 mm. The runoff yield of A-type rainfall: CK (123.49 L)＞HA (60.67 L)＞GM (53.67 L)＞PAM (32.15 L)

the difference was significant among soil management measures（P＜0.05）. Sediment yield: CK (30.91 g)＞HA (10.49 g)＞GM (5.50 g)＞PAM (5.12 g)

the sediment yield of control group was significantly different from that of GM and PAM. The difference of runoff and sediment yield among the measures were not significant under B-type rainfall. The runoff yield of A-type rainfall: CK (375.45 L)＞HA (26 L)＞GM (239.00 L)＞PAM (182.10 L)

the runoff yield of control group and PAM was significantly different. No significant difference was found in sediment yield among soil management measures. The nitrogen loss of several conservation practices varied significantly

the total nitrogen loss of control group was 2.1～2.6 times of that green manure and polyacrylamide

hydrolysis nitrogen loss was about 2.7 times of that green manure and polyacrylamide. The general trend of phosphorus loss in the runoff:The control group＞green manure＞humic acid＞polyacrylamide

however no significant difference was found among them（P＞0.05）. The loss of phosphorus in runoff is mainly in the form of water soluble phosphorus. Polyacrylamide

humic acid and green manure significangtly benefit of the reduction of runoff

sediment and nitrogen and phosphorus loss

and the polyacrylamide was most effective under the condition of A-type rainfall.

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