Effects of Different Restoration Years of Grain for Green on Soil Properties and Infiltration Performance in Loess Gully Region

XU Yuanhui; FENG Lu; QU Yuanyuan; LI Kai; LI Mengyao; ZHOU Nan; XU Xuexuan

doi:10.13870/j.cnki.stbcxb.2022.02.007

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Effects of Different Restoration Years of Grain for Green on Soil Properties and Infiltration Performance in Loess Gully Region

更新时间：2024-11-07

- Effects of Different Restoration Years of Grain for Green on Soil Properties and Infiltration Performance in Loess Gully Region
- Vol. 36, Issue 2, Pages: 57-63(2022)
- 作者机构：
  
  1. 西北农林科技大学草业与草原学院, 陕西杨凌,712100
  2. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  3. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.02.007
  CLC： S157.2
- Published：2022
- 稿件说明：
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XU Yuanhui, FENG Lu, QU Yuanyuan, et al. Effects of Different Restoration Years of Grain for Green on Soil Properties and Infiltration Performance in Loess Gully Region[J]. 2022, 36(2): 57-63.
DOI：

XU Yuanhui, FENG Lu, QU Yuanyuan, et al. Effects of Different Restoration Years of Grain for Green on Soil Properties and Infiltration Performance in Loess Gully Region[J]. 2022, 36(2): 57-63. DOI： 10.13870/j.cnki.stbcxb.2022.02.007.

摘要

我国退耕还林(草)工程实施20多年来取得显著成效

为评估退耕还林(草)对土壤性质和入渗性能的改善效果及其内在机理

取黄土丘陵沟壑区农地和退耕年限为5年(C5 a)、15年(C15 a)和25年(C25 a)撂荒草地的0-30 cm土壤测定其水稳性团聚体特征、根系特征和入渗速率等性质

并分析了影响不同撂荒年限草地土壤的入渗性能的因素。结果表明

不同撂荒年限草地有机质含量(SOM)、全氮含量、根系性状均表现为C25 a>C15 a>农地≈C5 a;农地0-30 cm土壤大团聚体的平均重量直径(MWD)为0.78 mm

几何平均直径(GMD)为0.20 mm

分形维数(D)为2.89

土壤初始入渗率(IIR)和稳定入渗率(SIR)测定结果分别为7.80

2.58 mm/min;5年草地0-30 cm土壤大团聚体的平均重量直径(MWD)为2.03 mm

几何平均直径(GMD)为0.62 mm

分形维数(D)为2.73

土壤初始入渗率(IIR)和稳定入渗率(SIR)测定结果分别为6.36

3.21 mm/min;15年草地0-30 cm土壤大团聚体的平均重量直径(MWD)为2.25 mm

几何平均直径(GMD)为0.77 mm

分形维数(D)为2.69

土壤初始入渗率(IIR)和稳定入渗率(SIR)测定结果分别为11.12

4.33 mm/min;25年草地0-30 cm土壤大团聚体的平均重量直径(MWD)为2.44 mm

几何平均直径 (GMD)为0.93 mm

分形维数(D)为2.64

土壤初始入渗率(IIR) 和稳定入渗率(SIR)测定结果分别为13.67

5.93 mm/min;土壤SIR与SOM、容重、>5 mm粒级的团聚体含量呈极显著正相关关系(P<0.01)。退耕还草对土壤的改善作用随着退耕年限延长而不断增强

因此在水土流失严重地区应加以维护退耕还草的现有成果

并加强对退耕还草初期(5 a)草地的人工干预和管理以兑现其后期潜在的生态价值。

Abstract

Remarkable achievement has been obtained since the implementation of the Grain for Green project in China. Aiming to explore the improvement effect of restoration years on soil properties and infiltration performance and its mechanism

the water stable aggregate characteristics

root characteristics and infiltration rate of 30-cm-depth farmland and grassland soils with 5-year (C5 a)

15-year (C15 a) and 25-year (C25 a) restoration in the Loess Hilly and gully area were measured. The factors affecting soil infiltration were analyzed. The results showed that the organic matter content (SOM)

total nitrogen content and root traits of grassland soil with different abandoned years were C25 a>C15 a>farmland≈C5 a. The mean weight diameter (MWD)

geometric mean diameter (GMD)

fractal dimension (D) of 0-30 cm soil aggregates and initial infiltration rate (IIR) and stable infiltration rate (SIR) were 0.78

0.2 mm

2.89

7.80 and 2.58 mm/min for farmland; 2.03

0.62 mm

2.73

6.36 and 3.21 mm/min for 5-year grassland; 2.25

0.77 mm

2.69

11.12 and 4.33 mm/min for 15-year grassland; 2.44

0.93 mm

2.64

13.67 and 5.93 mm/min for 25-year grassland

respectively. There was a significant positive correlation between soil SIR and SOM

bulk density and aggregate content of >5 mm (P<0.01). The improvement effect to soil of restoration continues to increase with the extending years of Grain for Green. Therefore

the existing achievements of Grain for Green should be maintained in areas with serious soil and water loss

and the manual intervention and management in the early (5-year) stage of restoration should be strengthened to realize its potential ecological value in the later stages.

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