文章摘要
徐远慧, 冯璐, 屈媛媛, 李凯, 李梦瑶, 周楠, 徐学选.黄土丘陵沟壑区退耕还草年限对土壤性质和入渗性能的影响[J].水土保持学报,2022,36(2):57~63
黄土丘陵沟壑区退耕还草年限对土壤性质和入渗性能的影响
Effects of Different Restoration Years of Grain for Green on Soil Properties and Infiltration Performance in Loess Gully Region
投稿时间:2021-08-19  
DOI:10.13870/j.cnki.stbcxb.2022.02.007
中文关键词: 黄土丘陵沟壑区  退耕年限  根系特征  土壤团聚体  土壤入渗
英文关键词: Loess gully region  restoration years  root characteristics  soil aggregates  soil infiltration
基金项目:国家自然科学基金项目“黄土丘陵区土壤斥水性及其对降水入渗机制的影响研究”(41977426)
作者单位E-mail
徐远慧1, 冯璐1, 屈媛媛1, 李凯1, 李梦瑶1, 周楠2, 徐学选2,3 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 
xuxuexuan@nwsuaf.edu.cn 
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中文摘要:
      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。
英文摘要:
      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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