ISWC OpenIR  > 水保所知识产出(1956---)
孙龙1,2; 张光辉1,3; 王兵4; 栾莉莉3
Source Publication农业工程学报

为了明确黄土高原植被恢复后不断蓄积的枯落物对土壤分离过程的影响,论文选取10、15、20、30、40a 退耕
年限刺槐林样地及对照样地,采集180 个土壤样品用于土壤分离试验,在6 组侵蚀动力条件下进行变坡水槽冲刷试验,
结果表明:随着退耕年限的增大,刺槐林土壤结构趋于稳定且疏松多孔,40 年刺槐林地与对照样地相比:容重降低12.9%、
均值随着林龄呈指数函数递减(R2 = 0.82、P < 0.05)。在退耕0~40 年范围内,在0~15 a 内土壤分离能力下降迅速,对
照、10 a 刺槐林地、15 年刺槐林地之间的土壤分离能力差异显著(P < 0.05),退耕15 a 以后土壤分离能力趋于稳定。40 a
4.78 Pa 之间。细沟可蚀性的变化趋势与土壤分离能力变化趋势相似,相比临界剪切力的变化,细沟可蚀性的变化更能反

Other Abstract

Plant litter has been accumulated greatly along with vegetation restoration on the Loess Plateau. Besides covering
soil surface, plant litter can be incorporated into topsoil under natural circumstances by soil splash, sediment deposition, and
soil-dwelling animal activities. The distribution (covering soil surface or incorporated into surface soil) and the decomposition
of plant litter can modify soil physical properties (including soil detachment capacity and soil erosion resistance) which are
closely related to soil detachment process by overland flow. This study was conducted to investigate the effect of vegetation
restoration on soil detachment process for black locust (Robinia pseudoacacia L.) stand with different ages of returning
farmland on the Loess Plateau. The experiments were performed in the Zhifanggou small watershed (36°46'28"-36°46'42"N,
109°13'46"-109°16'03"E) in August, 2015. After a complete watershed survey, altogether 6 sampling sites were selected,
including 1 corn (Zea mays L.) field and 5 black locust stands of 10, 15, 20, 30, and 40 years. Soil samples were collected from
the top 5 cm soil layer using a circular steel ring with 10.0 cm diameter and 5.0 cm depth. Soil detachment was measured in a
4.0 m long, 0.35 m wide flume. Prior to the test of soil detachment capacity, soil samples were saturated in a container for 8 h
and drained for 12 h. Then the soil samples were inserted into a hole (0.5 m away from the outlet of flume) on the flume bed
and were scoured by flowing water under designed flow shear stress. A total of 180 soil samples were collected from different
aged black locust stands and scoured under 6 flow shear stresses. In this study, 6 combinations of flow rates and slopes were
applied to obtain 6 different flow shear stresses (5.4-17.4Pa) with similar intervals. Rill erodibility is defined as the increase in
soil detachment capacity per unit increase in flow shear stress. Critical shear stress is a threshold parameter defined as the
value above which a rapid increase in soil detachment capacity per unit increase in shear stress occurs. When the measured
detachment capacity was plotted against the flow shear stress, rill erodibility and critical shear stress could be determined from
the slope of the fitted straight line and its intercept on the X axis. The results showed that the density of plant litter in 0-5 cm
surface soil was 0.07, 0.18, 0.32, 0.29 and 0.17 kg/m2 for 10, 15, 20, 30, and 40-year-old black locust stands, respectively, with
the mean value of 0.20 kg/m2. The 40-year-old black locust stands had more capillary porosities, soil organic matter, and water
stable aggregates, and smaller soil bulk density. Soil detachment capacity decreased by 49.8%, 73.9%, 85.0%, 86.0%, and
87.0% for 10, 15, 20, 30, and 40-year-old black locust stands, respectively, compared to the control. The soil detachment
capacity decreased significantly over time as an exponential function (R2=0.97, P=0.006). The control (corn field) had the
biggest rill erodibility (0.29 s/m), and the 40-year-old black locust stand had the smallest rill erodibility (0.04 s/m). Compared
to the control, the rill erodibility for 40-year-old black locust stand was reduced by 86.3%. The black locust stand with 20
years had the biggest critical shear stress (4.78 Pa), and the control had the smallest critical shear stress (4.15 Pa). The critical
shear stress increased by 10.1% for 40-year-old black locust stand compared to the control. The critical shear stress increased
significantly with litter density as a linear function (R2=0.67, P=0.046). Rill erodibility was better than critical shear stress in
the respect of reflecting the variation of soil detachment. The soil-plant litter system has a larger erosion resistance to flowing
water than the control. Importantly, the soil-root system may have a larger structural stability and erosion resistance to flowing
water than soil-plant litter system.

Keyword侵蚀 试验 土壤 黄土高原 退耕还林 土壤分离能力 细沟可蚀性 临界剪切力
Indexed By中文核心期刊要目总览
Document Type期刊论文
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
孙龙,张光辉,王兵,等. 黄土高原不同退耕年限刺槐林地土壤侵蚀阻力[J]. 农业工程学报,2017,33(10):191-197.
APA 孙龙,张光辉,王兵,&栾莉莉.(2017).黄土高原不同退耕年限刺槐林地土壤侵蚀阻力.农业工程学报,33(10),191-197.
MLA 孙龙,et al."黄土高原不同退耕年限刺槐林地土壤侵蚀阻力".农业工程学报 33.10(2017):191-197.
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