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刺槐林是中国北方丘陵半干旱区典型的生态防护林树种之一。通过自然降雨径流场定位观测试验,本文对辽宁西部地区(1850-12225E,4024-4234N)刺槐生态防护林及其采伐迹地的产流、产沙特征和土壤水分动态变化规律进行了定量研究。采伐迹地与刺槐林地相比二者之间的产流量和产沙量存在显著差异,采伐迹地的产流量和产沙量比刺槐林地分别增加40%-177%和180%-400%。典型降雨产流水文过程线显示,刺槐林地径流峰值比采伐迹地低1.0-2.5?0-3m3穝-1,且径流峰值出现的时间比采伐迹地滞后10-20min。谐波分析表明,刺槐林地与采伐迹地土壤含水量随年内降水量变化分干、湿两季,呈周期性变化,刺槐林地土壤年平均含水量比采伐迹地高2.3%。研究结果表明:刺槐生态防护林具有涵养水源、增加土壤水分、减少地表径流与土壤侵蚀的重要作用。图2表4参12。
Robinia pseudoacacia is one of the typical species of ecological shelterbelt in the semi-arid hilly region of northern China. Through the observation of natural rainfall runoff field, this paper quantitatively studied the law of runoff and sediment production and the dynamic change of soil moisture in the ecological shelterbelts and their deforested areas in western Liaoning (1850-12225E, 4024-4234N). Compared with the locusts, the yield and sediment yield were significantly different between the deforested land and the locust locusts. The yield and sediment yield of the deforested land increased by 40% -177% and 180% -400% respectively than that of the locusts. The typical rainfall runoff and hydrological process line shows that the peak value of Robinia pseudoacacia forest runoff is 1.0-2.5? 0-3m3? -1 lower than that of the logging, and the peak time of runoff appears lag 10- 20min later than that of the logging. Harmonic analysis showed that the soil moisture of Robinia pseudoacacia forestland and deforested land changed with the variation of annual precipitation in dry and wet seasons, and the annual average soil water content of Robinia pseudoacacia forest land was 2.3% higher than that of deforested land. The results showed that the Robinia pseudoacacia ecological shelter forest has the important function of conserving water, increasing soil moisture, reducing surface runoff and soil erosion. Figure 2 Table 4 Reference 12.