黄河源高寒草甸封育条件下的土壤持水能力

发布时间：2018-07-11 09:50

本文选题：黄河源 + 封育　；参考：《中国草地学报》2017年05期

【摘要】：以青海省玛沁县不同封育年限与自然放牧的高寒草甸为研究对象,通过对土壤容重、土壤饱和持水量、田间持水量及毛管持水量等指标监测,分析不同封育年限下高寒草甸的土壤持水能力及与环境因素的关系。结果表明:随着封育年限延长,封育样地0~40cm土层土壤持水量增加,其中0~10cm土层的土壤持水量高于10~20cm和20~40cm;封育12a后土壤饱和持水量、田间持水量、毛管持水量分别增加11.34mm、15.14mm、15.05mm,分别按0.95mm/a、1.26mm/a、1.25mm/a的速率增加;土壤饱和持水量、田间持水量和毛管持水量与容重呈极显著负相关(P0.01),与有机质及地下生物量呈极显著或显著性正相关(P0.05或P0.01);土壤持水能力在垂直方向表现为表层高于深层,在封育禁牧梯度上表现为封育高于未封育。研究表明,封育能提高土壤持水能力。
[Abstract]:The alpine meadow with different fencing years and natural grazing in Maqin County of Qinghai Province was studied. The soil bulk density, saturated soil water holding capacity, field water holding capacity and capillary water holding capacity were monitored. The relationship between soil water holding capacity of alpine meadow and environmental factors was analyzed. The results showed that the soil water holding capacity of 0~40cm soil layer increased with the extension of fencing time, and the soil water holding capacity of 0~10cm soil layer was higher than that of 10~20cm and 20 ~ 40 cm soil layer, and the saturated soil water holding capacity and field water holding capacity of 0~10cm soil layer were higher than that of 10~20cm and 20 ~ 40 cm soil layer after 12 years of closure. The capillary water holding capacity increased by 11.34mm / 15.14mm / 15.05mm, respectively, and increased at the rate of 0.95mm / a 1.26mm / a 1.25mm / a, respectively. Field water holding capacity and capillary water holding capacity were negatively correlated with bulk density (P0.01), and were significantly or positively correlated with organic matter and underground biomass (P0.05 or P0.01), and soil water holding capacity in vertical direction was higher than that in deep layer. On the gradients of fencing and forbidding, fencing was higher than that of unfenced. The results show that the soil water holding capacity can be improved by fencing.
【作者单位】：中国科学院西北高原生物研究所;中国科学院大学;中国科学院高原生物适应与进化重点实验室;
【基金】：国家重点研究计划(2016YFC0501802) 青海省国际合作项目(2015-HZ-801)项目青海省自然基金(2016-ZJ-943Q)
【分类号】：S812.2

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