压实对基质含水量和时空异质性的影响
发布时间：2018-08-07 14:11
【摘要】：为了将基质压实发展为改善立地、促进生产的技术手段,运用在农林业生产中,研究不同程度压实后基质持水能力及水分动态变化特征。试验布设5个试验槽,标记为T1~T5,T1为对照,基质自然沉降,T2~T5经过碾压后,容重分别为对照容重的1.25、1.50、1.75、2.00倍。2012~2013年定期测量1 m内基质体积含水量,通过变异系数评价含水量的时间变异性和垂直、水平方向上的空间变异性。结果表明,随着压实程度增加,基质含水量显著增加,时间变异系数和垂直、水平方向上的空间变异系数下降。随着植物根系的发展,T1~T4深层含水量的时间变异系数升高。T5浅层含水量的时间变异系数和水平变异系数均较高,由于含水量的时间和水平异质性可以反映根系活动,结果表明重度压实限制植物根系发展。
[Abstract]:In order to develop the matrix compaction into the technical means of improving site and promoting production, the characteristics of water holding capacity and water dynamic change of matrix after different degree compaction were studied in agriculture and forestry production. Five test tanks were set up and labeled as T1T5T1as control. After compaction, the bulk density of natural sedimentation T2T5 of the control was 1.25 / 1.50 / 1.752.00 times as much as that of the control, respectively. The volume water content of 1 m substrate was measured regularly from 2012to 2013. The temporal variability, vertical and horizontal spatial variability of water content were evaluated by coefficient of variation. The results showed that with the increase of compaction degree, the moisture content of the matrix increased significantly, and the temporal variation coefficient, vertical and horizontal spatial variation coefficient decreased. With the development of plant root system, the time variation coefficient of deep water content of T1T4 increased. The temporal variation coefficient and horizontal variation coefficient of shallow water content in T5 layer were higher. The time and level heterogeneity of water content could reflect root activity. The results showed that severe compaction limited the development of plant roots.
【作者单位】： 轻工业环境保护研究所;北京林业大学水土保持学院;中科鼎实环境工程有限公司;
【基金】：国家林业公益性行业科研专项“建设工程损毁林地植被恢复关键技术研究与示范”(200904030)
【分类号】：S152
本文编号：2170276
[Abstract]:In order to develop the matrix compaction into the technical means of improving site and promoting production, the characteristics of water holding capacity and water dynamic change of matrix after different degree compaction were studied in agriculture and forestry production. Five test tanks were set up and labeled as T1T5T1as control. After compaction, the bulk density of natural sedimentation T2T5 of the control was 1.25 / 1.50 / 1.752.00 times as much as that of the control, respectively. The volume water content of 1 m substrate was measured regularly from 2012to 2013. The temporal variability, vertical and horizontal spatial variability of water content were evaluated by coefficient of variation. The results showed that with the increase of compaction degree, the moisture content of the matrix increased significantly, and the temporal variation coefficient, vertical and horizontal spatial variation coefficient decreased. With the development of plant root system, the time variation coefficient of deep water content of T1T4 increased. The temporal variation coefficient and horizontal variation coefficient of shallow water content in T5 layer were higher. The time and level heterogeneity of water content could reflect root activity. The results showed that severe compaction limited the development of plant roots.
【作者单位】： 轻工业环境保护研究所;北京林业大学水土保持学院;中科鼎实环境工程有限公司;
【基金】：国家林业公益性行业科研专项“建设工程损毁林地植被恢复关键技术研究与示范”(200904030)
【分类号】：S152
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