干湿循环下植生固沙材料N、P、K素释放特征研究

• 作 者: 曲烈 杨久俊 乐俐 刘洪丽
• 机 构: 天津市软土环境与工程特性重点实验室/天津城市建设学院材料科学与工程系,
• 出 处: 干旱区资源与环境
• 发表日期: 2013年01期
• 关键词: 干湿循环 释放特征 控释肥 吸水剂 植生固沙材料 包膜肥料 流域泥沙 固化作用 水土流失问题 土壤吸附

采用沙柱法研究了不同干湿循环条件下水泥-土基植生固沙材料N、P、K素的释放特征。结果表明:加速干湿循环组N素累计淋出量初期较低和后期较高,N素中期出现较高的峰值与增加温度湿度有关;P、K素累计淋出量初期和后期均较低,中期淋出率峰值向后推移。P、K素初期和后期累计淋出量较低与土壤吸附固化作用有关。

The sand column method was used to study the release characteristics of N, P, K in cement-soil bed-fixing phytolith under different dry-wet cycles. The results showed that in the accelerated wet-dry cycle, the accumulative leaching amount of N was lower at the early stage and higher at the late stage, while the peak at the middle stage was related to the increase of temperature and humidity. The cumulative leaching of P and K was lower at the early and later stages , The peak of the mid-term leaching rate backward. P, K early and late cumulative leaching amount is lower and the role of soil adsorption and curing.