|
| 不同土层复配方案对土壤水稳性团聚体及有机质的影响 |
| Effects of different soil-layer compounding schemes on soil water-stable aggregates and organic matter |
| 投稿时间：2019-09-11 |
| DOI：10.13254/j.jare.2019.0455 |
| 中文关键词: 土层复配，土体结构，水稳性团聚体，土壤有机质，治沟造地工程(GLCP) |
| 英文关键词: soil-layer compounding, soil structure, water-stable aggregates, soil organic matter, Gully Land Consolidation Project(GLCP) |
| 基金项目:国家重点研发计划（2017YFC0504701）；国家自然科学基金项目（41471143） |
|
| 摘要点击次数: 1599 |
| 全文下载次数: 1809 |
| 中文摘要: |
| 为探究“治沟造地”重大工程项目（GLCP）中新增耕地快速改良的方法，达到营造良好土壤、提升新增耕地生产能力的目的，以延安羊圈沟流域的GLCP为背景，利用马兰黄土（ML）和红黏土（RC）对新造耕地0~30 cm土层进行复配试验。结果表明：当RC为20 cm、ML为10 cm（T3处理）时，复配层土壤孔隙度较对照处理增加了16.7%，容重下降了11.1%。与对照组相比，T3处理0~10、10~20、20~30 cm土层中>0.25 mm水稳性团聚体含量（W0.25）显著增加，分别增加了11.8、12.3倍和27.9倍；T2（RC为25 cm、ML为5 cm）、T3处理更利于大团聚体的形成，较对照组除在0.25~0.5、0.5~1 mm的粒级有较大增加外，在2~5 mm和>5 mm粒径范围也有明显增加。0~20 cm土层中，即使在考虑对照组前期土壤有机质积累的情况下，T3处理的土壤有机质也与对照组相近甚至更高，且高于其他试验组，表现出更好的有机质赋存能力。T3处理的玉米生长状况较好，其地上生物量最高，较对照组提高了23.9%。研究表明，当复配土壤RC为20 cm、ML为10 cm时，土壤具有最佳的性状和生产力。试验初步证明土层复配是一种可行的快速营造高质量土壤的方法，该方法可为GLCP新造地的改良及类似土地整治工程的实施提供实践参考。 |
| 英文摘要: |
| A method of rapidly improving the newly cultivated land in the region of an engineering project called the Gully Land Consolidation Project(GLCP)was explored, which could achieve the purpose of creating good soil and improving the production capacity of the newly cultivated land. In this study, based on the GLCP in the Yangjuangou catchment of Yan'an, Malan Loess(ML)and red clay(RC) were used to conduct a compounding test on the 0~30 cm soil layer in newly cultivated land. The results showed that when RC was 20 cm and ML was 10 cm(T3), the soil porosity increased by 16.7% and bulk density decreased by 11.1% compared with those of the control group. In addition, >0.25 mm water-stable aggregates in the 0~10, 10~20, and 20~30 cm soil layers were significantly increased by 11.8, 12.3, and 27.9 times, respectively, compared with those in the control group. In addition to the large increase in grain size between 0.25~0.5 mm and 0.5~1 mm, the water-stable aggregates in the particle size ranges of 2~5 mm and >5 mm also increased significantly in treatments T2(RC 25 cm, ML 5 cm)and T3, indicating that these treatments were more conducive to the formation of large aggregates. The soil organic matter(SOM)content of treatment T3 was relatively higher at different depths. Especially in the soil layer of 0~20 cm, the SOM content of treatment T3 was approximately equal to or higher than that of the control group even considering the accumulation of SOM at the early stage of the control group, showing the better SOM storage capacity of treatment T3. In addition, the growth status of maize in treatment T3 was better, and its aboveground biomass was the highest, which was 23.9% higher than that of the control group. This study showed that when RC was 20 cm and ML was 10 cm, the soil had the best properties and productivity. The experimental results preliminarily show that soil-layer compounding is a feasible method to build good soil quickly. This method also provides a practical reference for the improvement of the newly cultivated land in the GLCP and the implementation of similar land consolidation projects. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
