| 胡廷飞,王辉,谭帅.再生水灌溉模式对土壤团聚体及其有机碳分布的影响[J].农业环境科学学报,2020,39(1):143-151. |
| 再生水灌溉模式对土壤团聚体及其有机碳分布的影响 |
| Distribution characteristics of soil aggregates and their associated organic carbon under different irrigation modes with reclaimed water |
| 投稿时间：2019-08-31 |
| DOI：10.11654/jaes.2019-0955 |
| 中文关键词: 再生水 灌溉模式 团聚体 有机碳 |
| 英文关键词: reclaimed water irrigation mode soil aggregate soil organic carbon |
| 基金项目:国家自然科学基金项目（41471185）；湖南省教育厅重点项目（15A084）；湖南省重点研发计划项目（2016JC2032） |
|
| 摘要点击次数: 1665 |
| 全文下载次数: 1409 |
| 中文摘要: |
| 为揭示再生水灌溉模式对土壤团聚体及其有机碳含量的影响，以潮土、紫色土和水稻土为研究对象，清水灌溉为对照（CK），研究了再生水灌溉（RW）、再生水-清水混合灌溉（RW-2）及再生水-清水交替灌溉（ARW）3种灌溉模式下土壤团聚体含量及稳定性、土壤总有机碳、各粒级团聚体有机碳及其对土壤总有机碳贡献率的差异。结果表明：3种灌溉模式下，3种土壤团聚体均以大团聚体（>0.25 mm）为主，干筛和湿筛处理大团聚体比重分别为89.56%~97.91%和67.95%~81.81%；相比CK，潮土和水稻土各处理团聚体平均质量直径（MWD）及几何平均直径（GMD）均降低，但水稻土差异不显著，紫色土MWD和GMD则显著增长（P<0.05）；潮土和紫色土各处理总有机碳含量及大团聚体有机碳含量均显著增长（P<0.05），水稻土变化不显著；3种土壤大团聚体有机碳含量是微团聚体有机碳含量的8.83~29.95倍，前者对土壤总有机碳含量的贡献率为89.42%~97.09%，后者贡献率为2.91%~10.58%。从改善土壤团聚状况及有机碳固持方面考虑，在紫色土和水稻土上进行再生水灌溉更适合，其中紫色土以RW模式改善效果最好，水稻土更适合采用RW-2模式。 |
| 英文摘要: |
| The effects of reclaimed water irrigation modes on the content and stability of soil aggregates, total soil organic carbon, and distribution of aggregate-associated organic carbon in three subtropical soils, i.e., tidal soil, purple soil and paddy soil, were investigated. An indoor simulation experiment was conducted at the irrigation and drainage laboratory of the college of water resources and civil engineering of Hunan agricultural university. Four treatments were designed as follows:fresh water irrigation(CK), reclaimed water irrigation(RW), alternative irrigation of fresh water and reclaimed water(ARW), and mixed irrigation of fresh water and reclaimed water(RW-2). Soil samples were collected from 0~15 cm soil layers in the plots of the four treatments for analysis. Using the dry sieving and wet sieving method, the proportions of aggregates >5 mm, 2~5 mm, 0.5~2 mm, 0.25~0.5 mm, and <0.25 mm in size were obtained, and then the mean weight diameter(MWD) and geometric mean diameter(GMD) of the fractions of soil aggregates were calculated. The organic carbon contents of the soil and aggregates were also discussed. The results showed that regardless of treatment, the aggregates of three subtropical soils were dominated by macroaggregates(>0.25 mm). The proportion of macroaggregates were 89.56%~97.91% and 67.95%~81.81% by dry sieve and wet sieve, respectively. Compared with CK, the MWD and GMD of tidal soil and paddy soil aggregates decreased in the three irrigation treatments, while that of purple soil increased; the differences between tidal soil and purple soil were significant(P<0.05). The total organic carbon and macroaggregate-associated organic carbon contents in tidal soil and purple soil increased significantly(P<0.05), while that of paddy soil did not change significantly. The organic carbon content of macroaggregates was 8.83~29.95 times higher than that of microaggregates. The former contributed 89.42%~97.09% of the total soil organic carbon content while the latter contributed 2.91%~10.58%. We conclude that purple soil and paddy soil are more suitable for RW. RW improves purple soil agglomeration and organic carbon retention, while paddy soil is more suitable for RW-2. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
