| 亚热带低丘区氮磷流失浓度和形态的季节性变化特点* |
| |
| 引用本文： | 姜佳燕,吴颖琦,顾国平,章明奎.亚热带低丘区氮磷流失浓度和形态的季节性变化特点*[J].现代农业科技,2020(2). |
| |
| 作者姓名： | 姜佳燕 吴颖琦 顾国平 章明奎 |
| |
| 作者单位： | 绍兴市越城区农业农村局,绍兴市越城区农业农村局,绍兴市农业科学研究院,浙江大学环境与资源学院 |
| |
| 摘 要： | 为了解不同利用方式土地氮磷流失的规律,对位于亚热带低丘区的3种不同土地利用方式小沟谷中不同季节的溪流水样进行了动态分析。结果表明,地表径流中氮磷的化学形态和浓度因流域土地利用方式、地表径流强度和季节的不同有较大的变化。总磷(TP)浓度一般是旱地>水田>林地,非雨期(地表径流强度较低)地表径流磷主要以溶解态排出,雨期(地表径流强度较高)磷主要以颗粒态(PP)排出；地表径流中TP浓度：雨期>>非雨期,夏季>秋季>春季>冬季,TP的流失具冲刷型特征；可溶性总磷(DTP)：水田>旱地>林地,雨期略高于非雨期,夏、秋季>春季>冬季；PP／TP：雨期>非雨期。可溶性全氮(DTN)浓度：水田>旱地>林地,夏、秋季>春季>冬季,非雨期>雨期；有机氮(OM－N)浓度：水田>林地>旱地；NH4－N占DTN的比例：水田>旱地>林地；NO3－N占DTN的比例：旱地>林地>水田。
|
| 关 键 词： | 径流 氮和磷 化学形态 季节变化 |
| 收稿时间： | 2019/9/26 0:00:00 |
| 修稿时间： | 2019/9/26 0:00:00 |
Seasonal Variations of concentration and chemical forms of P and N in runoff from Low-hilly area of the subtropics |
| |
| Authors: | Gu Guo-ping and |
| |
| Institution: | Shaoxing Academy of Agricultural Sciences, |
| |
| Abstract: | In order to understand N and P runoff patterns from different lands, seasonal variations of concentrations of total P (TP), total dissolved P (TDP), particulate P (PP), dissolved total N(DTN), organic matter-associated N (OM-N), NO3-N, and NH4-N in surface runoff were monitored over one year period at 3 small basins with different land-use in low-hilly area of the subtropics. A total of 101 surface runoff samples were collected for measuring P and N. The results showed that concentration and chemical forms of P and N in runoff varied greatly with land use type, rainfall, and season. The TP concentration in runoff decreased in the order of upland, paddy field, and forestland. Dissolved P was major form of the TP in runoff during rainfall, while for non-rainfall the PP was major form of the TP in runoff. The runoff loss of the TP was mainly caused by soil erosion, the concentration of the TP in runoff was summer > autumn > spring > winter. The concentration of the DTP was paddy fields > upland > forestland,rainfall period>non-rainfall period, and summer, autumn > spring > winter. The proportion of the TP in the PP was rainfall period>non-rainfall period. The concentration of the DTN in runoff was paddy field > upland > forestland, non-rainfall period > rainfall period, and decreased in the order of summer, autumn, spring, and winter. The concentration of the OM-N was paddy field > forestland> upland. The proportion of the DTN in the form of NH4-N was paddy field >upland > forestland, while that of NO3-N was upland > forestland > paddy field. |
| |
| Keywords: | runoff N and P chemical form seasonal variation |
|
| 点击此处可从《现代农业科技》浏览原始摘要信息 |
| 点击此处可从《现代农业科技》下载免费的PDF全文 |
|
