| 李久生,陈磊,栗岩峰.地下滴灌灌水器堵塞特性田间评估[J].水利学报,2008,39(10): |
| 地下滴灌灌水器堵塞特性田间评估 |
| Field evaluation of emitter clogging in subsurface drip irrigation system |
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| DOI： |
| 中文关键词: 地下滴灌 灌水器 流量 堵塞 均匀性 田间评估 |
| 英文关键词: subsurface drip irrigation emitters discharge clogging uniformity field evaluation |
| 基金项目: |
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| 中文摘要: |
| 以运行2年的日光温室番茄地下滴灌系统为对象，通过对灌水器流量进行测试，分析了滴灌带埋深、施肥次数、施肥量和土壤层状结构等对灌水器堵塞程度及灌水均匀性的影响。滴灌系统包括滴灌带埋深为0、15和30cm的33个小区，2年累计施肥次数的变化范围为0～19，累计施尿素量变化范围为0～1.023kg/hm2。结果表明，运行2年后地表和地下滴灌灌水器发生了轻微堵塞，其中流量降低超过25%的灌水器占2.7%，完全堵塞的灌水器占2.1%；施肥次数、施肥量和土壤层状结构对堵塞的发生没有明显影响，地表滴灌比地下滴灌堵塞略为严 |
| 英文摘要: |
| Field evaluations were conducted for the two year subsurface drip irrigation installations in a solar heated greenhouse for tomato to investigate the influence of lateral depth, total number of fertigation events, fertilizer applied and soil layering on emitter clogging. The results demonstrated that 2.7% of the emitters can be declared to be clogged with discharge reduced more than 25%, and 2.1% of the emitters were completely clogged. No significant influence of total number of fertigation events, fertilizer applied and soil layering on emitter clogging was observed, but a slightly greater discharge reduction was found for surface drip irrigation plots than for subsurface drip irrigation plots. No emitter clogging caused by root intrusion was detected. An investigation on the distributions of clogged emitters in the systems revealed that most clogged emitters located at the terminals of the laterals. The coefficient of variation of emitter discharge(CV) was related to discharge reduction percentage(Rq)to quantitatively evaluate the effects of emitter clogging on the uniformity of water application, showing that CVincreased linearly with an increasing Rq. |
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