A modified version of P index was used to assess P loss risk and identify critical source areas in Chaohu watershed at a regional scale.
以巢湖流域为研究区，尝试采用改进的磷指数法在较大的流域尺度开展非点源磷流失风险评价及关键源区识别。
The system is heavily reliant on the availability of sunlight, and for critical tasks or areas a back-up artificial light source is required.
此系统对阳光有很强的依赖性，对于一些极端的工程或地区，需备有备用人工光源。
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