In the past 30 years, the measured annual river flow of the Yellow River has declined significantly. After adding the diverted water back to get the 'natural' annual river flow, the tendency of decrease can still be seen. This indicates that the river flow renewability of the Yellow River has changed. The river flow renewability is indexed as the ratio of annual 'natural' river flow to annual precipitation over a river drainage basin, where the 'natural' river flow is the measured annual river flow plus the annual 'net' water diversion from the river. By using this index, based on the data from the drainage area between Hekouzhen and Longmen stations on the middle Yellow River, a study has been made of the river flow renewability of the Yellow River in the changing environment of the past 50 years. The river flow renewability index (I-rr) in the drainage area between Hekouzhen and Longmen in the middle Yellow River basin has been found to decline significantly with time. In the meantime, annual precipitation decreased, annual air temperature increased, but the area of water and soil conservation measures has been increased. It has been found that I-rr is positively correlated with the areal averaged annual precipitation, but negatively correlated with annual air temperature. There is close, negative correlation between I-rr and the area of water and soil conservation measures including land terracing, tree and grass planting and checkdam building, implying that water and soil conservation measures have reduced the river flow renewability. Copyright (c) 2005 John Wiley & Sons, Ltd.
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机译：在过去的30年中，黄河的实测年河流流量已大大下降。将分流的水加回去以得到“自然”的年度河流量后，仍然可以看到下降的趋势。这表明黄河的河水可再生性发生了变化。河流流量的可更新性是以河流流域内年度“自然”河流流量与年降水量之比的指数表示的，其中“天然”河流流量是测得的年度河流流量加上每年从河流中“净”引水的流量。利用该指标，基于黄河中游河口镇与龙门站之间流域的数据，对近50年环境变化中黄河的河道可再生性进行了研究。研究发现，黄河中游河口镇与龙门之间流域的河水更新指数（I-rr）随时间显着下降。同时，年降水量减少，年气温升高，但水土保持措施面积增加。已经发现，I-rr与区域平均年降水量呈正相关，而与年气温呈负相关。 I-rr与水土保持措施的面积（包括土地梯田，林木种植和防洪堤建设）之间存在密切的负相关性，这意味着水土保持措施降低了河流的可再生性。版权所有（c）2005 John Wiley＆Sons，Ltd.
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