黄土高原南部旱作水分产量潜势计算模型及其参数修正

Mathematical model of water yield potential of dryland crops on South Loess Plateau and its parameters revision.

建立了旱作水分产量潜势计算模型 ,并对模型中的主要参数 (光能利用率、作物产量反应系数和作物系数等 )进行了修正 ,同时提出作物耗水量和水分订正系数等的估算方法 .冬小麦水分产量潜势为 530 0～ 630 0 kg· hm- 2 ,春玉米为 770 0～ 90 0 0 kg·hm- 2 .此外 ,本文还对农田水分条件进行了评价 ,指出黄土高原南部的东部地区水分条件较差 ,有较大的灌溉增产潜力 .

A mathematical model for calculating the water yield potential of dryland crops is established, and its main parameters are revised.The methods for calculating crop water consumption and water revision coefficient are also put forward.Based on the calculation, the water yield potential of winter wheat is 5300～6300 kg·hm -2 and that of spring maize is 7700～9000 kg·hm -2 .In addition, the water condition of dryland is evaluated,which indicates that the east region of south loess plateau has a worse water condition and a greater yield increase potential through irrigation.