黄土塬区旱作农田高生产力的水分环境效应与产量波动性

以长武生态站水肥产量效应的长期定位试验资料为基础，结合模型预测的分析方法，揭示出黄土高原旱作塬区高产农田的水分环境效应在于过度消耗土壤水库，降低土壤含水量，使作物生长转而过度依靠年度降水，出现年际产量的高波动性。指出旱作高产高波动性具有可持续性，它是当前旱作农业的基本特点。

Effect of Water Environment and fluctuation with Higher Productivity in Table Dryland of Loess Plateau

Based on data of the long-term position experiments with the relation of water-fertilizer-yield at Changwu agro-ecological station, the effect of water environment with higher productivity in dryland of Loess Plateau is realized by the predicting method using model. The results will decrease soil water content and lead to a worse living condition to crop. Crop growth will depend on the rainfall only in this year mainly. The annual yield of crop appears higher fluctuation than that of lower productivity. At the same time, the higher fluctuation of higher yield is considered to be sustainable.