草业学报2011，Vol.20Issue(3)：10-19,10.
宁南旱地草粮轮作田土壤水可持续利用模拟研究
A simulation study on the sustainable use of soil water in dry land for alfalfa-crop rotation systems in the semiarid region of southern Ningxia
摘要
Abstract
Restoration of soil water in alfalfa-crop land was simulated in the hilly-arid region of southern Ningxia by a combination of survey and simulation methods. Simulated vertical distribution of soil water in different soil layers was consistent with observations and a good agreement was found between the simulated and observed soil moisture grades in different soil layers. A similar trend (higher speed at the earlier stage and lower speed at the later stage) was found in the process of forming and eliminating the soil desiccation layer. It was difficult for the restoration of soil water in 8-10 m soil. Therefore, soil moisture in this soil layer should not be lower than D grade, i.e. soil water content should not be less than 8.5％ during the cultivation process of alfalfa. For the sustainable development of agricultural production, the appropriate alfalfa stand age was 6-8 years; the optimum subsequent cropping system to recover soil water was potato/potato/spring-wheat; and the appropriate cultivation years of this subsequent copping system was 16-20 years before alfalfa was replanted again.关键词
土壤水分恢复/草粮轮作/半干旱区/EPIC模型Key words
soil water restoration/ alfalfa-crop rotation/ semi-arid region/ EPIC model分类
农业科技引用本文复制引用
王学春,李军,王美艳,方新宇..宁南旱地草粮轮作田土壤水可持续利用模拟研究[J].草业学报,2011,20(3):10-19,10.基金项目
国家自然科学基金项目(30771280)和黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10501-180)资助. （30771280）
